SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Junhan Luo,Qi Qing,Shuang Liu,Bo Liang,Jingyu Wang,Zhe Wang,Jing Chen,Yuexiang Lu
The efficient extraction and recovery of uranium from spent fuel is crucial for the sustainable development of nuclear energy. Pyrochemical reprocessing based on chloride molten salt electrolysis shows promise in addressing this challenge but still has several key issues remain unresolved. The non-contact microplasma gas electrode may be an ideal anode in this system, which can solve the problem of anode corrosion. Herein, we propose combining microplasma anodes with molten salt electrochemistry to explore the feasibility of separating U 4+ and UO 2 2+ from chloride molten salts and to investigate the effects of electrochemical parameters on the separation of U 4+ and UO 2 2+ . Experimental results demonstrate that microplasma anodes exhibit excellent performance in separating U 4+ and UO 2 2+ from molten salts to form Al-U intermetallic and UO 2 solids, respectively. The composition of the products and the deposition rate of the uranium were significantly influenced by electrolysis temperature and current, whereas the initial concentration of reactants had a minimal overall impact on the experiments. Under conditions of prolonged electrolysis, the microplasma anode achieves high separation efficiencies for both U 4+ and UO 2 2+ (>96 %).
研究领域:
核能工程
·
电化学
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产品关联
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2024
·
IF 5.5
Bing Zhao,Dedong Wu,Hairui Hou,Lijie Liu,Xiangxue Wang,Wen Yao,Shujun Yu
Background Zeolite imidazolium framework materials (ZIFs) had been extensively applied for U(VI) removal because of their superior structure, high porosity and large specific surface area. Nevertheless, ZIF-8 tended to accumulate in aqueous solution and it was hard to detach from water, resulting in a decrease in the removal performance. Therefore, it was necessary to conduct thermal modification treatment to solve the above problems. Methods The U(VI) removal capability of ZIF-8 was investigated in this study by subjecting it to various thermal modification temperatures (0 °C, 200 °C, 400 °C, 600 °C). The effect of thermal modification on the removal of U(VI) from ZIF-8 was investigated by a combination of macroscopic and microscopic experiments. Significant findings Macroscopic experiments revealed ZIF-8, ZIF-8-200, and ZIF-8-400 showed excellent removal efficiency, reaching reaction equilibrium rapidly (about 60 min). The adsorption kinetic and isotherm datum were more consistent with proposed second-order kinetic model and Langmuir model, confirming that removal process of U(VI) was mainly a single-molecule chemisorption reaction. The maximum removal amounts of ZIF-8, ZIF-8-200 and ZIF-8-400 were 470.5, 474.6 and 606.0 mg/g, respectively. Microscopic spectroscopic analysis revealed that there was a synergistic effect between the combination bonds in ZIF-8 during the adsorption reaction. Surface complexation and electrostatic interaction were the main mechanisms used by ZIF-8-400 to remove U(VI). This research offered theoretical guidance on the design of high-performance materials and the migration and transformation laws of radionuclides, which had significant theoretical significance for the future treatment of radioactive nuclides or other pollutants.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Jingwen Guan,Xiaomei Wang,Yemeng Chen,Hailong Zhang,Zongyi Li,Ao Li,Fuwan Zhai,Lanhua Chen,Lei Chen,Ximeng Li,Bin Chen,Yigong Xu,Xiao Dong,Wei Liu,Xing Dai,Shuao Wang,Juan Diwu
The internal contamination of uranium poses severe health risks to both professionals and the public in case of nuclear accidents due to its chemo- and radiotoxicity. Although chelation therapy has been considered the only practical treatment in emergencies, current clinical chelators show only limited efficacy for uranium. Herein, a recently designed lacunary selenotungstate polyoxometalate (Se6W45) was demonstrated as an effective therapeutic agent. In this construct, the open site in Se6W45 provides a suitable uranium binding environment, resulting in the selective removal of uranium from kidneys (85.87%) and femurs (39.81%) with an extremely low ligand/metal ratio of only 4:1. The redox active sites in Se6W45, primarily the incorporated selenium, were able to reduce the intracellular reactive oxygen species (ROS) to normal levels in NRK-52E cells exposed to uranium. This approach overcomes the disadvantages of the excessive use of current chelating ligands in the range from 100- to 1000-folds, avoiding the consequential depletion of heterogeneous cations, dysfunction of proteins, and/or acid–base imbalance. More importantly, it provides a synergistic antidotal therapy for uranium in reducing radiation damage and chemical toxicity.
研究领域:
放射生物学
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毒理学
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药理学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yanlin Chen,Qingyan Zhang,Xijun Fu,Shuaishuai Guo,Qingyi Zeng
Hydroxyapatite (HAP) has been recognized as an effective absorbent for uranium. Recognizing and revealing its fate in coordinating with uranyl ions (U(VI)) under various conditions are vital for its practical application. In this work, HAP nanoflowers were synthesized by a simple wet chemical method, and the immobilization properties of HAP on U(VI) and U(VI) phase transformation during immobilization process were investigated systematically using a host of experimental methods and advanced characterization techniques. The results show that HAP can effectively immobilize U(VI) at high concentrations (50–3000 mg/L), with a maximum U(VI) adsorption capacity (q) of 10,200 mg/g and a distribution ratio (K d ) higher than 1.16 × 10 5 mL/g. Under the presence of sufficient U(VI) and a pH around 1.5 ∼ 3.0, HAP can rapidly react with U(VI) to form Autunite (Ca(UO 2 ) 2 (PO 4 ) 2 ·3H 2 O) with a nanoflake morphology, which is demonstrated excellently long-term stability. A moderately low pH that enables form adequately free calcium ions and phosphate groups via hydrolysis of HAP is essential to the mineralization of U(VI). This work is expected to pave the way for the use of HAP to develop highly efficient immobilization agents for the remediation of uranium-contaminated scenes and presents a comprehensive insight into the mechanisms of long-term U(VI) stabilization.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Nan Zhang,Wenze Li,Jinfeng Li,Qianwen Wang,Baochang Li,Jianwei Zhang,Tao Zhang,Zhigang Li,Yaorui Li,Bo Tian,Hongtao Zhao
Cellulose-based hydrogel materials have emerged as a highly promising candidate for the adsorption and removal of uranium from aqueous solutions. However, the subpar mechanical properties of cellulose hydrogels pose a significant obstacle to their practical implementation. In this study, a radiation-induced graft polymerization (RIGP) technique is employed to fabricate the hydrogel matrix, and subsequently, a phosphorylated modified cellulose-based hydrogel (PTCH) uranium adsorbent is synthesized through a one-step phytic acid modification process. Micro-Raman imaging is utilized to meticulously characterize and analyze the distribution and density of cross-linking domains within the hydrogel network. The findings reveal that the modified PTCH boasted both a loose chemical cross-linking network and a compact physical cross-linking network formed by hydrogen bond reconstruction, leading to a remarkable enhancement in its mechanical properties. It exhibits a compressive strength of up to 0.13 MPa and a strain of 49.20 %. Concurrently, the U(VI) adsorption performance of the hydrogel is investigated. The synergistic complexation effect of phosphate and carboxyl groups on U(VI) substantially augment the adsorption capacity of the hydrogel, with a theoretical maximum adsorption capacity for U(VI) reaching 449.5 mg·g −1 . In summary, PTCH effectively overcomes the limitations of traditional cellulose-based adsorbent materials, presenting a novel avenue for the development of cost-effective and efficient uranium adsorbents.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2023
·Vol. 332
·期 6
·1743-1754
·
IF 1.6
Zhu Kaihao,Xian Han,Peng Lin,Wang Shuiyun,Chen Chunning,Liu Jinxiang
A molybdenum disulfide/biochar (MoS 2 /BC) composite was synthesised by a facile hydrothermal process and used for the adsorption of U(VI) from aqueous solution through batch experiments. Results showed that MoS 2 /BC exhibit a saturated adsorption capacity of 451.3 mg/g at pH = 5, t = 60 min, T = 298 K, M/V = 0.02 g/L, C U(VI) = 10 mg/L, which was higher than that of MoS 2 and biochar. The process of MoS 2 /BC for U(VI) adsorption was better simulated via the pseudo-second-order kinetic model ( R 2 = 0.999) and Langmuir isotherm model ( R 2 = 0.999). The adsorption mechanism of U(VI) includes chemical adsorption, electrostatic attraction, surface complexation of oxygen-containing functional groups, cation- π bond and coordination of S group. After five adsorption–desorption experiments, the elimination rate remained above 80%.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2024
·
IF 1.5
Liu Nana,Xu Yunan,Zhan Chenghua,Li Yahe,Yuan Yijun
Uranium extraction from seawater is urgently required for the sustainable development of nuclear industry. Herein, the application potential of Thalassiosira pseudonana adsorbing U(VI) was examined. A 0.3 g L −1 adsorbent dose at an initial uranium concentration of 8 ppm, pH 5.0, and a contact time of 8 h achieved maximum U(VI) adsorption (23.75 mg g −1 ) at 298 K. The adsorption process was a chemisorption phenomenon, characterized by homogeneous monolayer adsorption. The adsorbents exhibited high hydrophilicity, with –OH and –COOH being the main functional groups for uranium adsorption. T. pseudonana had excellent regeneration performance and high sorption selectivity. The research denoted T. pseudonana is an effective and promising sorbent for extracting uranium from seawater.
研究领域:
海洋生物学
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环境科学
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核能技术
✓ 已验证
DOI
高影响因子
Biochar
·
2023
·Vol. 5
·期 1
·1-16
·
IF 12.7
Liu Fenglei,Wang Shanshan,Zhao Chaofeng,Hu Baowei
Herein, a biochar-based composite (Ti 3 C 2 T x @biochar-PDA/PEI) was constructed by decorating Ti 3 C 2 T x and polydopamine on coconut shell biochar via electrostatic self-assembly method. Different characterization techniques were applied to explore the structure, morphology and composition of the sorbents. It was found that the higher porosity and diverse functional groups were conducive for Ti 3 C 2 T x @biochar-PDA/PEI to capture radionuclides, and the water environmental conditions made a great contribution to the adsorption process. The process of removing U(VI)/Cs(I) well complied with the Langmuir isotherm and Pseudo-second-order equations, which indicated that the single layer chemical adsorption occurred on the solid liquid interface. Meanwhile, this produced composite exhibited superior removal performance under complex co-existing ion environment, and the maximum adsorption amounts of U(VI) and Cs(I) reached up to 239.7 and 40.3 mg g −1 . Impressively, this adsorbent still exhibited good adsorption performance after three cycles of regeneration. The spectral analysis and DFT calculation demonstrated that adsorption of U(VI) might be a chemical process, while the adsorption of Cs(I) should be ion exchange or electrostatic attraction. This study demonstrated the potential application of Ti 3 C 2 T x @biochar-PDA/PEI as an effective remediation strategy for radioactive wastewater cleanup. Graphical Abstract
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
Frontiers in Chemistry
·
2019
·
IF 3.782
Liu Lijuan,Yang Weiting,Gu Dongxu,Zhao Xiaojun,Pan Qinhe
With the rapid growth of nuclear power generation and fuel processing, the treatment of nuclear industry wastewater has become a major problem, and if not handled properly, it will pose a potential threat to the ecological environment and human health. Herein, a chitosan (CS)/ZIF-8 composite monolithic beads with ZIF-8 loading up to 60 wt% for U(VI) removal was prepared, which can be easily removed after use. It possesses a very high adsorption capacity of 629 mg•g−1 at pH = 3 for U(VI) and a well recyclability is demonstrated for at least four adsorption/desorption cycles. X-ray photoelectron spectroscopy (XPS) was carried out to study the adsorption mechanism between uranium and adsorbent, and the chelation of U(VI) ions with imidazole, hydroxyl, and amino groups was revealed. This work shows that CS/ZIF-8 composite can be used as an effective adsorbent for uranium extraction from aqueous solution, and has a potential application value in wastewater treatment.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2017
·Vol. 312
·期 2
·187-198
·
IF 1.282
Zheng Zhiyang,Wang Youqun,Zhao Wuwei,Xiong Guoxuan,Cao Xiaohong,Dai Ying,Le Zhanggao,Yu Shenglong,Zhang Zhibin,Liu Yunhai
Hydrothermal carbon spheres (HCSs) functionalized with 4-aminoacetophenone oxime group (HCSs-oxime) were prepared by a grafting method and explored to adsorption of uranyl ions from aqueous solution. The results of FT-IR, elemental analysis and zeta potential indicate a successfully modification with oxime group. The adsorbent shows an excellent adsorption capacity (Langmuir, q
m
= 588.2 mg g −1 ) and quick adsorption kinetic (equilibrium time of approximately 60 min) at optimal pH of 6.0. The adsorptive selectivity for uranyl ions has been also great improved in present with various co-existing ions. Overall, HCSs-oxime is a potentially promising material for selective removal of uranium in the contaminated solution.
研究领域:
环境科学
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材料科学
·
核化学
·
水污染治理
·
功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2017
·
IF 4.233
Ning Pan,Long Li,Jie Ding,Ruibing Wang,Yongdong Jin,Chuanqin Xia
A novel approach for facile covalent functionalization of graphene oxide (GO) was proposed in the present study in order to effectively avoid necessary anhydrous conditions and the usage of harsh reagents during the chemical functionalization of GO. Herein, a GO derivative that was functionalized with a primary amine derivative bearing a positively charged quaternary ammonium group, GO-S, was synthesized through a Schiff base condensation reaction between the amine groups of the primary amine derivative and the aldehyde groups of GO. The introduction of the quaternary ammonium groups can prevent GO from stacking and improve the dispersibility of GO after modification. The formation of imine bonds ( N CH ) between the primary amine and GO has been confirmed by Fourier transform infrared and X-ray photoelectron spectroscopy. The GO-S demonstrated good dispersion stability in aqueous medium and also exhibited better adsorption performance than GO for Th(IV) and U(VI), with a maximum thorium adsorption capacity of 2.22 mmol/g and a maximum uranium adsorption capacity of 0.83 mmol/g, suggesting a great potential for the application of graphene oxide-based materials for facilitating the removal of Th(IV) and U(VI) from nuclear waste solutions.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 110
·108662-108667
·
IF 3.289
Jin-Xiu Cao,Yong-Sheng Wang,Jin-Hua Xue,Yan-Qin Huang,Ming-Hui Li,Si-Han Chen,Bin Zhou,Xian Tang,Xiao-Feng Wang,Yu-Feng Zhu
We report on a novel and highly sensitive strategy for UO22+ detection. The designed single-labeled hairpin signal probe (SSP) was employed as a reporter, and a multipurpose RNA-cleaving DNAzyme as a target recognition element, catalytic DNAzyme and the primer of substrate fragment recycling amplification. The presence of UO22+ results in the substrate strand in DNAzyme being cleaved at the RNA site, releasing short substrate fragments. The fragment that is complementary partially with SSP could open the hairpin of SSP to form a double-stranded DNA with recessed 3′-termini, which could be selectively digested by exonuclease III. After the double-stranded DNA is fully consumed, the substrate fragment is released. This one could hybridize with another SSP to initiate the next round of digestion by exonuclease III. The recycling of substrate fragments can be repeated multiple times, resulting in the accumulation of the more 6-carboxyfluorescein in the solution along with an amplified fluorescence signal. By this strategy, we achieved hitherto an unreported UO22+ detection limit of 2.4 pM. Therefore, this novel exonuclease III-amplified strategy has great potential for highly sensitive and selective quantification of UO22+ in biomedical research and environmental science fields.
研究领域:
生物化学
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环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）