Utilization of phosphate rock as a sole source of phosphorus for uranium biomineralization mediated by Penicillium funiculosum
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
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Scavenging of U(VI) from Impregnated Water at Uranium Tailings Repository by Tripolyphosphate Intercalated Layered Double Hydroxides
作者：
Zhang, Hui;Dai, Zhongran;Sui, Yang;Wang, Nieying;Fu, Haiying;...
期刊：
Industrial & Engineering Chemistry Research ,2018年57(50):17318-17327 ISSN：0888-5885
通讯作者：
Ding, Dexin
作者机构：
[Ding, Dexin; Zhang, Hui; Li, Le; Dai, Zhongran; Wang, Nieying; Li, Guangyue; 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; Li, Le; Dai, Zhongran; Wang, Nieying; Li, Guangyue; Hu, Nan; Wang, Yongdong; Fu, Haiying] Hunan Prov Key Lab Green Dev Technol Extremely Lo, Hengyang 421001, Peoples R China.;[Sui, Yang; Fu, Haiying] Univ South China, Sch Nucl & 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.
摘要：
The impregnated water at a uranium tailings repository has characteristics that its uranium concentration is low and it contains many other interfering ions. In order to develop an efficient adsorbent for such wastewater, Mg-Al layered double hydroxide (Mg-Al-NO3-LDH) and tripolyphosphate intercalated LDH (TPP-LDH-1 and TPP-LDH-2) were synthesized by an anion exchange method and characterized by using multiple analysis techniques, and their behavior and mechanism for U(VI) removal from aqueous solutions were investigated. It is found that their adsorption capacities for U(VI) follow the order Mg-Al-NO3-LDH < TPP-LDH-1 < TPP-LDH-2. The maximum sorption capacities of Mg-Al-NO3-LDH, TPP-LDH-1, and TPP-LDH-2 for U(VI) at pH 5.0 and 298.15 K derived from the Langmuir model are 201.27, 399.01, and 501.76 mg/g, respectively. In addition, tripolyphosphate intercalated LDH show a higher sorption selectivity toward U(VI) over other metal cations and anions. X-ray photoelectron spectroscopy (XPS) and Fourier transform-infrared spectroscopy (FT-IR) characterizations suggest that the higher adsorption capacity and sorption selectivity of TPP-LDH-2 are probably due to the inner-sphere surface complexes resulting from the phosphate groups (P=O, -PO3) with U(VI). The applicability of TPP-LDH-2 for scavenging of U(VI) from the impregnated water at a uranium tailings repository in South China was further evaluated. It is found that TPP-LDH-2 shows excellent removal efficiency for U(VI). The results indicate that tripolyphosphate intercalated LDH is a promising adsorbent for scavenging of U(VI) from the impregnated water at the uranium tailings repository. Copyright © 2018 American Chemical Society.
语种：
英文
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Transformation of uranium species in soil during redox oscillations
作者：
Fu, Haiying;Zhang, Hui;Sui, Yang;Hu, Nan;Ding, Dexin* ;...
期刊：
Chemosphere ,2018年208(Oct.):846-853 ISSN：0045-6535
通讯作者：
Ding, Dexin
作者机构：
[Ding, Dexin; Zhang, Hui; Ye, Yongjun; Li, Guangyue; Dai, Zhongran; Hu, Nan; Wang, Yongdong; Fu, Haiying] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.;[Ding, Dexin; Ye, Yongjun; Sui, Yang; Fu, Haiying] Univ South China, Sch Environm & Safety Engn, Hengyang 421001, Hunan, 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：
Redox cycling;Uranium speciation;Stable U(IV);Chemical extraction;Paddy soil
摘要：
Redox oscillation is commonly found in near-surface environment, where soils are often polluted with many redox active contaminants, including uranium (U). In order to investigate the transformation of U species in near-surface soil under redox oscillations conditions, redox oscillations and reduction experiments were performed, biogeochemical parameters and native microbial community composition were monitored, main elements on the surface of solid-phase were analyzed by XPS, and labile U(IV) species and stable U(IV) species in solid-phase were provisionally defined using an anoxic 1 M sodium bicarbonate extraction. It was found that redox oscillations slightly increased the water-soluble U but significantly increased the stable U(IV) species (P < 0.05) in soil. In reduction experiment, there was upper limit value for percentage of stable U(IV) species, and the labile U(IV) species could not transform to stable U(IV) species in a short period of time under reduction conditions. The redox transition of Fe enriched on the surface of soil and the conversion of microbial community composition played a major role in speciation transformation of U under redox oscillations conditions. In addition, sequential extraction revealed that the increase of stable U(IV) species content reflected the U speciation transition from acetate extract to more recalcitrant hydroxylamine extract. The finding provides a potential method for improving the stability of U when bio-reduction is used to remediate the U-contaminated soils. © 2018 Elsevier Ltd
语种：
英文
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博落回对不同化学形态铀的富集特征
作者：
稂涛;胡南;张辉;李广悦;王永东;...
期刊：
环境科学研究 ,2017年30(8):1238-1245 ISSN：1001-6929
通讯作者：
Ding, D.
作者机构：
[稂涛; 胡南; 张辉; 李广悦; 王永东; 丁德馨] 南华大学, 铀矿冶生物技术国防重点学科实验室;[稂涛; 胡南; 张辉; 李广悦; 王永东; 丁德馨] 极贫铀资源绿色开发技术湖南省重点实验室, 湖南, 衡阳, 421001
关键词：
博落回;铀的化学形态;水培试验;富集特征;转移
摘要：
为了研究陆生植物博落回 (Macleaya Cordata)对不同化学形态铀的富集特征,采用Visual MINTEQ地球化学平衡软件设计了五种含不同化学形态铀〔UO_2~(2 +)、CaUO_2 (CO_3 )_3~(2 -)、UO_2Cit~-、 (UO_2 )_2 (EDTA)_2~(4 -)和UO_2HPO_4〕的培养液,开展水培试验.博落回在这五种培养液中分别培养1、5、10、15、20和25 d后,测定其株高、根长和干质量,并用电感耦合等离子体质谱仪 (ICP-MS)测定其地上部分和根部的w(铀).结果表明:在不同化学形态铀胁迫下,博落回株高无显著差异,UO_2HPO_4可促进博落回根的生长,而 (UO_2)_2 (EDTA)_2~(4 -)降低了博落回的干质量.并且,博落回根部对不同化学形态铀的富集能力大小顺序为UO_2~(2 +) > UO_2HPO_4 > CaUO_2 (CO_3 )_3~(2 -) > UO_2Cit~- > (UO_2)_2 (EDTA)_2~(4 -),博落回地上部分对不同化学形态铀的富集能力大小顺序为UO_2Cit~- > (UO_2)_2 (EDTA)_2~(4 -) > UO_2~(2 +) > CaUO_2 (CO_3 )_3~(2 -) > UO_2HPO_4.此外,博落回根部对UO_2~(2 +)的富集能力很高,但地上部分很低.添加柠檬酸,培养液中铀的主要化学形态为UO_2Cit~-,并且在100 mg/L铀的胁迫下,博落回对UO_2Cit~-的生物富集系数和转移系数分别达到0. 09和8. 53.因此,要提高博落回对铀污染土壤中铀的富集和转移,可添加柠檬酸,促使土壤中铀的形态以UO_2Cit~-为主,同时要降低土壤中碳酸盐和磷酸盐的含量.
语种：
中文
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New Amidoxime-Based Material TMP-g-AO for Uranium Adsorption under Seawater Conditions
作者：
Zeng, Jiayun;Zhang, Hui;Sui, Yang;Hu, Nan;Ding, Dexin* ;...
期刊：
Industrial & Engineering Chemistry Research ,2017年56(17):5021-5032 ISSN：0888-5885
通讯作者：
Ding, Dexin
作者机构：
[Ding, Dexin; Zhang, Hui; Zeng, Jiayun; Hu, Nan; Wang, Fang; Xue, Jinhua; 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.
摘要：
A novel amidoxime-based adsorbent of titanium-molybdopyrophosphate-g-amidoxime (TMP-g-AO) was prepared by chemical coprecipitation and subsequent chemical modifications. The successful grafting of acrylonitrile group and the subsequent conversion of acrylonitrile group to amidoxime groups were characterized by scanning electron microscopy-energy dispersive spectroscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, N2-BET, and thermal analysis. The adsorption behavior of uranium(VI) on TMP-g-AO was investigated for low concentration uranium solution by batch experiments at a fixed pH of 8.2 ± 0.1. It is found that the adsorption rate of uranium from solution was 99.77% when the uranium concentration was 42.3 μg/L, pH = 8.2 ± 0.1, temperature = 298.15 K, and the adsorbent dosage = 0.05 g. The kinetic data follow the pseudo-second-order model, and adsorption equilibrium data fit the Langmuir model well. The thermodynamics parameters (ΔS, ΔH, and ΔG) indicate that the adsorption process is spontaneous and endothermic. The functional TMP-g-AO adsorbent exhibits good selectivity and affinity for uranium ions under coexisting multimetal ions except for Fe3+ and Co2+. Desorption was performed, and the adsorption rate of uranium by TMP-g-AO only decreased 1.42% after five consecutive adsorption-desorption cycles. In order to evaluate the potential application of TMP-g-AO for uranium extraction from seawater, the experiments on adsorption of uranium(VI) from natural seawater and the uranium-doped seawater were conducted, and the adsorbent exhibited a high adsorption rate of uranium(VI). The results show that TMP-g-AO could be a very promising adsorbent for uranium extraction from seawater. © 2017 American Chemical Society.
语种：
英文
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Role of water contents on microwave roasting of gold bearing high arsenic sulphide concentrate
作者：
Hu, Nan;Chen, Wei;Ding, De-xin* ;Li, Feng;Dai, Zhong-ran;...
期刊：
Minerals Engineering ,2017年161:72-77 ISSN：0892-6875
通讯作者：
Ding, De-xin
作者机构：
[Chen, Wei; Dai, Zhong-ran; Li, Guang-yue; Zhang, Hui; Li, Feng; Hu, Nan; Ding, De-xin; Wang, Yong-dong; Lang, Tao] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.;[Hu, Nan; Ding, De-xin] Hunan Prov Key Lab Green Dev Technol Extremely Lo, Hengyang 421001, Peoples R China.
通讯机构：
[Ding, De-xin] U;Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.
关键词：
Gold bearing high arsenic sulphide concentrate;Microwave roasting;Water content;Iodide/iodine leaching
摘要：
A new technology for enhancing microwave roasting of gold bearing high arsenic sulphide concentrate with various water contents was proposed. The influence of water content and roasting time on microwave roasting of gold concentrate was investigated, and the mechanism of microwave roasting of gold bearing high arsenic sulphide concentrate with various water contents was analyzed. The results show that the removal rate of sulfur and iodide/iodine leaching rate of gold are mainly dependent on water content. The removal rate of sulfur and the leaching rate of gold reaches 87.95% and 75.08%, respectively, under the conditions of water content of 9% with microwave roasting for 30 min. After the dried concentrate sample and the wetted concentrate sample with 9% water content were roasted in the microwave oven for 60 min, the latter was found by SEM to be more porous than former, its specific surface area was found to increase from 25.6 to 32.7 m(2)/g. (C) 2017 Elsevier B.V. All rights reserved.
语种：
英文
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满江红对不同形态铀的吸附行为
作者：
谭煜健;胡南;张辉;胡劲松;黄新伟;...
期刊：
环境科学学报 ,2017年37(10):3713-3719 ISSN：0253-2468
通讯作者：
Ding, D.
作者机构：
[谭煜健; 胡南; 张辉; 胡劲松; 黄新伟; 丁德馨] 南华大学, 铀矿冶生物技术国防重点学科实验室, 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：
铀形态;满江红;生长抑制率;吸附行为
摘要：
首先采用Visual MINTEQ 3.1软件模拟了不同pH及不同浓度的碳酸盐或磷酸盐溶液中不同形态铀所占的比例;随后根据模拟结果,配制了5种分别含有UO_2~(2+) 、(UO_2)_3(OH)_5~+ 、UO_2(OH)_3~-、UO_2(CO_3)_3~(4-)和UO_2PO_4~-的铀溶液;最后通过水培实验研究了满江红对这5种不同形态铀的吸附行为.结果表明,这5种不同形态铀对满江红的生长抑制率有显著差异,UO_2~(2+) 、(UO_2)_3(OH)_5~+ 、UO_2(OH)_3~-及UO_2(CO_3)_3~(4-)均能抑制满江红的生长,其中,UO_2~(2+)对满江红的生长抑制率最高,而UO_2PO_4~-则可以促进满江红的生长,但满江红对UO_2~(2+)和(UO_2)_3(OH)_5~+的吸附效率相对较高.当溶液中铀的浓度为2 mg·L~(-1)时,UO_2~(2+)对满江红的富集量和富集系数分别达到了3831 mg·kg~(-1)和1916,(UO_2)_3(OH)_5~+对满江红的富集量和富集系数分别达到了3057 mg·kg~(-1)和1529.可见,要提高满江红对水中铀的去除率和富集量,应将溶液中铀的形态调控为以UO_2~(2+)或(UO_2)_3(OH)_5~+为主,同时要降低溶液中碳酸盐和磷酸盐的含量.
语种：
中文
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Selective removal of U(VI) from low concentration wastewater by functionalized HKUST-1@H3PW12O40
作者：
Zhang, Hui;Xue, Jinhua;Hu, Nan;Sun, Jing;Ding, Dexin* ;...
期刊：
Journal of Radioanalytical and Nuclear Chemistry ,2016年308(3):865-875 ISSN：0236-5731
通讯作者：
Ding, Dexin
作者机构：
[Ding, Dexin; Zhang, Hui; Li, Le; Hu, Nan; Sun, Jing; Xue, Jinhua; Wang, Yongdong] 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：
HKUST-1@H3PW12O40;Adsorption;Uranium;Thermodynamics;Kinetics
摘要：
The adsorption of U(VI) from low concentration solution by [email protected]3PW12O40 was studied as a function of various experimental parameters including pH, interfering ions, contact time, initial uranium concentration and temperature by batch experiments. Equilibrium data were found to fit with Langmuir isotherm model better than Freundlich isotherm model. The kinetic adsorption was fitted by the pseudo-second-order model well. Thermodynamic data from the adsorption experiments indicate that adsorption process is spontaneous and endothermic. [email protected]3PW12O40 can selectively adsorb U(VI) from multi-metal ion solutions and the adsorption capacity of [email protected]3PW12O40 don’t decrease significantly after three cycles of desorption-reuse. The results show that [email protected]3PW12O40 is suitable for removal of U(VI) from low concentration solutions. © 2015, Akadémiai Kiadó, Budapest, Hungary.
语种：
英文
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Developmental toxicity and oxidative stress induced by gamma irradiation in zebrafish embryos
作者：
Hu, Miao;Hu, Nan;Ding, Dexin* ;Zhao, Weichao;Feng, Yongfu;...
期刊：
Radiation and Environmental Biophysics ,2016年55(4):441-450 ISSN：0301-634X
通讯作者：
Ding, Dexin
作者机构：
[Ding, Dexin; Hu, Miao; Zhang, Hui; Feng, Yongfu; Li, Guangyue; Hu, Nan; Wang, Yongdong; Zhao, Weichao] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Ding, Dexin] U;Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Hunan, Peoples R China.
关键词：
Gamma irradiation;Zebrafish embryo;Oxidative stress;Developmental toxicity;Biomarker
摘要：
This study aimed to evaluate the biological effects of gamma irradiation on zebrafish embryos. Different doses of gamma rays (0.01, 0.05, 0.1, 0.5 and 1 Gy) were used to irradiate zebrafish embryos at three developmental stages (stage 1, 6 h post-fertilization (hpf); stage 2, 12 hpf; stage three, 24 hpf), respectively. The survival, malformation and hatching rates of the zebrafish embryos were measured at the morphological endpoint of 96 hpf. The activities of superoxide dismutase (SOD), catalase (CAT), glutathione reductase (GR), glutathione peroxidase (GPx) and glutathione S-transferase (GST) were assayed. Morphology analysis showed that gamma irradiation inhibited hatching and induced developmental toxicity in a dose-dependent manner. Interestingly, after irradiation the malformation rate changed not only in a dose-dependent manner but also in a developmental stage-dependent manner, indicating that the zebrafish embryos at stage 1 were more sensitive to gamma rays than those at other stages. Biochemical analysis showed that gamma irradiation modulated the activities of antioxidant enzymes in a dose-dependent manner. A linear relationship was found between GPx activity and irradiation dose in 0.1–1 Gy group, and GPx was a suitable biomarker for gamma irradiation in the dose range from 0.1 to 1 Gy. Furthermore, the activities of SOD, CAT, GR and GPx of the zebrafish embryos at stage 3 were found to be much higher than those at other stages, indicating that the zebrafish embryos at stage 3 had a greater ability to protect against gamma rays than those at other stages, and thus the activities of antioxidant enzymes changed in a developmental stage-dependent manner.
语种：
英文
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Adsorption and recovery of U(VI) from low concentration uranium solution by amidoxime modified Aspergillus niger
作者：
Li, Le;Hu, Nan;Ding, Dexin* ;Xin, Xin;Wang, Yongdong;...
期刊：
RSC Advances ,2015年5(81):65827-65839 ISSN：2046-2069
通讯作者：
Ding, Dexin
作者机构：
[Ding, Dexin; Zhang, Hui; Tan, Yan; Li, Le; Hu, Nan; Xin, Xin; Xue, Jinhua; Wang, Yongdong] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.;[Tan, Yan; Li, Le; Xue, Jinhua] 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.
摘要：
Amidoxime modified Aspergillus niger (AMAN) was prepared by the oximation reaction. The effects of the initial pH, contact time, initial U(vi) concentration and biosorbent dose on the adsorption of U(vi) ions from radioactive wastewater in U(vi) concentrations of less than 1 mg L<sup>-1</sup>by AMAN and the raw Aspergillus niger (RAN) were investigated. The maximum adsorption efficiency by AMAN for the 0.5 mg L<sup>-1</sup>U(vi) solution amounted to 98.85% under the optimum adsorption conditions, while the maximum adsorption efficiency by RAN was only 77.83%. The adsorption equilibrium data were found to be best fitted to Langmuir isotherm model, and the maximum biosorption capacity of AMAN for U(vi) was estimated to be 621 mg g<sup>-1</sup>at 298 K. The biosorption kinetics followed the pseudo-second order model and intraparticle diffusion equation. The Gibbs free energy change (ΔG°), enthalpy change (ΔH°) and entropy change (ΔS°) showed that the adsorption process of U(vi) was spontaneous, feasible and endothermic. The SEM-EDS study indicated that much more U(vi) ions were adsorbed by AMAN than by RAN. FT-IR study showed that the -NH<inf>2</inf>and =N-OH groups of amidoxime were the dominant ones for binding UO<inf>2</inf><sup>2+</sup>ions. Moreover, AMAN was found to have excellent selective adsorption capability of U(vi) due to amidoxime groups. The UO<inf>2</inf><sup>2+</sup>ions adsorbed by AMAN could be desorbed using 0.1 M HCl, and the desorption efficiency reaching 87.28% at the 8th cycle of adsorption and desorption. ©The Royal Society of Chemistry.
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英文
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