作者： Zhou, T. H.;He, L.;Deng, Q. W.;Ding, D. X.;Wang, Y. D.;...

期刊： International Journal of Environmental Science and Technology,2023年20(2):1769-1778 ISSN：1735-1472

通讯作者： Deng, QW

作者机构： [Zhou, T. H.; He, L.; Chen, Y. X.; Wang, Y. D.; Ding, D. X.; Deng, QW; Deng, Q. W.] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Hunan, Peoples R China.;[Zhou, T. H.; He, L.; Chen, Y. X.; Deng, QW; Deng, Q. W.] Univ South China, Hengyang Key Lab Soil Pollut Control & Remediat, Hengyang 421001, Hunan, Peoples R China.;[Zhou, T. H.; He, L.; Chen, Y. X.; Wang, Y. D.; Ding, D. X.; Deng, QW; Deng, Q. W.] Univ South China, Sch Resources Environm & Safety Engn, Hengyang 421001, Hunan, Peoples R China.;[He, L.] China Bluestar Chonfar Engn & Technol Co Ltd, Changsha 410007, Hunan, Peoples R China.

通讯机构： [Deng, QW ] U;Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Hunan, Peoples R China.;Univ South China, Hengyang Key Lab Soil Pollut Control & Remediat, Hengyang 421001, Hunan, Peoples R China.;Univ South China, Sch Resources Environm & Safety Engn, Hengyang 421001, Hunan, Peoples R China.

关键词： Bacteria;Fourier transform infrared spectroscopy;Pollution;Wastewater treatment;Binding effects;Endophyte;Integrated remediation;Low concentrations;Podophyllum;Symbiotics;Syngonium podophyllum;Typha orientalis;Urania and wastewater;Uranium concentration;Uranium;bacterium;colonization;endophyte;experimental study;monocotyledon;uranium;wastewater treatment

摘要： Treatment of uranium-containing wastewater using a plant–microbe symbiotic system appears promising. To find a viable method for wastewater treatment containing low concentrations of uranium (5mg/L or lower), a Syngonium(S) podophyllum-endophyte symbiotic system was designed and hydroponic remediation experiments were conducted. After 25days of treatment, the uranium concentrations of the wastewater samples with uranium concentrations between 0.5 and 2.0mg/L were lowered to below 0.05mg/L. Analysis of the concentration data and transfer factors (TF) of uranium in plant roots, stems and leaves showed that S. podophyllum concentrated uranium mainly through its roots. Furthermore, Fourier transform infrared spectroscopy (FTIR) showed that the roots of S. podophyllum colonized by Bacteria XNN8 (separated from Typha orientalis, beef extract peptone medium, bacteria numbered eight) produced more sugars and –OH than that by the uncolonized S. podophyllum, hence promoting the binding effect of –OH on uranium in plants. Colonization by actinomycetes XNG3 (separated from Typha orientalis, modified Gao’s No. 1 medium, actinomycetes numbered three) might either increase the content of C = O, COO–, C–O and C–N in the roots of S. podophyllum or strengthen the binding effect of these functional groups with uranium. © 2022, The Author(s) under exclusive licence to Iranian Society of Environmentalists (IRSEN) and Science and Research Branch, Islamic Azad University.

语种： 英文

作者： Ye, Yongjun;Liu, Shuyuan;Xia, Ming;Yu, Ting;Shang, Shanwei

期刊： Environmental Pollution,2023年331(Pt 2):121915 ISSN：0269-7491

通讯作者： Ye, YJ

作者机构： [Ye, Yongjun; Xia, Ming; Shang, Shanwei; Liu, Shuyuan; Yu, Ting] Univ South China, Sch Resources Environm & Safety Engn, Hengyang 421001, Hunan, Peoples R China.;[Ye, Yongjun] Univ South China, Natl Joint Engn Res Ctr Airborne Pollutants Contro, Hengyang 421001, Hunan, Peoples R China.;[Ye, Yongjun] Univ South China, Lab Natl Def Biotechnol Uranium Min & Hydromet, Hengyang 421001, Hunan, Peoples R China.

通讯机构： [Ye, YJ ] U;Univ South China, Sch Resources Environm & Safety Engn, Hengyang 421001, Hunan, Peoples R China.

关键词： Coverage experiment;Modular float;Radon retardation rate;Uranium mine

摘要： Radon-containing water bodies in uranium mining areas inevitably release radon gas, polluting the surrounding environment via radiation. Thus, it is particularly important to develop devices with the ability to retard the radon release from such water bodies. Based upon theories of radon exhalation in water, a radon exhalation retardation device (RERD) with flexible, modular floats (a flexible polyvinyl chloride material module that floats on water) was designed and manufactured. To study the modular surface-covering floats’ effectiveness in retarding radon release from water surfaces, an experimental setup was constructed to simulate radon release from water bodies, using a granular uranium ore sample from a uranium mine as sediment material. Closed-loop measurements were taken to determine the radon exhalation rate on the exposed surface of the water in uncovered and covered conditions. Radon retardation rates were also compared for different area coverage (29.6%, 59.1%, and 88.7%) and immersion depths (0.02 m and 0.04 m) in unperturbed and perturbed water bodies. The results show that: 1) the greater the area coverage, the greater the radon retardation rate in both unperturbed and perturbed water bodies; 2) under the same coverage conditions, the surface radon exhalation rate and the radon transfer velocity at the gas-liquid interface of the perturbed water are larger than those of the unperturbed water; 3) The immersion depth of modular surface-covering floats has a stronger effect on the radon retardation rate in unperturbed water bodies than in perturbed water bodies. The study shows that the proposed modular floats are effective in retarding radon release from both perturbed and unperturbed water bodies. © 2023 Elsevier Ltd

语种： 英文

作者： Huang, Tao;Zhou, Lulu;Yang, Chun-Hai;Zhang, Shu-wen

期刊： Environmental Pollution,2023年325:121442 ISSN：0269-7491

通讯作者： Huang, Tao(ht1104705720@qq.com)

作者机构： [Huang, Tao; Zhou, Lulu; Yang, Chun-Hai] Changshu Inst Technol, Sch Mat Engn, Changshu 215500, Peoples R China.;[Huang, Tao] Changshu Inst Technol, Suzhou Key Lab Funct Ceram Mat, Changshu 215500, Peoples R China.;[Huang, Tao] China Univ Min & Technol, Sch Chem Engn & Technol, Xuzhou 221116, Jiangsu, Peoples R China.;[Zhang, Shu-wen] Univ South China, Nucl Resources Engn Coll, Hengyang 421001, Peoples R China.

通讯机构： [Tao Huang] S;School of Materials Engineering, Changshu Institute of Technology, 215500, China<&wdkj&>Suzhou Key Laboratory of Functional Ceramic Materials, Changshu Institute of Technology, Changshu, 215500, China<&wdkj&>School of Chemical Engineering & Technology, China University of Mining and Technology, Xuzhou, Jiangsu, 221116, China

关键词： Activation mechanisms;Aluminosilicate geopolymers;Geopolymerization kinetics;Gold tailings;Nonthermal plasma irradiation

摘要： The alkalinity of CaO is commonly insufficient in alkali-activating raw soils or minerals for the formation of cementation or geopolymerization. In this study, nonthermal plasma (NTP) irradiation was employed to activate traditional CaO to enhance its efficacy in alkali activation and further intensify the self-cementation of gold tailings. The solidification/stabilization (S/S) of the gold tailings-based matrix activated by NTP-CaO was better than that of CaO. The NTP irradiation enhanced the surface hydroxyl groups and oxygen atoms, decreased the binding energy, formed nanoparticles, and significantly changed the morphologies of the calcium activator. The dosage of the NTP-irradiated CaO (NTP-CaO) directly affected the self-cemented solidification/stabilization of gold tailings. The Johnson-Mehl-Avrami–Kolmogorov model was appropriate for analysing the NTP-CaO-activated geopolymerization kinetics of gold tailings. Three-dimensional (3D) structural minerals covered with small pores were determined in the NTP-CaO-activated cemented samples. The employment of NTP-CaO facilitated the formation of aluminosilicate geopolymers during the self-cementation of gold tailings according to comprehensive characterization strategies. The study achieves the efficient self-remediation of gold tailings by activating calcium precursors, which further solves the contradiction between salinization and alkali activation in the field of noncalcined cementitious materials. © 2023 Elsevier Ltd

语种： 英文

作者： Chen, Lijie;Gao, Yuan;Lian, Junjie;Li, Le;Ding, Dexin;...

期刊： Separation and Purification Technology,2023年307:122873 ISSN：1383-5866

通讯作者： Dai, Zhongran(dzr1122@126.com)

作者机构： [Ding, Dexin; Li, Le; Dai, Zhongran; Chen, Lijie; Lian, Junjie] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Min, Hengyang 421001, Peoples R China.;[Gao, Yuan] China Univ Min & Technol, Sch Chem Engn & Technol, Xuzhou 221116, Jiangsu, Peoples R China.

通讯机构： [Zhongran Dai] K;Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang 421001, China

关键词： U(VI);Photoreduction;Adsorption;Removal;Mechanism

摘要： Photocatalytic reduction of soluble hexavalent uranium to insoluble tetravalent uranium is a promising strategy for uranium-containing wastewater treatment, while this method generally requires anaerobic conditions and/or the addition of sacrificial agents. Obviously, providing anaerobic environment and sacrificial agent will not only increase the cost but also causes secondary pollution. Thus, efficient removal of U(VI) by photocatalytic techniques under air atmosphere without sacrificial agents is an urgent task and great challenge. In this work, a novel O, K co-doped g-C3N4 (OKDCN) photocatalyst was synthesized by a simple thermal reaction for the photoreduction removal of U(VI) under air atmosphere without sacrificial agents. Batch experiments show that the OKDCN-2 can nearly completely remove U(VI) in the solution within 120 min at pH 5.0. In addition, the OKDCN showed excellent reusability and selectivity in the process of photocatalytic reduction of U(VI). Further mechanism studies show the doping of O and K can improve the photogenerated carrier transfer and separation efficiency of OKDCN, and then improve the performance of photocatalytic reduction of uranium. These results provide a reference for breaking through some bottleneck issues in the research field of photocatalytic removal of U(VI). © 2022 Elsevier B.V.

语种： 英文

作者： Wang, Chenxu;Wang, Guohua;Xie, Shuibo;Dong, Zhitao;Zhang, Lantao;...

期刊： Journal of Hazardous Materials,2023年454:131484 ISSN：0304-3894

通讯作者： Xie, SB

作者机构： [Xie, Shuibo; Dong, Zhitao; Wang, Chenxu; Zhang, Lantao; Zhang, Zhiyue; Wang, Guohua; Deng, Yibo; Song, Jian] Univ South China, Sch Civil Engn, Hengyang 421001, Peoples R China.;[Xie, Shuibo] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Min, Hengyang 421001, Peoples R China.

通讯机构： [Xie, SB ] U;Univ South China, Sch Civil Engn, Hengyang 421001, Peoples R China.

关键词： Biofilms;Composite materials;Metabolites;Phosphorus;Reusability;Water pollution;Adsorption behaviour;Adsorption mechanism;Alcaligenes faecalis;Biochar;Biocomposite;Extracellular;Interfacial adsorption;Phosphorus stability;Polymeric substance;Synergistic effect;Adsorption;calcium;calcium ion;charcoal;graphene oxide;Lewis acid;magnesium;metal ion;phosphate;phosphoric acid;phosphorus;sodium;uranium;charcoal;mineral;phosphorus;adsorption;bacterium;biochar;phosphate;phosphorus;uranium;wastewater;adsorption;Alcaligenes faecalis;aqueous solution;Article;biofilm;biomineralization;biosorption;chemisorption;complex formation;controlled study;corrosion;crystal structure;degradation;deprotonation;diffusion;dissolution;Fourier transform infrared spectroscopy;immobilization;isoelectric point;nonhuman;particulate matter;pore volume;porosity;reaction time;scanning electron microscopy;surface area;surface property;swine manure;viscosity;waste component removal;wastewater;adsorption;kinetics;wastewater;Adsorption;Alcaligenes faecalis;Charcoal;Kinetics;Minerals;Phosphates;Phosphorus;Uranium;Wastewater

摘要： Phosphorus-rich biochar (PBC) has been extensively studied due to its significant adsorption effect on U(VI). However, the release of phosphorus from PBC into solution decreases its adsorption performance and reusability and causes phosphorus pollution of water. In this study, Alcaligenes faecalis (A. faecalis) was loaded on PBC to produce a novel biocomposite (A/PBC). After adsorption equilibrium, phosphorus released into solution from PBC was 2.32 mg/L, while it decreased to 0.34 mg/L from A/PBC (p < 0.05). The U(VI) removal ratio of A/PBC reached nearly 100%, which is 13.08% higher than that of PBC (p < 0.05), and it decreased only by 1.98% after 5 cycles. When preparing A/PBC, A. faecalis converted soluble phosphate into insoluble metaphosphate minerals and extracellular polymeric substances (EPS). And A. faecalis cells accumulated through these metabolites and formed biofilm attached to the PBC surface. The adsorption of metal cations on phosphate further contributed to phosphorus fixation in the biofilm. During U(VI) adsorption by A/PBC, A. faecalis synthesize EPS and metaphosphate minerals by using the internal components of PBC, thus increasing the abundance of acidic functional groups and promoting U(VI) adsorption. Hence, A/PBC can be a green and sustainable material for U(VI) removal from wastewater. © 2023 Elsevier B.V.

语种： 英文

作者： Wu, Fan;Xie, Shuibo

期刊： Journal of Physics: Conference Series,2023年2587(1):012031 ISSN：1742-6588

作者机构： [Wu, Fan] College of Civil Engineering, University of South China, Hunan, Hengyang, China;Key Discipline Lab. for National Defence of Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang;421001, China;[Xie, Shuibo] College of Civil Engineering, University of South China, Hunan, Hengyang, China <&wdkj&> Key Discipline Lab. for National Defence of Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang;[Xie, Shuibo] 421001, China

摘要： <jats:title>Abstract</jats:title> <jats:p>In this study, a green and efficient persimmon tannin functionalized polyacrylonitrile fiber (PAN-TETA-PT) was prepared and used to treat U(VI). The influence of pH value, adsorption temperature and time, and fiber material dosage on the adsorption U(VI) of PAN-TETA-PT fibers were investigated, and the kinetics, isotherm, and thermodynamics of fibers were analyzed. When the pH is 6, the temperature is 30°C, and the fiber dosage is 0.2 g·L<jats:sup>−1</jats:sup>, the adsorption rate of PAN-TETA-PT fibers to U(VI) was 96.5%, and the U(VI) adsorption capacity was 159.75 mg/g. The kinetic and isothermal studies show that the adsorption of PAN-TETA-PT fibers to U(VI) is chemisorbed and multilayer adsorption. The thermodynamic analysis reflects that the PAN-TETA-PT is spontaneously endothermic for the adsorbed U(VI).</jats:p>

语种： 英文

作者： Liu, Yalan;Zhang, Hui;Ding, Yang;Hu, Nan;Ding, Dexin

期刊： Environmental Science: Water Research & Technology,2023年9(5):1480-1490 ISSN：2053-1400

通讯作者： Ding, Dexin(dingdxzzz@163.com)

作者机构： [Ding, Dexin; Zhang, Hui; Hu, Nan; Ding, Yang; Liu, Yalan] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Min, Hengyang 421001, Peoples R China.;[Ding, Dexin; Zhang, Hui; Hu, Nan; Ding, Yang; Liu, Yalan] Hunan Prov Key Lab Green Dev Technol Extremely Low, Hengyang 421001, Peoples R China.

通讯机构： [Dexin Ding] K;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

摘要： Dissolved uranium in groundwater contaminated by acid in situ leaching poses a serious threat to human health and the ecosystem due to its toxicological properties. In this article, carboxy methyl cellulose (CMC) with high dispersity was used to stabilize nano zero-valent iron (nZVI), and highly dispersed CMC-stabilized nZVI (CMC-nZVI) was synthesized by a liquid-phase reduction method, characterized by multiple analysis techniques, and tested for its dispersal and antioxidizing properties. Compared with nZVI, CMC-nZVI showed great dispersal and resistance to oxidation. The effects of oxygen, pH, dosage, initial U(vi) concentration and HA concentration on U(vi) elimination by CMC-nZVI, and the U(vi) removal kinetics and mechanism were investigated. The removal capacity of U(vi) by CMC-nZVI was 400 mg g−1 at pH 3.0, and the dose of 0.1 g L−1 showed excellent uranium removal efficiency under acid conditions. Moreover, CMC-nZVI was used to treat groundwater from an area after acid in situ leach uranium mining, and CMC-nZVI was found to be capable of decreasing the concentration of uranium in the acidic groundwater (pH &lt; 3) from 0.321 to 0.001 mg L−1. The results indicate that CMC-nZVI has potential application prospects in the in situ remediation of groundwater in areas after acid in situ leach uranium mining. © 2023 The Royal Society of Chemistry.

语种： 英文

作者： Zhang, Haibo;Xie, Shuibo

期刊： Journal of Physics: Conference Series,2023年2587(1):012047 ISSN：1742-6588

作者机构： College of Civil Engineering, University of South China, Hengyang, Hunan, China;Key Discipline Lab. for National Defence of Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang;421001, China;[Zhang, Haibo; Xie, Shuibo] College of Civil Engineering, University of South China, Hengyang, Hunan, China <&wdkj&> Key Discipline Lab. for National Defence of Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang;[Zhang, Haibo; Xie, Shuibo] 421001, China

摘要： <jats:title>Abstract</jats:title> <jats:p>Persimmon tannin modified chitosan (PT-CS) microspheres were synthesized by a water bath method using sodium tripolyphosphate (STPP) as a cross-linking agent for the removal of U(VI) from wastewater. The results showed that the optimal preparation conditions for PT-CS were a ratio of PT to CS mass of 4:1 and a reaction temperature of 80°C. When the initial concentration of U(VI) was 5 mg/L, and the pH value was 1.5, the PT-CS was injected at 0.06 g/L, and the reaction was 2.5 h. The removal rate of U(VI) from water reached 99.2%. The results of the deep removal test of U(VI) from rare earth wastewater showed that the concentrations of U(VI) in the combined wastewater and extraction wastewater were reduced from 4.42 mg/L and 2.12 mg/L to within 0.02 mg/L at pH 2.0, respectively. In contrast, the removal rate of high concentrations of Ca<jats:sup>2+ i</jats:sup>n the wastewater reached 99%, meeting the emission standards of the rare earth industry.</jats:p>

语种： 英文

作者： Guo, Yu;Liu, Xiaoyang;Xie, Shuibo;Liu, Haiyan;Wang, Chenxu;...

期刊： Colloids and Surfaces A: Physicochemical and Engineering Aspects,2022年642:128606 ISSN：0927-7757

通讯作者： Xie, Shuibo(xiesbmr@263.net)

作者机构： [Guo, Yu; Xie, Shuibo; Wang, Chenxu; Wang, Lingzhi; Liu, Haiyan] Univ South China, Coll Civil Engn, Hengyang 421001, Peoples R China.;[Xie, Shuibo] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.;[Liu, Xiaoyang] Water Resources Bur Ziyang Dist, Yiyang City 413001, Peoples R China.

通讯机构： [Shuibo Xie] C;College of Civil Engineering, University of South China, Hengyang 421001, China<&wdkj&>Key Discipline Laboratory for National Defence of Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang 421001, China

关键词： Adsorption mechanism;Adsorption properties;Modified biochar;Polyacrylamide gel;U(VI)

摘要： A novel three dimensional ZnO modified biochar-based hydrogel (ZBCG) was fabricated and employed for removing U(VI) in aqueous solution. The ZBCG hydrogel, the successful loading of ZnO modified biochar (ZBC) confirmed by SEM and FTIR, has showed a well mechanical characteristics, thermal stability, anti-swelling property and adsorption performance for U(VI) than pure hydrogels (BG). At T = 40 ℃, pH = 5, the maximum adsorption capacity of the Langmuir model was 239.21 mg/g. According to adsorption kinetics tests, the chemical adsorption has occupied the leading status in the adsorption process of ZBCG for U(VI). More importantly, ZBCG could be quickly separated and easily regenerated. After 5 cycles of adsorption-desorption, ZBCG have kept the uranium adsorption efficiency of 78.88%. On account of spectroscopic analyses, the mechanisms between ZBCG and U(VI) were involved ion exchange with Zn2+ and chelation by -OH and -COOH. This study proved that ZBCG could be considered the effective and promising material for U(VI) removement from an aqueous solution. © 2022

语种： 英文

作者： Dai, Zhongran;Lian, Junjie;Sun, Yusu;Li, Le;Zhang, Hui;...

期刊： Chemical Engineering Journal,2022年433:133766 ISSN：1385-8947

通讯作者： Ding, DX

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

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

关键词： Mechanism;Photoelectrocatalytic;Removal;Uranium;Wastewater

摘要： Removal of uranium from uranium-containing wastewater is of great significance for uranium contamination remediation and development of nuclear energy. In this paper, the g-C3N4/Sn3O4/Ni (CSN) electrode was fabricated and used as photoanode for photoelectrocatalytic reduction of U(VI) under visible LED light irradiation, and a photoelectrocatalytic approach was proposed to efficiently remove uranium from uranium-containing wastewater. The U(VI) was deposited as U(IV) at cathode and the removal rate of U(VI) reached 94.28 % at pH of 5.0 for photoelectrocatalytic approach, while the removal rates of U(VI) only amounted to 10.56 % and 36.65 % for the photocatalytic and electrochemical extraction approaches, respectively. Furthermore, the photoelectrocatalytic reduction mechanism for U(VI) is explored by XPS, EIS, PL, EPR and DFT calculations, which indicated that the excellent photoelectrocatalytic performance of CSN electrode for U(VI) is mainly because it enhanced visible light absorption, promoted separation of photogenerated electron-hole pairs and decreased the band gap. This work provided a facile route for efficient removal of U(VI) from uranium-containing wastewater via photoelectrocatalytic method. © 2021

语种： 英文

作者： Sun, Jing;Li, Qian;Li, Ting;Xu, Keling;Cui, Zhao;...

期刊： Minerals Engineering,2022年184:107672 ISSN：0892-6875

通讯作者： Li, Guangyue(lgy673@163.com)

作者机构： Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.;[Li, Guangyue] Univ South China, Sch Resources Environm & Safety Engn, Hengyang 421001, Hunan, Peoples R China.

关键词： Bioleaching;Corrosion;Dissolution;Metabolites;Ores;Oxalic acid;Pelletizing;Uranium;Aspergillus niger;Bio-ore pellet;Dissolution mechanism;Formation mechanism;Growth phase;Growth phasis;Interface mechanics;Niger;Uranium dissolution;Uranium leaching;Aspergillus

摘要： In the one-step bioleaching process of uranium by Aspergillus niger, the formation mechanism and uranium bioleaching model of bio-ore pellets were explored and proposed. The results showed that the formation of bio-ore pellets could be divided into three phases. In the adaptive-growth phase, a small number of ore particles were adsorbed by mycelia to form flake mycelia with a diameter of 1–2 mm. In the rapid-growth phase, ore particles began to gather and form stable bio-ore pellets (diameter reaching 4.98 mm) owing to the force of electrostatic attraction, secretion of organic acids, and EPS adhesion. In the stationary growth phase, the bio-ore pellets have been stably formed (Zeta potential stable at approx. ±2.5 mV), the oxalic acid, citric acid, and tartaric acid secreted by A. niger accumulated and reached a peak of 7625 mg/L, and the uranium recovery achieved a peak of 79.6%. Furthermore, the atomic force microscope (AFM) scanning results indicated that the hyphae and metabolites of A. niger could erode the surface of ore particles. Finally, a uranium dissolution model of the bio-ore pellets was established. It indicates that the globular bio-ore pellets were beneficial to uranium dissolution under the double effects of mycelial mechanical damage and organic acid corrosion. © 2022 Elsevier Ltd

语种： 英文

作者： He, Liu;Deng, Qinwen;Ding, Dexin;Wang, Yongdong;Wang, Fan

期刊： ENVIRONMENTAL ENGINEERING SCIENCE,2021年38(7):654-661 ISSN：1092-8758

通讯作者： Deng, Qinwen(dengqw@usc.edu.cn)

作者机构： [Ding, Dexin; He, Liu; Deng, Qinwen; Wang, Yongdong] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.;[He, Liu; Deng, Qinwen; Wang, Fan] Univ South China, Hengyang Key Lab Soil Pollut Control & Remediat, Hengyang, Peoples R China.;[Ding, Dexin; He, Liu; Deng, Qinwen; Wang, Fan; Wang, Yongdong] Univ South China, Sch Resources Environm & Safety Engn, Hengyang, Peoples R China.

通讯机构： [Qinwen Deng] K;Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang, P.R. China. Hengyang Key Laboratory of Soil Pollution Control and Remediation, University of South China, Hengyang, P.R. China. School of Resources, Environment and Safety Engineering, University of South China, Hengyang, P.R. China.

关键词： Macleaya cordata (Willd.) R. Br.;phytoremediation;uranium tailings

摘要： The goal of this research is phytoremediation of uranium-contaminated soil. In the preliminary investigation, Macleaya cordata (Willd.) R. Br. was found to grow in abundance around uranium tailings. Afterward, the field tests to remove uranium from the contaminated soil by the M. cordata (Willd.) R. Br. were conducted. After 3 years of treatment, the contents of uranium in the shallow, middle, and deep layers decreased by 51.2%, 16.6%, and 90.3%, respectively, indicating the transfer of uranium from the tailings. The content of uranium in the roots, stems, and leaves of M. cordata that had been planted for 3 years was significantly higher than that in the first year, indicating the transfer of uranium to M. cordata (The uranium content of the part of M. cordata underground is 1.870 ± 0.288 mg/kg and the content in the aboveground part is 79.815 ± 0.911 mg/kg after 3 years). The results of Mi-Seq indicated that microbial communities were exposed to variations and that microbes, such as Bacillus, Lactococcus, Nitrosomonadaceae, and Roseiflexus, were involved in the remediation of uranium-contaminated soil, demonstrating that the reduced uranium content in the tailings is a result of the joint action by plants and microbes. An infrared analysis indicated that the -OH and COO- groups are the main functional groups in M. cordata involved in the bioconcentration of uranium. Moreover, as time advances, the uranium in the tailings was readily concentrated by the plant, demonstrating that the remediation of radioactive contamination by M. cordata is viable. © Copyright 2021, Mary Ann Liebert, Inc., publishers 2021.

语种： 英文

作者： Huang, Tao*;Zhang, Shu-wen;Liu, Long-fei;Zhou, Lulu

期刊： Chemosphere,2021年263(Jan. Pt.3):128319 ISSN：0045-6535

通讯作者： Huang, Tao

作者机构： [Huang, Tao; Liu, Long-fei; Zhou, Lulu] Changshu Inst Technol, Sch Mat Engn, Changshu 215500, Jiangsu, Peoples R China.;[Huang, Tao] Changshu Inst Technol, Suzhou Key Lab Funct Ceram Mat, Changshu 215500, Jiangsu, Peoples R China.;[Huang, Tao] China Univ Min & Technol, Sch Chem Engn & Technol, Xuzhou 221116, Jiangsu, Peoples R China.;[Zhang, Shu-wen] Univ South China, Nucl Resources Engn Coll, Hengyang 421001, Peoples R China.

通讯机构： [Huang, Tao] C;Changshu Inst Technol, Sch Mat Engn, Changshu 215500, Jiangsu, Peoples R China.

关键词： Green rust;Functionalized composite cementitious material;Geopolymer;Chromate;Granulated blast furnace slag;Fly ash

摘要： Green rust functionalized geopolymer of composite cementitious materials (GR-CCM) was synthesized to improve the adsorption and subsequent stabilization/solidification of chromate in a holistic operating system. The initial pH in solution exhibited the most significant effect on the chromate removal by GR-CCM among three adsorption factors. The maximum monolayer adsorption capacity and theoretical saturation capacity of GR-CCM for Cr(VI) in the acidic condition were 55.01 mg/g and 41.70 mg/g, respectively. Amorphousness brought by loading GR weakened the crystallinity of composite cementitious materials (CCM), which enhanced the adsorption capacity of CCM and boosted the solidification process. The mixed-valent iron species in the GR-CCM not only directly engaged in the adsorption and reduction of chromate also positively strengthened the solidification of Cr species during the whole treatment. This study facilitates the application of GRs on the geopolymer materials and demonstrates the combination of adsorption and immobilization for the treatment of other potential heavy metal contamination. (C) 2020 Elsevier Ltd. All rights reserved.

语种： 英文

作者： Dai, Zhongran;Zhen, Yuan;Sun, Yusu;Li, Le;Ding, Dexin

期刊： Chemical Engineering Journal,2021年415:129002 ISSN：1385-8947

通讯作者： Ding, Dexin(ddxusc@126.com)

作者机构： [Ding, Dexin; Zhen, Yuan; 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： [Dexin Ding] K;Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang 421001, China

关键词： Adsorption;Photoreduction;Removal;Uranium;Wastewater

摘要： The reduction of soluble hexavalent uranium (U(VI)) to insoluble tetravalent uranium (U(IV)) by photocatalytic method is an emerging and effective approach to remove U(VI) from aqueous solution. In this study, the ZnFe2O4/g-C3N4 (ZFOCN) step-scheme (S-scheme) heterojunction was synthesized and used as both adsorbent and photocatalyst for remove U(VI). The batch adsorption experiments showed that the adsorption process of U(VI) by ZFOCN matches the Langmuir isotherm and pseudo-second-order models, and its maximum Langmuir adsorption capacity (qmax) for U(VI) reached 699.3 mg/g at pH 5.0. In addition, ZFOCN exhibited superior photocatalysis properties for reduction of U(VI) under visible LED light irradiation, and its optimal removal capacity for U(VI) via simultaneous adsorption and photoreduction achieved up to 1892.4 mg/g, with the removal rate being 94.62%, which is significantly higher than the physicochemical adsorption. Furthermore, the photoreduction mechanism of U(VI) by ZFOCN is explored by FT-IR, XPS, XRD, EPR and DFT calculations, which indicated that the excellent photocatalysis performance of ZFOCN was mainly due to its strong visible light absorbability and narrow band gap. The U(VI) could be captured on the surface of ZFOCN, and then reduced to U(IV) under visible LED light illumination. Moreover, the removal capacity of U(VI) by ZFOCN remained over 90% after five cycles of tests, and it has negligible decrease in the presence of co-existing metal ions. © 2021 Elsevier B.V.

语种： 英文

作者： Liu, Yuelin;Wu, Shanshan;Liu, Jun;Xie, Shuibo*;Liu, Yingjiu

期刊： RSC Advances,2021年11(8):4810-4817 ISSN：2046-2069

通讯作者： Xie, Shuibo

作者机构： [Liu, Yuelin] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.;[Liu, Yuelin] Hunan Univ Technol, Sch Civil Engn, Zhuzhou 412007, Peoples R China.;[Wu, Shanshan; Xie, Shuibo; Liu, Yingjiu] Univ South China, Hunan Prov Key Lab Pollut Control & Resources Reu, Hengyang 421001, Peoples R China.;[Liu, Jun] Hunan Univ Technol, Sch Life Sci & Chem, Hunan Key Lab Biomed Nanomat & Devices, Zhuzhou 412007, Peoples R China.;[Xie, Shuibo] Univ South China, Sch Civil Engn, Hengyang 421001, Peoples R China.

通讯机构： [Xie, Shuibo] U;Univ South China, Hunan Prov Key Lab Pollut Control & Resources Reu, Hengyang 421001, Peoples R China.;Univ South China, Sch Civil Engn, Hengyang 421001, Peoples R China.

摘要： Photocatalytic technology is a valid solution for the remediation of wastewater containing uranium. In this study, the synthesis of Z-scheme g-C3N4/TiO2 catalysts was made by a thermal synthetic approach for photocatalytic U(vi) reduction. The characterization results revealed the successful synthesis of g-C3N4/TiO2 nanostructures. The g-C3N4 surface was uniformly coated with TiO2 nanoparticles. The depletion of U(vi) in water evaluated the photocatalytic activity of g-C3N4/TiO2 under UV light irradiation. The photocatalytic tests showed that g-C3N4/TiO2 exhibited more effective photocatalytic activity than the raw materials (1.64 and 56.97 times higher than TiO2(P25) and g-C3N4, respectively). Besides, a pseudo-first-order model was followed by the experimental kinetic data for the photocatalytic process. Moreover, g-C3N4/TiO2 still presented high photocatalytic activity after four reacting cycles. Based on these experiment results, the improved photocatalytic activity could be attributed to the Z-scheme mechanism, which decreased the recombination of photo-produced electrons and holes. The synthesis of these g-C3N4/TiO2 nanomaterials provides a facile and inexpensive method for treating wastewater containing U(vi). This journal is © The Royal Society of Chemistry.

语种： 英文

作者： Liu, Xiaoyang;Xie, Shuibo*;Wang, Guohua;Huang, Xin;Duan, Yi;...

期刊： Colloids and Surfaces A: Physicochemical and Engineering Aspects,2021年611:125813 ISSN：0927-7757

通讯作者： Xie, Shuibo

作者机构： [Huang, Xin; Duan, Yi; Xie, Shuibo; Liu, Haiyan; Liu, Xiaoyang; Wang, Guohua] Univ South China, Coll Civil Engn, Hengyang 421001, Peoples R China.;[Xie, Shuibo] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.;[Xie, Shuibo] Univ South China, 28 Changshen Rd, Zhengxiang Dist 421001, Hengyang, Peoples R China.

通讯机构： [Xie, Shuibo] U;Univ South China, 28 Changshen Rd, Zhengxiang Dist 421001, Hengyang, Peoples R China.

关键词： Adsorption;Environmentally sensitive amidoxime hydrogel;Mechanisms;Uranium

摘要： The main aim of this study is to evaluate the removal efficiency of U(VI) using an environmentally sensitive amidoxime hydrogel (AO-NIAMP). The sensitivity of the swelling behaviours to the temperature and pH of AO-NIAMP could promote the adsorption of uranium and facilitate the extraction out itself from solutions. Under the reaction pH of 6.0, and an initial U(VI) concentration o of 16.65 mg L−1,with 22.43 mg of AO-NIAMP, the maximum adsorption capacity was 36.3 mg g−1 as calculated by using response surface methodology (RSM). The adsorption process followed the pseudo-second-order and the Freundlich isotherm model. Moreover, AO-NIAMP showed a stable ability to remove U(VI) from a solution that contained multiple interfering metal ions. Based on spectroscopic analyses, the mechanisms of the removal of U(VI) by AO-NIAMP were the chelation of functional groups and electrostatic interactions. Additionally, the adsorption ability of sites on AO-NIAMP for UO22+ was calculated by density functional theory (DFT),which determined the following orders: oxime nitrogen &gt; [sbnd]CO[dbnd] &gt; oxime type O and N[sbnd](C(NH[sbnd]2)N[dbnd]OH) &gt; oxime oxygen &gt; [sbnd]SO3H. AO-NIAMP could maintain a uranium adsorption rate of 82.5 % after four adsorption (at 30 °C) - desorption (at 40 °C) cycles. By having good swelling properties triggered by external stimuli and the ability to remove uranium, AO-NIAMP has the potential to serve as a uranium extractor. © 2020 Elsevier B.V.

语种： 英文

作者： Liu, Yulong;Ding, Dexin;Chen, Wenguang;Hu, Nan;Wu, Lingling;...

期刊： Metallurgical Research & Technology,2021年118(5):501 ISSN：2271-3646

通讯作者： Yu, Qing(ckyuqingk@126.com)

作者机构： [Yu, Qing; Zhang, Qiucai; Xue, Xilong; Li, Feng; Liu, Yulong; Ding, Dexin; Wu, Lingling; Hu, Lin; He, Guicheng; Hu, Nan; Zhang, Zhijun] Univ South China, Sch Resources Environm & Safety Engn, Hengyang 421001, Peoples R China.;[Yu, Qing; Li, Feng; Liu, Yulong; Chen, Wenguang; Ding, Dexin; He, Guicheng; Hu, Nan] Univ South China, Key Discipline Lab Def Biotechnol Uranium Min & H, Hengyang 421001, Peoples R China.;[Yu, Qing] State Key Lab Safety & Hlth Met Mines, Maanshan 243000, Peoples R China.;[Li, Zhaopeng] Cent South Univ, Sch Resources & Safety Engn, Changsha 410083, Peoples R China.

关键词： Drops;Microwave irradiation;Ores;Particle size;Zinc ore treatment;Comminution energy;Drop weight impact;Energy inputs;Microwave power;Microwave pretreatment;Pulsed microwaves;Water quenching;Crushing

摘要： The relationship between energy input and particle size of ore samples after crushing and effect of microwave pretreatment on impact crushing of lead-zinc ore were studied by drop weight impact test. The results showed that the lead-zinc ore became softer and had higher degree of crushing after microwave pretreatment. Compared with continuous microwave pretreatment, pulsed microwave pretreatment could improve the drop weight impact crushing efficiency of lead-zinc ore. When the specific comminution energy were 5 kW h/t, 10 kW h/t respectively, the crushing characteristic parameters t10 were 60.42% and 67.46% respectively by continuous microwave. But the values of t10 were increased to 68.64% and 75.88% respectively after pulsed microwave radiation under same microwave power and time. In addition, water quenching could more promote the impact crushing efficiency of lead-zinc ore after microwave irradiation. © 2021 EDP Sciences.

语种： 英文

作者： 胡南;陈雪;张辉;李艾书;李广悦;...

期刊： 化工学报,2021年72(10):5354-5361 ISSN：0438-1157

通讯作者： Ding, Dexin(dingdxizzz@163.com)

作者机构： [胡南; 陈雪; 张辉; 李艾书; 李广悦; 王永东; 丁德馨] Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang;421001, China;[胡南; 陈雪; 张辉; 李艾书; 李广悦; 王永东; 丁德馨] 421001, China

关键词： 铀污染;生物修复;脲酶;碳酸盐-铀共沉淀

摘要： 对有钙源条件下Sporosarcina pasteurii诱导碳酸盐-铀共沉淀修复低浓度铀废水的性能开展了试验研究。试验结果表明,该细菌能分泌脲酶水解尿素诱导产生方解石并促使其与铀发生共沉淀,使废水中铀的去除率达到95.38%;该细菌能够耐受的铀浓度高达500 mg/L;铀的去除率随Ca~(2+)浓度的升高而增加;温度在30℃左右和碱性环境有利于方解石与铀的共沉淀。对沉淀产物进行XRD、SEM-EDS表征分析表明,其主要成分为方解石,且包含铀元素;消解分析表明,在方解石形成过程中铀以共沉淀的方式被固定到了沉淀产物中。本研究表明, Sporosarcina pasteurii诱导碳酸盐-铀共沉淀对修复低浓度铀废水有潜在应用前景。

语种： 中文

作者： 伍随意;李仕友;胡俊毅;贺俊钦;王国华;...

期刊： 复合材料学报,2021年38(9):3065-3075 ISSN：1000-3851

通讯作者： Li, Shiyou(lsy730723@163.com)

作者机构： [伍随意; 胡俊毅; 贺俊钦; 王国华; 荣丽杉; 金远远] Hunan Provincial Key Laboratory of Pollution Control and Resources Technology, University of South China, Hengyang;421001, China;[李仕友] Key Discipline Laboratory for National Defence for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang;[伍随意; 李仕友; 胡俊毅; 贺俊钦; 王国华; 荣丽杉; 金远远] 421001, China

通讯机构： [Li, S.] K;Key Discipline Laboratory for National Defence for Biotechnology in Uranium Mining and Hydrometallurgy, China

关键词： 聚乙烯亚胺(PEI);改性;复合材料;吸附;铀;水处理;生物材料

摘要： 为了高效便捷地处理放射性废水,制备了聚乙烯亚胺(PEI)改性磁性酵母(MY)复合生物材料(MY@SiO_2-PEI),并将其用于铀(VI)的去除。采用SEM、FTIR、Zeta电位及XPS对材料进行表征,运用Visual MINTEQ模拟不同条件下U(VI)形态分布,通过研究不同溶液pH、温度、反应时间、离子强度,阴离子(CO_3~(2–)、PO_4~(3–))及不同U(VI)初始质量浓度等方面,考察不同因素对MY@SiO_2-PEI吸附U(VI)的性能影响,并对MY@SiO_2-PEI的循环利用能力进行研究。结果表明,MY@SiO_2-PEI对U(VI)的吸附表现出强pH依赖性,离子强度对吸附效果无显著干扰,说明反应主要受表面络合作用控制。FTIR、XPS及Zeta电位分析发现促使U(VI)吸附的主要因素是材料表面不同官能团(N=C、NH(NH2)、C–N=C)与U(VI)的络合作用及静电吸引作用。MY@SiO_2-PEI最大吸附量可达173.99 mg/g,且吸附在20 min就可达到吸附平衡。准二级动力学和Langmuir等温方程能很好的拟合此吸附过程,且热力学表明吸附过程是自发吸热过程。MY@SiO_2-PEI材料的合成方法简便,去除效果好,再生性佳,是一种很有前途的环境污染治理中放射性核素的吸附剂。

语种： 中文

作者： 刘玉龙;扶海鹰;胡南;李广悦;喻清;...

期刊： 中南大学学报(自然科学版),2021年52(11):3783-3791 ISSN：1672-7207

通讯作者： Ding, Dexin(dingdxzzz@163.com)

作者机构： [刘玉龙; 扶海鹰; 胡南; 李广悦; 喻清; 丁德馨] Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang;421001, China;China General Nuclear Power Group(CGN) Uranium Resources Co. Ltd., Beijing;100029, China;[刘玉龙] 421001, China <&wdkj&> China General Nuclear Power Group(CGN) Uranium Resources Co. Ltd., Beijing

关键词： 强风化强氧化铀矿石;组合浸出工艺;搅拌浸出;柱浸;动力学模型

摘要： 首先,从我国某急倾斜疏干型铀矿床采取铀矿石样,分析其岩石组成、矿物组成和化学组成;其次,将每一类含铀的岩石分别破碎成小于10 mm的颗粒,将其筛分成[0,1),[1,3),[3,5)和[5,10) mm这4个粒级,并将各类岩石按其所占比例进行混合组成综合铀矿样,再将其分别破碎成粒径小于20,15,10和5 mm的颗粒,将它们筛分成[0,1),[1,3),[3,5),[5,10),[10,15)和[15,20) mm这6个粒级,分析各粒级铀矿石的质量分数和品位;第三,将综合铀矿样破碎成粒径小于10 mm的颗粒,将其筛分成[0,0.5)和[0.5,10)这2个粒级,对前者进行搅拌浸出试验,对后者进行柱浸试验;最后,采用ORIGIN软件拟合柱浸试验结果,建立柱浸动力学模型并进行验证。研究结果表明:铀矿石主要由砂岩、砾岩和泥岩组成,其质量分数分别为57%,25%和18%,铀矿物主要为含铀黏土矿物、沥青铀矿物、硅铝铀矿物和水硅铀矿物,且U(VI)质量分数达96.8%,属于强风化强氧化型铀矿石;铀矿石经破碎后,[3,5) mm粒级铀矿石的质量分数最小,而品位最高;铀矿石柱浸动力学模型为y=1 - e-kx,模型参数k与铀矿石粒径呈线性负相关,与硫酸和氯酸钠质量浓度呈线性正相关;对强风化强氧化型铀矿石宜采用搅拌浸出–堆浸组合工艺进行处理,堆浸后期适当增加溶浸液和氧化剂质量浓度可以改善浸出效果,所建立的柱浸动力学模型可以用于预测和控制堆浸过程。

语种： 中文