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.
摘要：
The uraniferous caustic sludge (UCS) produced in the production of uranium fuel components was hardly to leach directly, due to its very low-grade uranium(<10%). A two-step operation, consisting of the three-stage countercurrent dissolution and subsequent H2SO4 curing processes, was conducted to deal with UCS. The results of the three-stage countercurrent dissolution process showed that the uranium content in UCS was decreased from 8.66 to 1.06%, the residual ratio was less than 18%, and the leaching rate of uranium was 98% or more. The results of H2SO4 curing process showed that the leaching rate of uranium could be controlled at more than 99.9%, and the uranium content of UCS was decreased to 0.19%. The process may serve the purpose of recovering uranium from uranium-containing alkaline residues with complex source.
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 bioore 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.
通讯机构：
Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang, China
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;[丁德馨; 张丹; 张悦; 马建洪; 谭国炽; 胡南; 张辉; 张琪] 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, 421001, China
通讯机构：
[Ding, D.] K;[Ding, D.] H;Hunan Province Key Laboratory of Green Development Technology for Extremely Low Grade Uranium ResourcesChina;Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, China
通讯机构：
[Liu, Jinxiang] H;Hunan Provincial Key Laboratory of Pollution Control and Resources Technology, University of South China, Hengyang, 421001, China.;Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang, 421001, China.
期刊：
Journal of Radioanalytical and Nuclear Chemistry,2021年329(2):679-693 ISSN：0236-5731
通讯作者：
Yongjun Ye
作者机构：
[Ye, Yongjun; Wang, Zhongkun] Univ South China, Sch Resource Environm & Safety Engn, Hengyang 421001, Hunan, Peoples R China.;[Ye, Yongjun] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Yongjun Ye] S;School of Resource Environmental and Safety Engineering, University of South China, Hengyang, China<&wdkj&>Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang, China
摘要：
Soil samples were collected at 30 sampling points distributed evenly in Guangyao Village, South China to determine the radioactivity level around a monazite tailings pond via gamma spectrometry with an HPGe detector. The result of mean radioactivity concentration +/- standard deviation of radionuclides Ra-226, Th-232 and K-40 in the soil were 26.84 +/- 4.36,8.87 +/- 0.93 and 453.81 +/- 99.95 Bq kg(-1), respectively. Shapiro-Wilk normality test results show Ra-226 and Th-232 radioactivity concentrations consistent with normal distributions. The natural radioactivity level in the soil was evaluated by Radium equivalent activity (Ra-eq), Absorbed dose rate (D-r), Annual effective dose equivalent (AEDE), Gamma level index (I-gamma), Annual gonadal dose equivalent (AGDE), Internal Hazard Index (H-in) and External hazard index (H-ex). The radionuclides and radioactive hazard parameters were also statistically analyzed. A spatial distribution map of radionuclides was generated with a geographic information system and subjected to correlation analysis, principal component analysis and cluster analysis of radionuclides and radioactive hazard parameters. The results show that the radioactivity level in the soil of Guangyao Village is lower than the world average and recommended value, suggesting that it poses no significant threat to local residents. This work may provide baseline data for future soil radioactive environmental monitoring.
作者机构：
[Liu, Wanhui; Junjun, Tao; Song, Dongping; Huang, Tao] Changshu Inst Technol, Sch Mat Engn, Changshu 215500, Jiangsu, Peoples R China.;[Liu, Wanhui; 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.;[Yin, Li-Xin] Changshu Inst Technol, Sch Econ & Management, 99 South 3rd Ring Rd, Changshu 215500, Jiangsu, Peoples R China.;[Zhang, Shuwen] Univ South China, Nucl Resources Engn Coll, Hengyang 421001, Peoples R China.
通讯机构：
[Yin, Li-Xin; Liu, Wanhui; Junjun, Tao] S;School of Materials Engineering, Changshu Institute of Technology, 215500, China. Electronic address:;Suzhou Key Laboratory of Functional Ceramic Materials, Changshu Institute of Technology, Changshu 215500, China. Electronic address:;School of Economics and Management, Changshu Institute of Technology, No. 99, South 3rd Ring Road, Changshu 215500, China. Electronic address:
关键词：
Electrochemical reduction;Microbial fuel cell;Permeable reaction barrier;Spent lithium-ion battery;Synchronous recovery of Co and Li
摘要：
A bio-electrochemically (BE) recycling platform was assembled to recover Li and Co from the cathodic materials of spent LIBs in one integrated system. The BE platform consists of three microbial-fuel-cell (MFC) subsystems, including MFC-A, MFC-B, and MFC-C. Co and Li were smoothly recovered from the cathodic materials in the assembled platform. The initial pH and the loading ratios of LiCoO2 both significantly influenced the leaching efficiencies of Li and Co in MFC-A. Approximately 45% Li and 93% Co were simultaneously released through the reduction of LiCoO2 at the initial pH of 1 and the loading ratios of LiCoO2 of 0.2 g/L. The (NH4)(2)C2O4-modified granular activated carbons (GAC) with a thickness of 1.5 cm was favorably stacked adjacent to the cathode of the MFC-B system. About 98% of removal efficiency (RECo1) and 96% of recovery efficiency (RECo2) of Co were achieved in MFC-B under optimum conditions. The dosing concentration of Li+ lower than 2 mg/L and the (NH4)(2)CO3 of 0.01-0.02 M were conducive to enhancing the recovery of Li from raffinate and guaranteed the higher power output and coulombic efficiencies in MFC-C. The continuous release of CO2 caused by exoelectrogenic microorganisms on the biofilm facilitated the precipitation of Li2CO3. (C) 2021 Elsevier Ltd. All rights reserved.
期刊：
Desalination and Water Treatment,2021年215:147-159 ISSN：1944-3994
通讯作者：
Huang, T.
作者机构：
[Liu, Longfei; Huang, Tao] Changshu Inst Technol, Sch Chem & Mat Engn, 99 South 3rd Ring Rd, 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 & Technol, Xuzhou 221116, Jiangsu, Peoples R China.;[Zhang, Shuwen] Univ South China, Nucl Resources Engn Coll, Hengyang 421001, Peoples R China.
通讯机构：
[Huang, T.] S;School of Chemical and Technology, China;Suzhou Key Laboratory of Functional Ceramic Materials, China;School of Chemistry and Materials Engineering, No. 99, South 3rd Ring Road, China
摘要：
A microwave (MA) irradiation-persulfate-formate system was constructed to detoxify Cr contamination and solidify the geopolymerization of the alkali-activated composite material. Three series of experiments were correspondingly conducted to evaluate the treatment for the chromate-contaminated soil. The changes in the molar ratios of formate to persulfate and the mass rates of fortifier to soil led to a significantly greater reduction of CrVI in the detoxification experiments. The increase of blast furnace slag from 50% to 80% in the composite cementitious materials (CCM) intensified the immobilization efficiencies of chromate and the compressive strengths of geopolymer blocks. MA irradiation potentially enhanced the binding of Ca cations to the aluminosilicate compounds. The degree of reaction in the phenomenological kinetics model mathematically verified the geopolymerization process. Ettringite was formed within the structure of the geopolymer in the coupling system. Sulfate radicals released from persulfate not only contributed to the detoxification process but also strengthened the immobilization process.
期刊：
Colloids and Surfaces A: Physicochemical and Engineering Aspects,2021年628:127314 ISSN：0927-7757
通讯作者：
Tao Huang
作者机构：
[Li, Aiyin; Huang, Tao; 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：
[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：
Cesium;Composite aluminosilicate materials;Hydroxysulfate green rust;Recyclability;Selectivity
摘要：
The ecological hazards caused by the radioactive cesium (Cs) contaminants are long-standing and field-wide. In this study, the green rust (GR) was chemically formed and loaded onto the composite aluminosilicate materials (CAM) to enhance the adsorption capacities, environmental adaptability, and recyclability of CAM materials (GR-CAM) for Cs+ removal. The maximum monolayer adsorption capacities (mg/g) of GR-CAM for Cs+ adsorptions at pH of 2, 7, and 12 were 67.11, 104.93, and 129.03, respectively. The suitability of the pseudo-first-order kinetic model and Langmuir model for predicting Cs+ removal efficiencies and describing the isothermal fittings were observable and provable. Cs+ ions rebalanced the structural charge of GR-CAM by replacing some monovalent or divalent cations in mineral structures. The chemical loading of GR diversified the micromorphologies of CAM in different pH environments during the heterogeneous adsorption. The modification of GR strengthened the role of ion exchange in increasing the adsorption of Cs+ into GR-CAM. The excellent immobilization of Cs+ ions in GR-CAM in an alkaline environment was attributed to the formation of composite geopolymers. The different pH environments induced different adsorption mechanisms of GR-CAM towards Cs+ ions due to the sandwich structure of GR-CAM such as ion exchange, inner transferring, chemisorption, and co-precipitation.
期刊：
Journal of Materials Research and Technology,2021年11:618-632 ISSN：2238-7854
通讯作者：
Dongping Song<&wdkj&>Tao Huang
作者机构：
[Liu, Ao; Liu, Yu-Qing; Gu, Yi-Fan; Song, Dongping; Huang, Tao; Fang, Qing; Liu, Long-Fei] Changshu Inst Technol, Sch Mat Engn, 99 South 3rd Ring Rd, Changshu 215500, Peoples R China.;[Song, Dongping] Hunan Univ Sci & Technol, Hunan Prov Key Lab Safe Min Tech Coal Mines, Xiangtan 411201, Peoples R China.;[Huang, Tao; Liu, Long-Fei] 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：
[Dongping Song; Tao Huang] S;School of Materials Engineering, Changshu Institute of Technology, No. 99, South 3rd Ring Road, Changshu, 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<&wdkj&>School of Materials Engineering, Changshu Institute of Technology, No. 99, South 3rd Ring Road, Changshu, 215500, China<&wdkj&>Hunan Province Key Laboratory of Safe Mining Techniques of Coal Mines, Hunan University of Science and Technology, Xiangtan, 411201, China
摘要：
The potentiality on alkali activation of volcanic tuff with calcium-based materials, fly ash, and their mixtures as additives were comprehensively investigated in this study. Several characterization strategies have been employed for mechanism exploration. CaO and fly ash (FA) brought about more dramatic responses than CaSO4 and alkaline activator on activating the volcanic tuff-based geopolymer, which was relatively stable under the wetdry alternated conditions. The symmetrical stretching vibration of SieOeT (T = Al or Si) was right-shifted to the band at approximately 1036 cm(-1), implying the incorporation of Ca into SieOeT. FA accompanying with CaO enhanced the polycondensation, gelation, and hardening of geopolymer. However, too many quartz balls brought into geopolymer paste by an excessive amount of fly ash deteriorated the cementing quality and reduced the mechanical strengths. This work contributes to the module usage of volcanic tuff in the construction industries and supplies an innovative method in activating geopolymerization. (c) 2021 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
