作者： Hu, Nan;Chen, Siyu;Lang, Tao;Zhang, Hui;Chen, Wei;...

期刊： Journal of Environmental Radioactivity,2021年227:106468 ISSN：0265-931X

通讯作者： Ding, Dexing

作者机构： [Chen, Wei; Zhang, Hui; Hu, Nan; Chen, Siyu; Ding, Dexing; Lang, Tao] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.;[Li, Guangyue; Ding, Dexing] Hunan Prov Key Lab Green Dev Technol Extremely Lo, Hengyang 421001, Hunan, Peoples R China.

通讯机构： [Ding, Dexing] U;Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.

关键词： Biochemistry;Bioremediation;Chelation;Constrained optimization;Contamination;Heavy metals;Radioisotopes;Soils;Chelating agent;Constrained optimi-zation problems;Constraint conditions;Contaminated soils;Ethylene diamine;Phytoremediation;Pot experiment;Toxic heavy metals;Soil pollution;chelating agent;citric acid;radium 226;s,s ethylenediamine disuccinic acid;succinic acid;thorium 232;unclassified drug;uranium 238;chelating agent;bioaccumulation;chelating agent;citric acid;contaminated land;heavy metal;phytoremediation;radionuclide;soil pollution;uranium isotope;Article;Macleaya cordata;nonhuman;perennial plant;phytoremediation;radioactive contamination;soil pollution;bioremediation;metabolism;radiation monitoring;soil;soil pollutant;Biodegradation, Environmental;Chelating Agents;Radiation Monitoring;Soil;Soil Pollutants, Radioactive

摘要： A chelating agent in an adequate dose used to enhance phytoremediation of radionuclide-contaminated soil should not inhibit the growth of the plant. If this constraint condition is satisfied, the total bioaccumulation amount (TBA) of radionuclide by the plant can be maximized. This is a constrained optimization problem to determine the adequate dose of the chelating agent for phytoremediation of radionuclide-contaminated soil. In this research, an adequate dose of a chelating agent for phytoremediation of radionuclide-contaminated soil was determined by a novel approach using pot experiments. The proposed approach was applied to specify the adequate doses of citric acid (CA) and S,S-ethylenediamine disuccinic acid (EDDS) for phytoremediation of uranium contaminated soil by M. Cordata. By using this method, the adequate doses of CA and EDDS for phytoremediation of 238U, 232Th and 226Ra contaminated soils by M. cordata were measures as 10.0 and 5.0 mmol kg−1, respectively. The results showed that the approach could be used to establish the adequate dose of a chelating agent for phytoremediation of radionuclide or other toxic heavy metal contaminated soil by a plant. © 2020 Elsevier Ltd

语种： 英文

作者： Dai, Zhongran;Sun, Yusu;Zhang, Hui;Ding, Dexin*;Li, Le

期刊： Chemosphere,2020年254(Sep.):126671 ISSN：0045-6535

通讯作者： Ding, Dexin

作者机构： [Ding, Dexin; Zhang, Hui; Li, Le; Dai, Zhongran; Sun, Yusu] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.

通讯机构： [Ding, Dexin] U;Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.

关键词： Uranium;Removal;Photoreduction;Wastewater

摘要： Efficient elimination of U(VI) from uranium wastewater is an urgent task for sustainable nuclear energy and environmental protection. In this study, magnetic graphene oxide decorated graphitic carbon nitride (mGO/g-C3N4) nanocomposite was prepared and used for photocatalytic reduction of U(VI) in wastewater under visible LED light irradiation for the first time. The batch experiments indicated that the mGO/g-C3N4 (mGCN) nanocomposite could efficiently reduce U(VI) under visible LED light, and a high U(VI) extraction capacity of 2880.6 mg/g was obtained with an extraction efficiency of 96.02%. The transmission electron microscopy (TEM) elemental mapping, X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) analyses demonstrated that the soluble U(VI) was immobilized by transforming it to metastudtite ((UO2)O-2 center dot 2H(2)O) by mGCN nanocomposite under visible LED light irradiation. This work indicated that the mGCN is a promising visible light catalyst for treatment of uranium wastewater. (C) 2020 Elsevier Ltd. All rights reserved.

语种： 英文

作者： Dai, Zhongran;Sun, Yusu;Zhang, Hui;Ding, Dexin*;Li, Le

期刊： Journal of Chemical and Engineering Data,2019年64(12):5797-5805 ISSN：0021-9568

通讯作者： Ding, Dexin

作者机构： [Ding, Dexin; Zhang, Hui; Li, Le; Dai, Zhongran; Sun, Yusu] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.

通讯机构： [Ding, Dexin] U;Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.

关键词： Chemicals removal (water treatment);Graphene;High resolution transmission electron microscopy;Magnetism;Potable water;Radioactive wastes;Radioactivity;Scanning electron microscopy;X ray photoelectron spectroscopy;Adsorption capacities;Fourier transform infrared;In-situ polymerization;Maximum permissible concentration;Radioactive wastewater;Thermodynamic parameter;Vibrating sample magnetometer;World Health Organization;Uranium compounds

摘要： Highly efficient removal of U(VI) from mine radioactive wastewater has received a lot of attention. Herein, the polyamidoxime/polyethyleneimine magnetic graphene oxide (mGO-PP) adsorbent was successfully prepared by in situ polymerization of acrylonitrile on magnetic GO (mGO) covalently modified with polyethylenimine (PEI). The mGO-PP was characterized by Fourier transform infrared (FT-IR), scanning electron microscopy, transmission electron microscopy, vibrating sample magnetometer, and X-ray photoelectron spectroscopy (XPS). The maximum adsorption capacity of mGO-PP toward U(VI) was 606.06 mg/g at 298 K and pH 6.0. The removal of U(VI) by mGO-PP for U(VI) was a monolayer chemisorption based on the study of the batch experiment. The calculated thermodynamic parameters indicated that the removal of U(VI) by mGO-PP was a spontaneous and endothermic process. The adsorption mechanism of mGO-PP toward U(VI) was explored by FT-IR and XPS analyses. Furthermore, the removal rate of U(VI) by mGO-PP is 93.68% and the Kd value for U(VI) is 444.73 L/g in actual mine radioactive wastewater, and the residual U(VI) concentration (6.37 μg/L) in wastewater was lower than the maximum permissible concentration of uranium in drinking water (30 μg/L) (World Health Organization). This indicated that the mGO-PP composite is a promising adsorbent for efficient removal of U(VI) from practical mine radioactive wastewater. Copyright © 2019 American Chemical Society.

语种： 英文

作者： 王聂颖;张辉;隋阳;陈约余;胡南;...

期刊： 中国环境科学,2019年39(5):2161-2169 ISSN：1000-6923

通讯作者： Ding, D.-X.

作者机构： 南华大学核科学技术学院;南华大学铀矿冶生物技术国防重点学科实验室极贫铀资源绿色开发技术湖南省重点实验室;[胡南; 隋阳; 陈约余; 戴仲然; 丁德馨; 王聂颖; 张辉] 南华大学

通讯机构： Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, Hunan Province Key Laboratory of Green Development Technology for Extremely Low Grade Uranium Resources, University of South China, Hengyang, China

关键词： 铀污染地表水;生物矿化;植酸盐水解

摘要： 从广东某铀尾矿库水下沉积物中分离筛选出了一株能水解植酸盐的真菌M5-1,对其菌落形态、ITS序列、最适生长pH值、对铀的耐受性及其水解植酸盐的效果进行了分析,随后对M5-1生物矿化铀过程中pH 值、正磷酸盐浓度、铀浓度、铀去除率的变化进行了监测,对矿化产物的主要元素和矿物组成进行了分析.证实了真菌M5-1为Aspergillus tubingensis(MH978623),其最适生长pH 值范围为6~7,对铀(~0.84mmol/L)具有较强的耐受性;Aspergillus tubingensis介导植酸盐水解促进U(VI)-PO_4~(3-)矿化62d后,铀的去除率达95.2%;Aspergillus tubingensis介导U(VI)-PO_4~(3-)矿化过程中可能形成了难溶的氢铀云母和变钠铀云母矿物.结果表明,Aspergillus tubingensis 能有效水解植酸盐释放可溶性正磷酸盐,从而促进U(VI)-PO_4~(3-)矿化.研究结果为采用Aspergillus tubingensis介导植酸盐水解原位修复铀污染地表水提供了试验依据.

语种： 中文

作者： Fu, Haiying;Ding, Dexin*;Sui, Yang;Zhang, Hui;Hu, Nan;...

期刊： Environmental Science and Pollution Research,2019年26(36):37125-37136 ISSN：0944-1344

通讯作者： Ding, Dexin

作者机构： [Ding, Dexin; Zhang, Hui; Ye, Yongjun; Dai, Zhongran; Li, Guangyue; Li, Feng; Hu, Nan; Wang, Yongdong; Fu, Haiying] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.;[Ding, Dexin; Zhang, Hui; Ye, Yongjun; Dai, Zhongran; Li, Guangyue; Li, Feng; Hu, Nan; Wang, Yongdong; Fu, Haiying] Hunan Prov Key Lab Green Dev Technol Extremely Lo, Hengyang 421001, Peoples R China.;[Sui, Yang] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.

通讯机构： [Ding, Dexin] U;[Ding, Dexin] H;Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.;Hunan Prov Key Lab Green Dev Technol Extremely Lo, Hengyang 421001, Peoples R China.

关键词： Column experiment;Competitive adsorption;Hydrus-1D;Overshoot;Uranium migration

摘要： Uranium-contaminated wastewater associated with uranium (U) mining and processing inevitably releases into soil environment. In order to assess the risk of U wastewater contamination to groundwater through percolation, U adsorption and transport behavior in a typical red soil in South China was investigated through batch adsorption and column experiments, and initial pH and carbonate concentration were considered of the high-sulfate background electrolyte solution. Results demonstrated that U adsorption isotherms followed the Freundlich model. The adsorption of U to red soil significantly decreased with the decrease of the initial pH from 7 to 3 in the absence of carbonate, protonation-deprotonation reactions controlled the adsorption capacity, and lnCs had a linear relationship with the equilibrium pH (pHeq). In the presence of carbonate, the adsorption was much greater than that in the absence of carbonate owing to the pHeq values buffered by carbonate, but the adsorption decreased with the increase of the carbonate concentration from 3.5 to 6.5 mM. Additionally, the breakthrough curves (BTCs) obtained by column experiments showed that large numbers of H(+) and CO3(2-) competed with the U species for adsorption sites, which resulted in BTC overshoot (C/C0 > 1). Numerical simulation results indicated that the BTCs at initial pH 4 and 5 could be well simulated by two-site chemical non-equilibrium model (CNEM), whereas the BTCs of varying initial carbonate concentrations were suitable for one-site CNEM. The fractions of equilibrium adsorption sites (f) seemed to correlate with the fractions of positively charged complexes of U species in solution. The values of partition coefficients (kd(')) were lower than those measured in batch adsorption experiments, but they had the same variation trend. The values of first-order rate coefficient (omega) for all BTCs were low, representing a relatively slow equilibrium between U in the liquid and solid phases. In conclusion, the mobility of U in the red soil increased with the decrease of the initial pH and with the increase of the initial carbonate concentrations.

语种： 英文

作者： Xue, Jin-Hua;Zhang, Hui;Ding, D. X.*;Hu, Nan;Wang, Yong-Dong;...

期刊： Industrial & Engineering Chemistry Research,2019年58(10):4074-4083 ISSN：0888-5885

通讯作者： Ding, D. X.;Wang, Yong-Sheng

作者机构： [Zhang, Hui; Hu, Nan; Ding, D. X.; Xue, Jin-Hua; Wang, Yong-Dong] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Hunan, Peoples R China.;[Xue, Jin-Hua; Wang, Yong-Sheng] Univ South China, Coll Publ Hlth, Hengyang 421001, Hunan, Peoples R China.

通讯机构： [Ding, D. X.; Wang, Yong-Sheng] U;Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Hunan, Peoples R China.;Univ South China, Coll Publ Hlth, Hengyang 421001, Hunan, Peoples R China.

摘要： Linear β-cyclodextrin polymer functionalized multiwalled carbon nanotubes (MWCNTs-CDP) were synthesized and employed as a novel nanoadsorbent to remove uranyl ions in wastewater solutions. The characterization of MWCNTs-CDP, with Fourier transform infrared (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and Brunauer-Emmett-Teller (BET), suggested that the CDP was successfully modified on the MWCNTs surfaces. The removal efficiency of uranyl ions in aqueous solution by MWCNTs-CDP was investigated via varying various experimental conditions. We found that the removal of uranyl ions correlated with both pH and temperature, and the optimum pH and temperature were 6.0 and 323.15 K, respectively. The adsorption of uranyl ions was very fleet at the initial 1 h and then reached the adsorption equilibrium after 3 h. The data from the adsorption dynamics experiment could be commendably fitted by the pseudo-second-order model (R2 > 0.982), suggesting that chemisorption might be the rate-controlling mechanism. The Langmuir model (R2 > 0.995) manifested that the maximum adsorption capacity of uranyl ions on MWCNTs-CDP was boosted from 66.16 to 89.54 mg g-1 upon the change of temperature from 293.15 to 323.15 K. This result was better than that of some reported adsorbents. The thermodynamics analysis proved that the adsorption of uranyl ions on MWCNTs-CDP was a spontaneous process and an endothermic one. The adsorption mechanism of uranyl ions on MWCNTs-CDP was verified to be dominated by inner-sphere surface complexation. Our results indicated that MWCNTs-CDP can be utilized as a novel nanoadsorbent for highly effective removal of uranyl ions in actual uranyl-bearing effluents. © 2019 American Chemical Society.

语种： 英文

作者： Zhao, Weichao;Hu, Nan;Ding, Dexin*;Long, Dingxin;Li, Sheng;...

期刊： Environmental Science and Pollution Research,2019年26(4):3869-3881 ISSN：0944-1344

通讯作者： Ding, Dexin

作者机构： [Zhao, Weichao] Univ South China, Sch Environm Protect & Safety Engn, Hengyang 421001, Peoples R China.;[Ding, Dexin; Zhang, Hui; Li, Sheng; Li, Guangyue; Hu, Nan] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.;[Long, Dingxin; Zhao, Weichao] Univ South China, Sch Publ Hlth, Hengyang 421001, Peoples R China.

通讯机构： [Ding, Dexin] U;Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.

关键词： Apoptosis;Developmental toxicity;Low-dose gamma-ray irradiation;Signaling pathway;Zebrafish embryos

摘要： In this paper, the developmental toxicity and apoptosis in zebrafish (Danio rerio) embryos induced by 0.01, 0.05, and 0.10-Gy gamma-ray irradiation were investigated and verified by single cell gel electrophoresis, acridine orange staining, flow cytometry, transmission electron microscopy, digital gene expression sequencing, and Western blot analysis. DNA damage, deformity rates, and apoptosis of zebrafish embryos were found to increase significantly with the increase of irradiation dose, and survival and hatching rates significantly decreased when the irradiation dose exceeds 0.10 and 0.05 Gy, respectively. Exposure to 0.10-Gy gamma-ray irradiation resulted in the swelling of cell mitochondria of zebrafish embryos and changes in their intracellular vacuoles. mRNA and protein expression levels of Shh (sonic hedgehog 19 KDa) and Smo (smoothened 86 KDa) of Hh signaling pathway associated with the development of early embryos significantly increased with the increase of irradiation dose. Expression of the AKT (56 KDa) and PiK3r3 (55 KDa) genes, which are anti-apoptotic and involved with the PI3K/Akt signaling pathway, significantly decreased, while expression of the bada gene, which is pro-apoptotic, significantly increased. The results show that gamma-ray irradiations of 0.01 and 0.05 Gy can induce developmental toxicity and apoptosis in zebrafish embryos via Hh and PI3K/Akt signaling pathways, respectively.

语种： 英文

作者： Sha, Yin-hua;Hu, Nan;Wang, Yong-dong;Chen, Si-yu;Zou, Chao;...

期刊： Journal of Environmental Radioactivity,2019年208-209:106036 ISSN：0265-931X

通讯作者： Ding, De-xin

作者机构： [Chen, Si-yu; Dai, Zhong-ran; Zhang, Hui; Hu, Nan; Sha, Yin-hua; Ding, De-xin] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Henyang 421001, Peoples R China.;[Zou, Chao; Wang, Yong-dong] Univ South China, Hunan Prov Key Lab Green Dev Technol Exetremely L, Henyang 421001, Peoples R China.;[Ding, De-xin] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, 28 West Changsheng Rd, Hengyang 421001, Hunan, Peoples R China.

通讯机构： [Ding, De-xin] U;Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, 28 West Changsheng Rd, Hengyang 421001, Hunan, Peoples R China.

关键词： Bacteria;Bamboo;Bioaccumulation;Biochemistry;Bioremediation;Contamination;Efficiency;Enzyme activity;Oxalic acid;Soil moisture;Uranium;Contaminated soils;Greenhouse experiments;Microbial community structures;Phytoremediation;Plant communities;Plant growth promoting rhizobacteria;Remediation efficiency;Uptake and accumulations;Soil pollution;carboxylic acid;uranium;uranium;bacterium;bioaccumulation;biomass;bioremediation;community structure;microbial community;phytoremediation;plant community;rhizosphere;soil microorganism;soil pollution;soil remediation;uranium;Article;Bamboo willow;bioaccumulation;biomass;Burkholderia;chelation;community structure;controlled study;enzyme activity;Leptolyngbya;Macleaya cordata;microbial community;nonhuman;Paspalum;Paspalum scrobisculatum;phytoremediation;plant community;rhizosphere;soil pollution;willow;bioremediation;metabolism;soil pollutant;Bacteria (microorganisms);Burkholderia;Leptolyngbya;Macleaya cordata;Paspalum scrobiculatum;Rhizobiales;Salix;Salix sp.;Biodegradation, Environmental;Soil Pollutants, Radioactive;Uranium

摘要： In order to develop an artificially constructed plant community plot for the enhanced phytoremediation of uranium contaminated soils, three uranium accumulators including Bamboo-willow (Salix sp.), Paspalum scrobiculatum linn and Macleaya cordata were used to construct four artificial plant community plots, and greenhouse experiments were conducted to investigate the bioaccumulation of uranium by the plants and the organic acid content, enzyme activity, and the change of microbial community structure in their rhizosphere soils. The transfer factor (TF) and the total bioaccumulation amount (TBA) of uranium were used to describe remediation efficiencies in this paper. It was found that their remediation efficiencies were in the order Bamboo-willow (Salix sp.)-Paspalum scrobiculatum linn-Macleaya cordata > Bamboo-willow (Salix sp.)-Macleaya cordata > Paspalum scrobiculatum linn-Macleaya cordata > Bamboo-willow (Salix sp.)-Paspalum scrobiculatum linn. The bioaccumulation amount of uranium by each plant in the Bamboo-willow (Salix sp.)-Paspalum scrobiculatum linn-Macleaya cordata community plot was significantly (P < 0.05) higher than that by its single population, the bioaccumulation amounts of uranium by Bamboo-willow (Salix sp.), Paspalum scrobiculatum linn and Macleaya cordata were 0.29, 0.32 and 2.19 mg/plant, respectively, and they were increased by 31.82%, 77.78% and 146.07%, respectively, and the transfer efficiencies by the plants were increased by 150%, 110% and 52.17%, respectively. The interaction between the plants' roots and the microorganisms in the rhizosphere soil of the Bamboo-willow (Salix sp.)-Paspalum scrobiculatum linn-Macleaya cordata community plot resulted in the high content of organic acids such as oxalic acid in the rhizosphere soil of the plant community plot, which was significantly (P < 0.05) higher than that of its single population. The chelation of the organic acids with uranium led to an increase in the proportion of exchangeable uranium in soil solution. In addition, Burkholderia, which is an iron-producing carrier bacterium and can increase the uptake and accumulation of uranium by plants, and Leptolyngbya, which is a plant growth promoting rhizobacteria and can increase the biomass of plants, emerged in the rhizosphere soil of the plant community plot. These may be the mechanisms by which the phytoremediation of the uranium contaminated soils was enhanced by the plant community plot. © 2019 Elsevier Ltd

语种： 英文

作者： Li, L.;Hu, N.;Dai, Z.;Zhang, H.;Ding, D.*;...

期刊： International Journal of Environmental Science and Technology,2019年16(11):7523-7534 ISSN：1735-1472

通讯作者： Ding, D.

作者机构： [Lu, Wei; Li, L.] Univ South China, Sch Publ Hlth, Hengyang 421001, Peoples R China.;[Lu, Wei; Hu, N.; Zhang, H.; Dai, Z.; Li, L.; Ding, D.] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.

通讯机构： [Ding, D.] U;Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.

关键词： Adsorption;Aspergillus;Biosorption;Catalyst selectivity;Heavy metals;Metal ions;Systems (metallurgical);Uranium dioxide;Aspergillus niger;Binary systems;Biosorption capacity;Ethylene diamine;Multi-metals;Selective adsorption;Selective removal;Selectivity coefficient;Chemicals removal (water treatment);aqueous solution;fungus;organic compound;pollutant removal;uranium;Aspergillus niger

摘要： The ethylenediamine-modified Aspergillus niger (EMAN) and amidoxime-modified A. niger (AMAN) had been successfully prepared and then characterized by means of FTIR and SEM–EDX. The selective adsorption features of raw A. niger (RAN), EMAN, and AMAN for UO2 2+ over other coexistent heavy metal ions, such as Fe3+, Pb2+, Cu2+, Zn2+, Cd2+, and Co2+ had been investigated in a multi-metal system and a binary system. At the optimum pH which was 5, the orders of selectivity biosorption of EMAN and AMAN in a multi-metal system were UO2 2+ ≫ Fe3+ &gt; Pb2+ &gt; Cu2+ &gt; Zn2+ &gt; Cd2+ &gt; Co2+ and UO2 2+≫ Fe3+ &gt; Cu2+ &gt; Pb2+ &gt; Zn2+ &gt; Co2+ &gt; Cd2+, respectively. In a binary system, Fe3+, Pb2+, and Cu2+ suppressed the biosorption capacity of EMAN and AMAN for U(VI), while there was very slight interference from Zn2+, Co2+, and Cd2+ with the biosorption for U(VI). From the selectivity coefficients in both multi-metal and binary system, EMAN and AMAN prefer to uranyl ion than other metal ions, which were much better than RAN. As expected, the results indicated that the modified A. niger could be the effective and selective biosorbent for uranyl ion. © 2018, Islamic Azad University (IAU).

语种： 英文

作者： Zou Chao;Sha Yin-hua;Ding De-xin;Li Guang-yue;Cui Yue-ting;...

期刊： Chemosphere,2019年224(Jun.):316-323 ISSN：0045-6535

通讯作者： Wang Yong-dong

作者机构： [Li Feng; Zou Chao; Dai Zhong-ran; Ding De-xin; Li Guang-yue; Hu Nan; Wang Yong-dong; Cui Yue-ting; Sun Jing; Sha Yin-hua; Zhang Hui] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Heng Yang 421001, Hunan, Peoples R China.

通讯机构： [Wang Yong-dong] U;Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Heng Yang 421001, Hunan, Peoples R China.

关键词： Aspergillus niger;Combined remediation system;Phytoremediation;Syngonium podophyllum;Uranium stress

摘要： Aspergillus niger (A. niger) and Syngonium podophyllum (S. podophyllum) have been used for wastewater treatment, and have exhibited a promising application in recent years. To determine the effects of A. niger on uranium enrichment and uranium stress antagonism of S. podophyllum, the S. podophyllum-A. niger combined system was established, and hydroponic remediation experiments were carried out with uranium-containing wastewater. The results revealed that the bioaugmentation of A. niger could increase the biomass of S. podophyllum by 5-7%, reverse the process of U(VI) reduction induced by S. podophyllum, and increase the bioconcentration factor (BCF) and translocation factor (TF) of S. podophyllum to uranium by 35-41 and 0.01-0.06, respectively, thereby improving the reduction of uranium in wastewater. Moreover, A. niger could promote the cell wall immobilization and the subcellular compartmentalization of uranium in the root of S. podophyllum, reduce the phytotoxicity of uranium entering root cells, and inhibit the calcium efflux from root cells, thereby withdrawing the stress of uranium on S. podophyllum. (C) 2019 Published by Elsevier Ltd.

语种： 英文

作者： Dai, Zhongran;Sun, Yusu;Zhang, Hui;Ding, Dexin*;Li, Le

期刊： Industrial & Engineering Chemistry Research,2019年58(41):19280-19291 ISSN：0888-5885

通讯作者： Ding, Dexin

作者机构： [Dai, Zhongran; Sun, Yusu; Zhang, Hui; Ding, Dexin; Li, Le] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China

通讯机构： [Ding, Dexin] U;Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.

会议名称： 4th North American Symposium on Chemical Reaction Engineering (NASCRE)

会议时间： MAR, 2019

会议地点： Houston, TX

摘要： Efficient removal of U(VT) from mine radioactive wastewater is important for environmental remediation and radiation protection. In this work, a new series of polyamidoxime/polydopamine-decorated graphene oxide (GO/PDA/PAO) composites were obtained by one-pot synthesis and used for the removal of U(VI) from mine radioactive wastewater. The as-synthesized GO/PDA/PAO composites (GO/PDA/PAO-0.2, GO/PDA/PAO-0.5, and GO/PDA/PAO-1) were examined by transmission electron microscopy, Fourier transform infrared (FT-IR), and X-ray photoelectron spectroscopy (XPS). The effects of pH, ionic strength, contact time, initial U(VI) concentration, and temperature on the adsorption behavior of U(VI) by GO/PDA/PAO were investigated. The maximum adsorption capacity of GO/PDA/PAO-0.2 was 502.5 m g/g at pH 6.0 and 298 K. The adsorption kinetics and isotherms can be well illustrated by the pseudo-second-order kinetics model and Langmuir isotherm model. The thermodynamic study indicated that the removal of U(VI) by GO/PDA/PAO-0.2 was an endothermic and spontaneous process. The interactions between GO/PDA/PAO-0.2 and U(VI) were explained based on the FT-IR and XPS analyses. Furthermore, GO/PDA/PAO was applied for U(VI) removal from mine radioactive wastewater. The concentration of U(Vl) in the wastewater can be reduced to 7.28 /mu g/L, which is below the allowable uranium concentration for drinking water stipulated in the standard by the World Health Organization (30 mu g/L).

语种： 英文

作者： Hu, Nan;Lang, Tao;Ding, Dexin*;Hu, Jingsong;Li, Changwu;...

期刊： Journal of Environmental Radioactivity,2019年199-200:58-65 ISSN：0265-931X

通讯作者： Ding, Dexin

作者机构： [Ding, Dexin; Zhang, Hui; Li, Changwu; Li, Guangyue; Hu, Nan; Hu, Jingsong] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, 28 West Changsheng Rd, Hengyang 421001, Hunan, Peoples R China.;[Lang, Tao] Jiangxi Nucl Ind Geol Bur, Brigade 264, Ganzhou 341000, Jiangxi, Peoples R China.

通讯机构： [Ding, Dexin] U;Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, 28 West Changsheng Rd, Hengyang 421001, Hunan, Peoples R China.

关键词： Antioxidants;Bioaccumulation;Biochemistry;Bioremediation;Chelation;Contamination;Enzymes;Oxalic acid;Plants (botany);Soil moisture;Soil pollution control;Uranium;Antioxidant enzyme;Bio-concentration factors;Bioaccumulation factor;Chelates;Environmentally friendly alternatives;Hyperaccumulating plant;Macleaya cordata;Phytoremediation;Soil pollution;ascorbate peroxidase;catalase;chelate;citric acid;ethylenediamine;ethylenediamine disuccinic acid;oxalic acid;peroxidase;superoxide dismutase;transfer factor;unclassified drug;uranium;chelating agent;uranium;antioxidant;bioaccumulation;chelate;citric acid;concentration (composition);herb;hyperaccumulation;phytoremediation;soil pollution;solubilization;uranium;Article;bioaccumulation;biomass;concentration (parameter);controlled study;enzyme activity;greenhouse;leaf tissue;Macleaya cordata;oxidative stress;phytoavailability;phytoremediation;phytotoxicity;plant cell;shoot growth;soil acidity;soil pollution;solubilization;Viridiplantae;bioremediation;chemistry;metabolism;Papaveraceae;physiology;soil pollutant;Macleaya cordata;Biodegradation, Environmental;Chelating Agents;Papaveraceae;Soil Pollutants, Radioactive;Uranium

摘要： A greenhouse pot experiment was performed to investigate the enhancement of repeated applications of citric acid (CA), ethylenediamine disuccinic acid (EDDS), and Oxalic acid (OA) on phytoremediation of uranium (U) contaminated soil by Macleaya Cordata. The chelates followed the order CA &gt; EDDS &gt; OA in terms of the enhancement on uranium uptake by M. cordata. The repeated applications of the chelates were found to be more effective than the one time application at the equal dose as the U concentration of soil solution increased significantly from the 8th to 14th day. The repeated applications of 10 mmol kg -1 CA promoted the solubilization of U in the U-contaminated soil by significantly decreasing the pH of soil solution, achieved the maximum U concentration of soil solution (1463.6 µg L −1 ), bioconcentration factors (BCFs, 11.4), bioaccumulation factors (BAFs, 21.4) and transfer factors (TFs, 1.9), which were 215.2, 5.7, 30.6 and 16.3 times as compared with the control group, respectively. The three applied chelates significantly affected the activities of the antioxidant enzymes in the leaves. Repeated applications of CA further enhanced the activities of the antioxidant enzymes in the leaves of M. cordata as compared with the control, EDDS and OA, mitigated the oxidative stress induced by uranium and chelates, and maximized the enhancement on the uranium uptake, which will be beneficial for the enhancement on the phytoremediation of uranium contaminated soil by U hyperaccumulating plants. These results indicated that the phytoavailability of uranium in soil solution as well as the accumulation of U by M. cordata were both significantly increased after repeated applications of CA, and that the repeated applications of 10 mmol kg -1 CA increased the activities of the antioxidant enzymes and promoted U accumulation by M. cordata. The study provided an environmentally friendly alternative for the enhancement on the phytoremediation of uranium contaminated soil using M. cordata. © 2018 Elsevier Ltd

语种： 英文

作者： Dai, Zhongran;Zhang, Hui;Sui, Yang;Ding, Dexin*;Li, Le

期刊： Journal of Chemical and Engineering Data,2018年63(11):4215-4225 ISSN：0021-9568

通讯作者： Ding, Dexin

作者机构： [Ding, Dexin; Zhang, Hui; Li, Le; Dai, Zhongran] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.;[Sui, Yang] Univ South China, Sch Environm & Safety Engn, Hengyang 421001, Peoples R China.;[Sui, Yang] Fujian Fuqing Nucl Power Co Ltd, Fuqing 350300, Peoples R China.

通讯机构： [Ding, Dexin] U;Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.

关键词： Adsorption;Binding energy;Chemicals removal (water treatment);Extraction;Free radical polymerization;Graphene;Radioactive wastes;Radioactivity;Solutions;Uranium metallurgy;Adsorption equilibria;Adsorption kinetics and isotherm;Adsorption performance;Endothermic process;Pseudo second order;Radioactive wastewater;Reversible addition-fragmentation chain transfer polymerization;Thermodynamic parameter;Uranium compounds

摘要： In this work, the polyamidoxime functionalized magnetic graphene oxide (mGO-PAO) was prepared via the surface-initiated reversible addition-fragmentation chain transfer (RAFT) polymerization, characterized by TEM, FT-IR, VSM, and TGA techniques, and applied for the extraction of uranium(VI) from aqueous solutions in an ultrasonic field. The effects of pH, contact time, initial uranium(VI) concentration, temperature, and competitive ions on the adsorption of U(VI) were investigated. The adsorption speed of mGO-PAO for U(VI) was found to be 18 times faster in the ultrasonic field than in the shaking mode, and the adsorption equilibrium, to be reached within 2 min. When the U(VI) concentration was 10 mg/L, the temperature, 298 K, and pH, 6.0, the removal rate of U(VI) reached 98.24% with high selectivity. The adsorption kinetics and isotherm data were well described by the pseudo-second-order and Langmuir models, respectively. The thermodynamic parameters suggested that the adsorption of U(VI) was a typical spontaneous and endothermic process. XPS analysis suggested that the mGO-PAO bound the U(VI) through the η2-N,O binding mode. Moreover, the mGO-PAO exhibits excellent adsorption performance in actual radioactive wastewater with an assist of ultrasound. This work provides a new approach for highly effective extraction of U(VI) from the actual radioactive wastewater. © 2018 American Chemical Society.

语种： 英文

作者： 陈威;胡南;陈可;陈思羽;张辉;...

期刊： 原子能科学技术,2018年52(10):1748-1755 ISSN：1000-6931

通讯作者： Ding, Dexin(dingdxzzz@163.com)

作者机构： [陈威; 胡南; 陈可; 陈思羽; 张辉; 丁德馨] Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang;421001, China;Hunan Province Key Laboratory of Green Development Technology for Extremely Low Grade Uranium Resources, Hengyang;[陈威; 胡南; 陈可; 陈思羽; 张辉; 丁德馨] 421001, China <&wdkj&> Hunan Province Key Laboratory of Green Development Technology for Extremely Low Grade Uranium Resources, Hengyang;[陈威; 胡南; 陈可; 陈思羽; 张辉; 丁德馨] 421001, China

通讯机构： Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang, China

关键词： 植物修复;铀;博落回;竹柳;间作

摘要： 采用铀富集植物向日葵、博落回和竹柳进行单作与间作,开展铀污染土壤修复实验,研究了各植物富集铀的性能、根际土壤中微生物群落、有机酸含量以及铀的化学形态变化。结果表明,与单作相比,博落回和竹柳间作时,它们对铀的富集量分别提高了183.50%和24.93%,转运系数分别提高了120.31%和104.3%,修复效率最高。博落回和竹柳间作时,根际土壤中耐受菌Acidobacteria、促生菌Bradyrhizobium以及分泌有机酸真菌Aspergillus的比例显著升高,草酸和丙二酸的含量明显增加。Acidobacteria和Bradyrhizobium等细菌提高了植物对铀的耐受性能和富集性能,Aspergillus分泌的有机酸与铀形成螯合物,增加了土壤中可交换态铀的比例。这些可能是博落回和竹柳间作时修复效率显著高于两者单作时的主要机理。

语种： 中文

作者： 黄超;张辉;胡南;丁德馨;李殿鑫;...

期刊： 中国环境科学,2018年38(9):3391-3397 ISSN：1000-6923

通讯作者： Ding, D.-X.

作者机构： 南华大学,铀矿冶生物技术国防重点学科实验室,湖南 衡阳 421001;南华大学,极贫铀资源绿色开发技术湖南省重点实验室,湖南 衡阳 421001;[黄超; 张辉; 胡南; 丁德馨; 李殿鑫; 孙静] 南华大学, 铀矿冶生物技术国防重点学科实验室, 湖南, 衡阳, 421001 南华大学, 极贫铀资源绿色开发技术湖南省重点实验室, 湖南, 衡阳, 421001

通讯机构： Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang, China

关键词： β-甘油磷酸钠;含铀地下水;生物还原;生物矿化;原位固定

摘要： 利用微模型实验,研究β-甘油磷酸钠修复含铀地下水的效果,监测厌氧培养过程中硝酸盐、硫酸盐、磷酸盐、pH值和铀浓度的变化,分析沉积物中铀的化学形态以及U(IV)的比例.结果表明:厌氧培养25d后,β-甘油磷酸钠组和甘油组的铀浓度分别从2.96,2.99mg/L降低到0.030,0.044mg/L,达到了我国《铀矿冶辐射防护和环境保护规定(GB23727-2009)》规定的排放标准.β-甘油磷酸钠作为碳源和磷源能够降低沉积物中可交换态和碳酸盐结合态铀的比例,并能提高沉积物中铁锰氧化物结合态,有机结合态和残渣态铀的比例;厌氧培养25d后,β-甘油磷酸钠组沉积物中U(IV)的比例达到了91.79%,比甘油组提高了28.82%,厌氧培养45d后,β-甘油磷酸钠组沉积物中U(IV)的比例基本保持不变,而甘油组则下降了7.98%.β-甘油磷酸钠作为碳源和磷源,能够促进U(VI)的生物还原和矿化从而将铀原位固定.

语种： 中文

作者： 王芳;张辉;戴仲然;胡南;丁德馨;...

期刊： 环境科学学报,2018年38(9):3605-3613 ISSN：0253-2468

通讯作者： Ding, D.

作者机构： 南华大学铀矿冶生物技术国防重点学科实验室,衡阳421001;南华大学极贫铀资源绿色开发技术湖南省重点实验室,衡阳421001;[王芳; 张辉; 戴仲然; 胡南; 丁德馨; 李广悦] Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang, 421001, China<&wdkj&>Hunan Province Key Laboratory of Green Development Technology for Extremely Low Grade Uranium Resources, Hengyang, 421001, China

通讯机构： Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang, China

关键词： 磁性核壳复合材料;吸附

摘要： 通过化学合成法制备了磁性核壳CoFe_2O_4@SiO_2@PIL-AO复合材料,采用傅立叶变换红外光谱(FTIR)、扫描电镜(SEM)和X射线光电子能谱(XPS)对其进行了表征,研究了溶液pH、吸附时间、U(VI)初始浓度和温度等参数对U(VI)吸附性能的影响.实验结果表明:在c0 = 0.2 mg·L~(-1)、pH= 6.00±0.05、T = 298.15 K、m= 0.02 g和t = 8 h的条件下,CoFe_2O_4@SiO_2@PIL-AO对U(VI)的吸附作用最强,吸附率达到了97.54%;CoFe_2O_4@SiO_2@PIL-AO吸附U(VI)是一个自发进行的吸热反应,U(VI)吸附动力学符合准二级动力学模型,吸附等温线符合Freundlich模型;CoFe_2O_4@SiO_2@PIL-AO复合材料具有良好的可循环使用性,循环使用5次后它对U(VI)的吸附容量没有明显下降,可重复使用.

语种： 中文

作者： Tan, Yan;Li, Le;Zhang, Hui;Ding, Dexin*;Dai, Zhongran;...

期刊： Journal of Radioanalytical and Nuclear Chemistry,2018年317(2):811-824 ISSN：0236-5731

通讯作者： Ding, Dexin

作者机构： [Ding, Dexin; Tan, Yan] Cent S Univ, Sch Resources & Safety Engn, Changsha 410083, Hunan, Peoples R China.;[Ding, Dexin; Tan, Yan; Zhang, Hui; Liu, Jinquan; Li, Le; Dai, Zhongran; Hu, Nan; Xue, Jinhua; Wang, Yongdong] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.;[Tan, Yan; Liu, Jinquan; Li, Le; Xue, Jinhua] Univ South China, Sch Publ Hlth, Hengyang 421001, Peoples R China.

通讯机构： [Ding, Dexin] C;[Ding, Dexin] U;Cent S Univ, Sch Resources & Safety Engn, Changsha 410083, Hunan, Peoples R China.;Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.

关键词： activated carbon;thioacetamide;uranium;Article;chemical analysis;chemical reaction;correlation coefficient;energy dispersive X ray spectroscopy;Fourier transform infrared spectroscopy;Glycyrrhiza glabra;kinetics;polymerization;process optimization;radioactivity;temperature;thermodynamics;X ray photoemission spectroscopy;zeta potential

摘要： In this paper, cheap liquorice residue was used to prepare activated carbon (AC), thioacetamide (TAA) was used to modify the AC, and the adsorption experiments were conducted in the simulated acid radioactive wastewater with low uranium concentration to study the adsorption behavior and mechanism for uranium by TAA modified AC (TAA–AC). The removal efficiency by TAA–AC was 92.1–98.2% from the 1mgL−1 uranium solution at pH 2–6. The adsorption equilibrium data were well fitted by Dubinin–Radushkevich model, and the maximum adsorption capacity was estimated to be 340mgg−1. TAA–AC showed an enhanced selectivity for uranium in the presence of competitive ions. Furthermore, the adsorption experiments were conducted in the actual acid radioactive wastewater with low uranium concentration from an in situ leach uranium mine. The high adsorption rate (98.3%) and selectivity (Kd = 3.78×104mLg−1) for uranium were observed in the actual acid radioactive wastewater, and the adsorption rate was found to maintain 96.2% over six cycles of adsorption–desorption. © 2018, Akadémiai Kiadó, Budapest, Hungary.

语种： 英文

作者： Dai, Zhongran;Zhang, Hui;Sui, Yang;Ding, Dexin*;Hu, Nan;...

期刊： Journal of Radioanalytical and Nuclear Chemistry,2018年316(1):369-382 ISSN：0236-5731

通讯作者： Ding, Dexin

作者机构： [Ding, Dexin; Zhang, Hui; Li, Le; Dai, Zhongran; Hu, Nan; Wang, Yongdong] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.;[Sui, Yang] Hunan Taohuajiang Nucl Power Co Ltd, Yiyang 413000, Peoples R China.

通讯机构： [Ding, Dexin] U;Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.

关键词： 2 bromopropionyl bromide;adsorbent;amidoxime;aminopropyltriethoxysilane;chemical compound;ethyl potassium dithiocarbonate;magnetic nanoparticle;nanocomposite;nanoshell;polyacrylonitrile;tetraethoxysilane;ultrasmall superparamagnetic iron oxide;unclassified drug;uranium;adsorption kinetics;analytical parameters;Article;concentration (parameters);contact time;controlled study;covalent bond;desorption;infrared spectroscopy;isotherm;nanoanalysis;pH;polymerization;reversible addition fragmentation chain transfer;scanning electron microscopy;structure analysis;surface property;synthesis;temperature sensitivity;thermodynamics;thermogravimetry;transmission electron microscopy;vibrating sample magnetometer;X ray photoelectron spectroscopy

摘要： In this work, the nanoparticles possessing a macro-initiator (MNPs@SCSOEt) were firstly obtained by surface-initiated RAFT polymerization. The structure of the nanocomposite was characterized by FT-IR, SEM, TEM, TGA, XPS and VSM. The effects of pH, contact time, initial uranium concentrations, coexisting ions and temperature on the U(VI) adsorption by MNPs@PAO were investigated in detail. The adsorption process was found to be in good agreement with pseudo-second order kinetic model and Langmuir adsorption isotherm model. The maximum adsorption capacity was estimated to be 216.45mg/g by fitting Langmuir model with the equilibrium data. The adsorption process was endothermic and spontaneous. In addition, the adsorption capacity of MNPs@PAO for U(VI) decreased slightly after five successive adsorption/desorption cycles. © 2018, Akadémiai Kiadó, Budapest, Hungary.

语种： 英文

作者： Hu, Nan;Li, Ke;Sui, Yang;Ding, Dexin*;Dai, Zhongran;...

期刊： RSC Advances,2018年8(24):13459-13465 ISSN：2046-2069

通讯作者： Ding, Dexin

作者机构： [Ding, Dexin; Zhang, Hui; Li, Dianxin; Li, Ke; Dai, Zhongran; Wang, Nieying; Hu, Nan] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.;[Sui, Yang] Hunan Taohuajiang Nucl Power Co Ltd, Yiyang 413000, Peoples R China.;[Ding, Dexin; Zhang, Hui; Li, Dianxin; Li, Ke; Dai, Zhongran; Wang, Nieying; Hu, Nan] Hunan Prov Key Lab Green Dev Technol Extremely Lo, Hengyang 421001, Peoples R China.

通讯机构： [Ding, Dexin] U;[Ding, Dexin] H;Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.;Hunan Prov Key Lab Green Dev Technol Extremely Lo, Hengyang 421001, Peoples R China.

摘要： In this work, uranium(vi) biomineralization by soluble ortho-phosphate from decomposition of the phosphate rock powder, a cheap and readily available material, was studied in detail. Penicillium funiculosum was effective in solubilizing P from the phosphate rock powder, and the highest concentration of the dissolved phosphate reached 220 mg L-1 (pH = 6). A yellow precipitate was immediately formed when solutions with different concentrations of uranium were treated with PO43--containing fermentation broth, and the precipitate was identified as chernikovite by Fourier transform infrared spectroscopy, scanning electron microscope, and X-ray powder diffraction. Our study showed that the concentrations of uranium in solutions can be decreased to the level lower than maximum contaminant limit for water (50 μg L-1) by the Environmental Protection Agency of China when Penicillium funiculosum was incubated for 22 days in the broth containing 5 g L-1 phosphate rock powder. © 2018 The Royal Society of Chemistry.

语种： 英文

作者： Zhang, Hui;Dai, Zhongran;Sui, Yang;Xue, Jinhua;Ding, Dexin*

期刊： Journal of Radioanalytical and Nuclear Chemistry,2018年317(1):613-624 ISSN：0236-5731

通讯作者： Ding, Dexin

作者机构： [Ding, Dexin; Zhang, Hui; Dai, Zhongran; Xue, Jinhua] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.;[Ding, Dexin; Zhang, Hui; Dai, Zhongran; Xue, Jinhua] Hunan Prov Key Lab Green Dev Technol Extremely Lo, Hengyang 421001, Peoples R China.;[Sui, Yang] Hunan Taohuajiang Nucl Power Co Ltd, Yiyang 413000, Peoples R China.

通讯机构： [Ding, Dexin] U;[Ding, Dexin] H;Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.;Hunan Prov Key Lab Green Dev Technol Extremely Lo, Hengyang 421001, Peoples R China.

关键词： iron oxide;polydopamine;polymer;sea water;titanium dioxide;unclassified drug;uranium;water;adsorption;Article;concentration (parameters);controlled study;energy dispersive X ray spectroscopy;Fourier transform infrared spectroscopy;magnetometry;pH;scanning electron microscopy;simulation;solution and solubility;structure analysis;surface property;time;transmission electron microscopy;waste water;X ray photoemission spectroscopy

摘要： In this study, a novel magnetic core–dual shell Fe3O4@PDA@TiO2 adsorbents was successively prepared by polydopamine (PDA) coated and TiO2 film deposited on the surface of Fe3O4. The structure and properties were characterized by FT-IR, SEM–EDS TEM, VSM and XPS. The adsorption of U(VI) on Fe3O4@PDA@TiO2 was investigated as a function of contact time, solution pH, initial U(VI) concentration and other interfering ions. In addition, the U(VI) adsorption from practical wastewater and simulated seawater was also investigated. The results implied that the Fe3O4@PDA@TiO2 adsorbents exhibited promising adsorption performance for uranium (VI) from aqueous solution and simulated seawater. © 2018, Akadémiai Kiadó, Budapest, Hungary.

语种： 英文