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
作者机构：
[Song, Dongping; Yang, Chunhai; Huang, Tao] Changshu Inst Technol, Sch Mat Engn, Suzhou 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
期刊：
Separation and Purification Technology,2023年307:122794 ISSN：1383-5866
通讯作者：
Zhongran Dai
作者机构：
[Ding, Dexin; Li, Le; Dai, Zhongran; Chen, Lijie; Liu, Yalan] 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
摘要：
Photocatalysis can convert soluble hexavalent uranium (U(VI)) to insoluble tetravalent uranium (U(IV)), which can then be removed and recovered from water, making it a promising method for treating uranium-containing wastewater. In this study, we developed a novel MnOx-decorated oxygen-doped g-C3N4 (OCNM) photocatalyst for efficient photocatalytic extraction of uranium from uranium-containing wastewater. The oxygen doping and surface-decorated MnOx can synergistic promote the response of visible light and separation and transfer effi-ciency of photogenerated carriers, resulting in excellent performance of OCNM for photocatalytic extraction of uranium. Under aerobic and visible LED light irradiation, the as-synthesized OCNM can almost completely remove U(VI) in uranium solution with a concentration range of 1-100 mg/L at pH 5.0. The removal rate of U (VI) by OCNM remained (91.8%) after 5 consecutive adsorption-desorption cycles tests, indicating that this material is highly recyclable. Furthermore, the OCNM exhibits high selectivity for U(VI) in coexisting metal ion solutions. Further mechanism study revealed that the photogenerated e- and .O2- play an important role in U(VI) removal, with the U(VI) being immobilized as schoepite ((UO2)8O2(OH)12.12H2O) by OCNM during the pho-tocatalytic reaction. This study presents a promising material and approach for the effective treatment of ura-nium wastewater using photocatalytic technology.
作者机构：
[Song, Dongping; Pan, Longwei; Huang, Tao; Zhou, Lulu] Changshu Inst Technol, Sch Mat Engn, Changshu 215500, Peoples R China.;[Song, Dongping; 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
期刊：
Environmental Science and Pollution Research,2023年30(7):18156-18167 ISSN：0944-1344
通讯作者：
Yang, Huaming
作者机构：
[Liu, Hongjuan; Yang, Huaming] China Univ Geosci, Engn Res Ctr Nanogeomat, Minist Educ, Wuhan 430074, Peoples R China.;[Min, Zefu; Liu, Hongjuan; You, Hang; Wang, Xi; Li, Yongjiang] Univ South China, Sch Nucl Sci & Technol, 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; Liu, Yingjiu] Univ South China, Hunan Prov Key Lab Pollut Control & Resources Reu, Hengyang 421001, Peoples R China.;[Yang, Huaming] China Univ Geosci, Key Lab Funct Geomat China Nonmet Minerals Ind, Wuhan 430074, Peoples R China.
通讯机构：
[Yang, Huaming] E;Engineering Research Center of Nano-Geomaterials of Ministry of Education, China University of Geosciences, Wuhan, 430074, People's Republic of China. hm.;Key Laboratory of Functional Geomaterials in China Nonmetallic Minerals Industry, China University of Geosciences, Wuhan, 430074, People's Republic of China. hm.
通讯机构：
[Ding, Y ] U;Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Min, Hengyang 421001, Peoples R China.;Univ South China, Sch Resource & Environm & Safety Engn, Hengyang 421001, Hunan, Peoples R China.
关键词：
Uranium;Immobilization;Hydrogen peroxide;Phosphate;Amorphous iron phosphate
摘要：
The processes of acid in situ leaching (ISL) uranium (U) mines cause the pollution of groundwater. Phosphate (PO(4)(3-)) has the potential to immobilize U in groundwater through forming highly insoluble phosphate minerals, but the performance is highly restricted by low pH and high sulfate concentration. In this study, hydrogen peroxide (H(2)O(2)) and PO(4)(3-) were synergistically used for immobilizing U based on the specific properties of groundwater from a decommissioned acid ISL U mine. The removal mechanisms of U and the stability of U on the formed minerals were elucidated by employing X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy and kinetic experiments. Our results indicated that the removal of U by simultaneously adding H(2)O(2) and PO(4)(3-) was significantly higher than the removal of U by individually adding H(2)O(2) or PO(4)(3-). The removal of U increased with increasing PO(4)(3-) concentration from 20 to 200 mg L(-1) while decreased with increasing H(2)O(2) concentration from 0.003 to 0.3%. Specifically, the removal efficiency of U from groundwater reached 98% after the application of 0.003% H(2)O(2) and 200 mg L(-1) PO(4)(3-). Amorphous iron phosphate that preferentially formed at low H(2)O(2) and high PO(4)(3-) concentrations played a dominant role in U removal, while the formations of schwertmannite and crystalline iron phosphates may be also contributed to the removal of U. This was significantly different from the immobilization mechanism of U through the formation of uranyl phosphate minerals after adding phosphate. The kinetic experimental results suggested that the immobilized U had a good stability. Our research may provide a promising method for in situ remediating U-contaminated groundwater at the decommissioned acid ISL U mines.
期刊：
Science of The Total Environment,2023年863:160863 ISSN：0048-9697
通讯作者：
Xue, Xilong
作者机构：
[Zhang, Xiao; Ding, Dexin] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Min, Hengyang 421001, Hunan, Peoples R China.;[Zhang, Xiao; Ding, Dexin; Sun, Pengcheng; Xue, Xilong; Gu, Yuantong] Univ South China, Sch Resources Environm & Safety Engn, Hengyang 421001, Hunan, Peoples R China.;[Xue, Xilong] Jinchuan Grp Co Ltd, State Key Lab Comprehens Utilizat Nickel & Cobalt, Jinchang 737100, Gansu, Peoples R China.;[Xue, Xilong] Univ South China, Sch Resources Environm & Safety Engn, 28 Changsheng west Rd, Hengyang 421001, Peoples R China.
通讯机构：
[Xilong Xue] S;School of Resources, Environment and Safety Engineering, University of South China, Hengyang 421001, Hunan, China<&wdkj&>State Key Laboratory for Comprehensive Utilization of Nickel and Cobalt Resources, Jinchuan Group Co., Ltd., Jinchang 737100, Gansu, China
摘要：
Surface storage of uranium tailings presents a potential threat to the environment and human health. Cemented backfill can be used to dispose of tailings and control the ground pressure of stopes, providing a new approach for the in-situ seal of heap leaching uranium tailings (HLUTs). The backfilling characteristics of HLUTs were investigated by analyzing the release mechanism of sulfuric acid in HLUTs, the rheological properties of backfill slurry, as well as the strength development and microscopic characteristics of cemented HLUTs backfill (CUTB). The environmental effects of the CUTB were also assessed, and a novel filling process was presented. The results showed that the release rate of sulfuric acid in HLUTs decreased logarithmically, and the content of free sulfuric acid in coarse particles surfaces and ultrafine particles is high, which can be pretreated with 0.1 % quicklime. Slurry with a mass concentration of 74 % ~ 76 % can satisfy the requirements for pipeline transport. The CUTB's strength raised quickly in the former 90d, then decreased to a different extent after 150d, adding 50 wt% FA can enhance its later stability. The leaching level of uranium in CUTB cured for 28d is below the stipulated limit (GB 23727-2009) under different test conditions, having little impact on the underground environment. The hydration products of CUTB are mainly gypsum and C-S-H gel. Gypsum causes later degradation in strength; numerous C-S-H gels generated by the secondary hydration of FA enhance the resistance to sulfate corrosion. These findings have demonstrated that cemented backfill has a high inclusion ratio and low cost for HLUTs, which is of great significance to the HLUTs minimization and the safety of mining while promoting the environmentally friendly development of uranium mines and mills.
摘要：
In the traditional chlorination roasting-water leaching-solvent extraction process for the extraction of rubidium-bearing ore, Rb leaching from the ore and calcium removing from the leachate are conducted separately, and this results in the complicated process and high energy consumption. In order to integrate the Rb leaching and calcium removing processes, Rb-bearing polymetallic ore was firstly treated by chlorination roasting, it was then leached in a micro-reactor with raffinate, and the calcium ions in the leachate were removed in the reactor as carbonate precipitates by passing CO2 at certain pressure into the reactor. The effects of raffinate alkalinity, CO2 pressure, and CO2 reaction time on Rb leaching rate and calcium removing rate were investigated. The experimental results show that when Rb-bearing polymetallic ore was leached for 90 min by stirring with raffinate with 1.125-mol/L alkalinity, and the pulp was made to react with CO2 at 0.8 MPa for 15 min, the Rb leaching rate and calcium removing rate amounted to 92% and 98.2%, respectively. This integrated process including Rb leaching from Rb-bearing polymetallic ore and calcium removing from leachate could simplify the process for the extraction of Rb-bearing ore and increase its economic benefits.
作者：
Ding, Dexin;Zhang, Qi;Zhang, Hui;Li, Guangyue;Hu, Nan
期刊：
Journal of Cleaner Production,2022年363:132601 ISSN：0959-6526
通讯作者：
Nan Hu
作者机构：
[Ding, Dexin; Zhang, Hui; Zhang, Qi; Li, Guangyue; Hu, Nan] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Min, Hengyang 421001, Peoples R China.;[Ding, Dexin; Hu, Nan] Hunan Prov Key Lab Green Dev Technol Extremely Low, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Nan Hu] 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, Hunan, 421001, China
关键词：
Leachate of uranium tailings impoundment;Artificial wetland;Weak electric field;Enhancement effects;Phytoremediation
摘要：
Artificial wetlands (AWs) planted with Acorus Calamus L. and coupled with weak electric field (WEF) were constructed to investigate the effects of flow direction, hydraulic retention time (HRT), and WEF intensities on the removal of uranium and manganese from leachate of uranium tailings impoundment (LUTI), the distribution characteristics of the uranium and manganese in the AWs, and the growth and physiological responses of the plants in them. The results showed that the optimized removal rates of uranium and manganese from LUTI were observed to be 97.03% and 99.72%, respectively, in the upwelling AW planted with Acorus Calamus L. and coupled with WEF intensity of 0.3 V/cm when the HRT was 72 h. Compared with the group without WEF, the bioaccumulations of uranium and manganese by Acorus Calamus L were increased by 169.23% and 522.91%, respectively, the adsorption capacities of biofilms toward uranium and manganese were increased by 7.38% and 48.90%, respectively, the content of uranium in the substrates was decreased by 10.76%, while the manganese concentration had no significant difference, and the contents of uranium and manganese in the salt scale deposited on the cathode surface reached 51.20 and 653.11 mg/kg, respectively, when the WEF intensity was 0.3 V/cm in the AW. The applied WEF increased the activity of superoxide dismutase (SOD) and the content of glutathione (GSH), and reduced the content of malondialdehyde (MDA) in the leaves of Acorus Calamus L, so as to alleviate the stress of uranium and manganese on wetland plants in the AW. Therefore, the AW has potential application in the removal of uranium and manganese from LUTI.
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
摘要：
The efficient removal of uranium from radioactive wastewater is of great significance for the ecological environment safety and sustainable development of nuclear energy. Herein, the carbon dots modified porous graphitic carbon nitride (CNCD) was fabricated and used for photoreduction of U(VI) under visible LED light irradiation. The removal rate of U(VI) by CNCD-2 could reach more than 95 % over a wide range of U(VI) concentration. In addition, the CNCD-2 showed excellent selectivity and recyclability for photoreduction of U (VI). Further mechanism studies showed that the high photocatalysis activity of CNCD-2 was attributed to the effective separation of photoinduced electron-hole pairs, strong visible light absorption capacity and narrow bandgap. The U(VI) was activated by both photoinduced e(-) and center dot O-2(-) in the process of photoreduction, and then immobilized by transforming it to metastudtite ((UO2)O-2 center dot 2H(2)O). These results indicate that the CNCD is a promising material for remediation of uranium-containing wastewater under visible light irradiation.
期刊：
Environmental Science and Pollution Research,2022年29(1):1289-1300 ISSN：0944-1344
通讯作者：
Huang, T.;Du, J.
作者机构：
[Yu, Danni; Deng, Shihan; Liu, Longfei; Du, Jing; Huang, Tao] Changshu Inst Technol, Sch Mat Engn, Changshu 215500, Jiangsu, Peoples R China.;[Zhang, Shuwen] Univ South China, Nucl Resources Engn Coll, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Tao Huang; Jing Du] S;School of Materials Engineering, Changshu Institute of Technology, Changshu, China<&wdkj&>School of Materials Engineering, Changshu Institute of Technology, Changshu, China
通讯机构：
[Xixian Huang] S;School of Resource & Environment and Safety Engineering, University of South China, Hengyang, Hunan 421001, PR China<&wdkj&>Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling, South China University of Technology, Guangzhou, Guangdong 510006, PR China
摘要：
The reduction of soluble U(VI) to insoluble U(IV) by photocatalytic technology is considered to be a valid method to remove U(VI) from aqueous. Herein, g-C3N4/Ag/TiO2 Z-scheme heterojunction was synthesized for photocatalytic U(VI) reduction application. The SEM, XRD and XPS characterization results showed that the ternary g-C3N4/Ag/TiO2 composite photocatalyst was synthesized successfully. g-C3N4/Ag/TiO2 exhibited excellent photocatalytic reduction performance for U(VI) under visible light irradiation. After 30 min irradiation, the removal rate of U(VI) was above 99%. XPS indicated that the majority of U(VI) on the surface of g-C3N4/Ag/TiO2 was reduced to U(IV). In addition, the photocatalytic activity of g-C3N4/Ag/TiO2 has been kept significantly after five rounds of experiments, indicating the good stability. g-C3N4/Ag/TiO2 exhibited better photocatalytic reduction of U(VI) under visible light irradiation, which is mainly ascribed to Z-scheme photocatalytic mechanism assisted by the LSPR effect (Local Surface Plasmon Resonance). Ag with plasmon resonance effect on the loading has a strong absorption of photon energy. In addition, an intermediate charge transfer channel is formed between Ag and the semiconductor to inhibit the combination of photogenerated electrons and holes, resulting in a significant increase in the photocatalytic activity of the photocatalyst. This idea has some significance in design of other composite photocatalytic system.
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
作者：
Wang YongJian;Nie JiangTao;Lin JinRong;Pang YaQing;Wang ZhengQing;...
期刊：
岩石学报,2022年38(9):2865-2888 ISSN：1000-0569
作者机构：
[Nie JiangTao; Lin JinRong; Wang YongJian; Pang YaQing] Beijing Res Inst Uranium Geol, Beijing 100029, Peoples R China.;[Qin KeZhang; Wang YongJian] Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China.;[Qin KeZhang; Wang YongJian] Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China.;[Wang ZhengQing] Univ South China, Sch Nucl Resources Engn, Hengyang 421001, Peoples R China.
期刊：
Journal of Hazardous Materials,2022年424(Pt B):127441 ISSN：0304-3894
通讯作者：
Huang, Tao
作者机构：
[Song, Dongping; Li, Aiyin; Huang, Tao; Zhou, Lulu; Liu, Long-fei] 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.;[Tao, Hui] Chongqing Water Affairs Grp Co Ltd, 1 Longjiawan, Chongqing 400000, Peoples R China.;[Zhang, Shu-wen] Univ South China, Nucl Resources Engn Coll, Guangzhou 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：
*A dielectric barrier discharge configuration;*Binary equilibrium adsorption;*Contamination of Cs(+) and Sr(2+);*Non-thermal plasma;*Optimization;*Polyaluminum chloride
摘要：
The natural ecosystem will continually deteriorate for decades by the leakage of Cs and Sr isotopes. The exploration of the new materials or techniques for the efficient treatment of radioactive wastewater is critically important. In this study, a dielectric barrier discharge (DBD) configuration was constructed to operate the non-thermal plasma (NTP). The NTP was incorporated into the synthesis of polyaluminum chloride (PAC) in two different procedures to intensify the synthesis of PAC (NTP-PAC) and enhance the further removal of Cs and Sr from wastewater. The employment of NTP in two procedures both had significantly changed the physicochemical characteristics of PAC materials, which facilitated the further adsorption application of NTP-PAC on the treatment of Cs(+) and Sr(2+). Different molecular, morphological, and adsorption characteristics were confirmed to the NTP-PAC materials. The heterogeneous adsorption of the NTP-PAC can be appropriately fitted by both the pseudo-first-order kinetic model and the Elovich model. Both physisorption and chemisorption reaction mechanisms were ensured for the heterogeneous adsorption of the NTP-PAC material towards Cs(+) and Sr(2+), which guaranteed the excellent adsorption performance of NTP-PAC materials compared to PAC. The electron collisions caused by NTP with alum pulp created highly reactive growth precursors and intensified the nucleation and hydrolysis polymerization of PAC. The employment of NTP explicitly broadens the reaction pathways between PAC and cationic contaminants in the aqueous environment, which expands the application area of PAC materials in environmental sustainability.
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, People’s Republic of China<&wdkj&>School of Resource Environment and Safety Engineering, University of South China, Hengyang, People’s Republic of 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
摘要：
Herein, calcium peroxide modified mesoporous silica (CPMS) was successfully synthesized by a facile strategy and used for simultaneous adsorption and immobilization of U(VI) from uranium-containing wastewater. The batch uranium adsorption experiments reveal excellent adsorption performance of CPMS over a wide pH value. In comparison to calcium peroxide and mesoporous silica, the CPMS showed a great improvement in the removal capacity of uranium. As well, the pseudo-second-order model and Langmuir isotherm model provided a well description of adsorption kinetics and isotherm, respectively, which suggested the monolayer chemisorption governed the adsorption of CPMS for U(VI). In addition, the Langmuir isotherm model calculated the maximum adsorption capacity of CPMS for U(VI) up to 613.50 mg/g. Based on mechanistic studies of XPS, FT-IR, TEM and XRD, U(VI) is predominantly removed through synergistic adsorption of U(VI) by mesoporous silicon and immobilization of U(VI) by calcium peroxide as (UO2)O-2 center dot 2 H2O (metastudtite). Furthermore, the efficient removal ability of CPMS for U(VI) in uranium tailings leachate was confirmed by column test, the U(VI) con-centration of uranium tailings leachate can be reduced from 180.4 mu g/L to 2.3 mu g/L in 1895.2-bed volumes, which was well lower than the standard limit of WHO for U(VI) concentration in drinking water. This research provides a feasible approach and new idea for the efficient treatment of radioactive wastewater.
