JOURNAL OF MOLECULAR LIQUIDS
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2021
·
IF 6.165
Weiwei Chen,Yawen Cai,Zhimin Lv,Xin Wang,Jinghua Feng,Ming Fang,Xiaoli Tan
A magnetic metal organic framework was finely tuned by abundant amine groups (Mag MOF-NH 2 ) for the purpose of improving the U(VI) removal from solution. The Mag MOF-NH 2 displays outstanding removal capacity (80 mg⋅g −1 ) to U(VI) (10 ppm, 400 mL) within 15 min. To illuminate the adsorption mechanism of Mag MOF-NH 2 , the microstructure, the magnetic property, chemical composition of Mag MOF-NH 2 and the reaction system were characterized. The adsorption mechanism was systematically investigated. Equilibrium adsorption experiments verifies the improved adsorption capability from nearly 0 for MIL-101 to 82 mg⋅g −1 for Mag MOF-NH 2 , which could be explained mainly by the interaction between the amine groups and targeted ions. The effect of humic acid (HA) and coexisting ions on the U(VI) adsorption were also investigated. The Ca 2+ and Mg 2+ ions have passive impact on the adsorption and the high pH value can facilitate the process. Mag MOF-NH 2 holds great potential for the practical application owing to the outstanding U(VI) removal and satisfied regeneration in simulative wastewaters.
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iScience
·
2021
·
IF 5.458
Dejun Zeng,Liyong Yuan,Pengcheng Zhang,Lin Wang,Zijie Li,Youqun Wang,Yunhai Liu,Weiqun Shi
HKUST-1@CMC (HK@CMC) composites that show good acid and alkali resistance and radiation resistance were successfully synthesized by introducing carboxymethyl cellulose (CMC) onto the surface of HKUST-1 using a foaming strategy. For the first time, the composites were explored as efficient adsorbents for U(VI) trapping from aqueous solution, with encouraging results of large adsorption capacity, fast adsorption kinetics, and desirable selectivity toward U(VI) over a series of competing ions. More importantly, a hybrid derivative film was successfully prepared for the dynamic adsorption of U(VI). The results show that ∼90% U(VI) can be removed when 45 mg L −1 U(VI) was passed through the film one time, and the removal percentage is still more than 80% even after four adsorption-desorption cycles, ranking one of the most practical U(VI) scavengers. This work offers new clues for application of the Metal-organic-framework-based materials in the separation of radionuclides from wastewater.
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PubMed
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2025
·
IF 4.7
Rui Xu,Huiping Shao,Baoyu Li,Yufeng Zheng,Bing Wang,Juan Zhang,Hongquan Fu,Hejun Gao,Yunwen Liao
Due to its high mobility, biological toxicity, and radioactivity, U(VI) poses a serious threat to ecosystems and human health. To enhance the efficient removal of U(VI) under air atmosphere conditions without sacrificial agents, this work successfully synthesized a highly effective photocatalyst based on COFs featuring symmetric methyl structural units. This was achieved using relatively inexpensive materials as raw materials and leveraging the Schiff base reaction. The dosage of COFs at 0.2 g/L has been shown to achieve a removal efficiency of up to 98 % for 100 mg/L of U(VI). Following 5 cycles, the material maintains a percentage above 90 %, and the COFs exhibit a high degree of selectivity within high-salinity environments. The presence of a symmetric methyl group optimizes the electronic structure, enhances photoinduced charge separation, and improves redox activity. Additionally, it facilitates the generation of H 2 O 2 , which reacts in situ with U(VI) to form the insoluble compound (UO 2 ) O 2 ·2H 2 O. This work presents an innovative method for the cost-effective preparation of efficient non-metallic photocatalysts.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·
IF 3.5
Yanxue Yue,Weiyu Zhu,Alhadi Ishag,Bo Zhang,Yubing Sun
The natural clay mineral was activated using the acid treatment under ultrasonic conditions to improve its adsorption performance. The acid-activated clay (AAC) was investigated to remove Cr(VI) from wasted lubricant and U(VI) from aqueous solution by batch, spectroscopy, and modeling. Batch experiments showed that the isotherms and adsorption kinetics of Cr(VI)/U(VI) on AAC were satisfactorily followed by Frenudlich and the pseudo-second-order model, respectively. The decreased adsorption of U(VI) on AAC with the increase of ion strength indicated the outer surface complexation of U(VI) on AAC. The interaction mechanism of Cr(VI)/U(VI) on AAC was demonstrated to be surface complexation by oxygenated functional groups (e.g., hydroxyl) according to X-ray photoelectron spectroscopy (XPS) analysis. According to fitting of surface complexation models using three approaches, the adsorption of U(VI) on AAC at different pH can be better fitted by the double-layer model compared to the constant-capacitance model and triple-layer model. These findings are great important for the application of acid activated clay in the removal of heavy metals and radionuclides from the environment.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2016
·Vol. 309
·期 3
·1217-1226
·
IF 0.983
Dong Zhi-min,Qiu Yan-fang,Dai Ying,Cao Xiao-hong,Wang Lin,Wang Pan-feng,Lai Zhong-jun,Zhang Wen-long,Zhang Zhi-bin,Liu Yun-hai,Le Zhang-gao
For the selective adsorption of U(VI) from aqueous solutions, the hydrothermal cross-linking chitosan (HCC) and its phosphorylation production (HCC-TPP) were synthesized by hydrothermal reaction. The monolayer maximum capacity of HCC-TPP was improved from 200 mg g −1 of HCC to 409.2 mg g −1 at 298 K. Calculated thermodynamic parameters showed endothermic property of the adsorption process, while kinetic parameters indicated that the interaction followed pseudo-second kinetic model. Selective separation of U(VI) from effluent by HCC-TPP was achieved.
研究领域:
环境科学
·
吸附技术
·
核废料处理
·
水净化
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 14
·22073-22086
·
IF 0
Wang Youqun,Cai Weiqian,Xiong Lingshan,Pei Jiaying,Zhang Zhibin,Xu Lin,Liu Yunhai,Cao Xiaohong
Inspired by its large specific surface area, and tunable chemical and physical properties, a hollow carbon-based mater8ial derived from ZIF-8 with phosphate groups (HCM-PO 4 ) was prepared for the elimination of U(VI). The structural and surface features of HCM and HCM-PO 4 were thoroughly examined using techniques such as SEM, TEM, and XRD. The resulting carbon material, HCM-PO 4 , exhibits a higher BET surface area of 571.2 m 2 ·g -1 , featuring a hollow structure. The removal procedure of HCM-PO 4 for U(VI) aligns with the quasi-secondary kinetic model. Furthermore, the theoretical sorption capacity of HCM-PO 4 was found to be 482.30 mg·g -1 at 298.15 K. The results obtained from XPS, FT-IR, and EDS analysis of HCM-PO 4 after adsorption revealed the coordination of the phosphate group for U(VI), contributing significantly to the adsorption process. In brief, the HCM-PO 4 demonstrates excellent adsorptive ability, positioning it as a hopeful expectant to remove U(VI) from wastewater.
研究领域:
环境科学
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材料科学
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核废物处理
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吸附技术
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Ziqi Deng,Jian Gao,Yue Wang,Pengyang Deng,Yifan Zhang,Lianhua Zhao,YuShu Huang
In this paper, ZIF-67/PP hybrid membrane (ZIF-67-N) is prepared by in situ synthesizing ZIF-67 on polymer membranes for rapid extraction of U (VI) from water. The effects of pH, contact time, and concentration of U (VI) on the adsorption of ZIF-67-N are investigated. The adsorption isotherm and kinetics analysis show an extremely high adsorption capacity of 1334.8 mg/g of ZIF-67-N which is 5.36 times higher than that of ZIF-67, and a rapid adsorption equlibrium of 20 min that is 12 times faster than ZIF-67. The adsorption process is consistent with the Freundlich isotherm equation and pseudo-second-order rate equation . ZIF-67-N also exhibits good selectivity for U (VI) in simulated seawater . The high adsorption performance of ZIF-67-N is attributed to the membrane structure that improves the utilization of coordination sites including Co-OH, C-N, and C N. To our knowledge, ZIF-67-N achieves the highest adsorption capacity among reported MOFs materials. This work provides a kind of efficient adsorption materials for rapid U (VI) extraction, which will be conducive to promoting the development of U (VI) extraction technology.
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APPLIED RADIATION AND ISOTOPES
·
2022
·
IF 1.787
Yunyun Bao,Yan Liu,Changfu Wang,Yun Wang,Dingzhong Yuan,Jianda Xu,Zuqing Zhu,Yan He,Jinbiao Liu
The adsorption and recovery of uranium from wastewater is of positive significance to the development of nuclear industry and environmental remediation. The ternary polymer (PZS-co-TA) was prepared from hexachlorocyclotriphosphazene (HCCP), 4,4-sulfonyldiphenol (BPS) and tannic acid (TA) under ultrasonic . TAC was then obtained after carbonization under high temperature from PZS-co-TA. The structure and performance of TAC were analyzed using SEM , EDS, FT-IR, XRD, Raman, BET and TG. The adsorption capacity of TAC for uranium under different static adsorption conditions was investigated. The adsorption process was more consistent with pseudo-second-order model. The maximum adsorption capacity calculated by non-linear Langmuir model was 492.5 mg/g at pH 5.5. The thermodynamic values suggested that the adsorption process was spontaneous and endothermic. Moreover, after five cycles of adsorption-desorption tests, TAC remained effective at adsorbing uranium, implying the introducing of TA to the precursor (PZS-co-TA) could enhance the adsorption capacity for uranium.
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PubMed
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Di Zhang,Bing Zhao,Lijie Liu,Hao Tang,Xiangxue Wang,Shujun Yu
Although two-dimensional transition metal carbides and carbonitrides (MXenes) are becoming increasingly popular in contaminant remediation field, the preparation of MXene nanosheets that can efficiently eliminate the target pollutants still deserves in-depth investigation. Here we produced amidoxime Ti 3 C 2 T x nanosheets (TC-AO), which were efficient radionuclide adsorbents with high stability and positive affinity, by introducing the amidoxime group into the Ti 3 C 2 T x MXene surface through grafting by diazonium salt. The high stability and abundant functional groups of TC-AO were demonstrated by different characterization techniques such as scanning electron microscope (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analyzer (TGA), and X-ray photoelectron spectroscopy (XPS). Multiple factors affecting the radionuclide removal performance were explored, including reaction time, temperature, pH, ionic strength, anions and cations. The experimental results demonstrated that the radionuclide uptake by TC-AO was a heat-absorbing, spontaneous single-molecule chemisorption process and was consistent with the pseudo-secondary and Langmuir models. When pH < 6, the mechanism of uranium removal was inner complexation, and as the pH continued to increase, uranium removal shifted to outer complexation. Furthermore, the results certificated that TC-AO exhibited fast reaction kinetics (reaching equilibrium in about 20 min), excellent removal efficiency (279.57 mg U·g −1 and 73.99 mg Eu·g −1 ), outstanding selectivity and good stability. The studies showed that TC-AO had good stability and functionality, which was not only valuable for the design of MXene based adsorbents, but also provided a meaningful option for the extraction of radioactive pollutants from wastewater.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2023
·Vol. 332
·期 7
·2759-2770
·
IF 1.6
Li Xiuxin,Ouyang Jiafeng,Zhang Pengcheng,Wang Degao,Zhang Lei,Yuan Liyong,Liang Tongxiang,Chai Zhifang,Shi Weiqun,Wang Lin
Novel sandwich-like ZnIn 2 S 4 /Ti 3 C 2 composites with strong interfacial coupling were prepared by a facile solvothermal approach for U(VI) photocatalytic reduction immobilization. The integration of Ti 3 C 2 nanosheets into ZnIn 2 S 4 hierarchical structures endowed the composite outstanding photocatalytic performance through improving the utilization of solar energy and boosting the separation of photogenerated electrons and holes, evidenced by a fast reaction rate of 0.0247 min −1 , which was 3.20 times of that for pristine ZnIn 2 S 4 . The corresponding U(VI) removal efficiency of 50 ppm U(VI) solution reached 96.1% under visible light irradiation without sacrificial agents. In addition, the excellent stability and reusability of ZnIn 2 S 4 /Ti 3 C 2 has been demonstrated. Graphical Abstract Sandwich-like 2D/2D ZnIn 2 S 4 /Ti 3 C 2 composite for highly efficient photocatalytic reduction of U(VI)
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CELLULOSE
·
2021
·Vol. 28
·期 9
·5241-5256
·
IF 5.044
Zhou Qian,Chen JunJie,Jin Bo,Chu Shijin,Peng Rufang
MOFs are confined to solid supports to overcome their inherent disadvantages of lightweight and submicron size, which pose challenges to the adsorption operation. ZIF-8 nanoparticles can be loaded onto bacterial cellulose (BC) in a simple manner, and subsequently carbonized at 700 °C to obtain a larger specific surface area (expressed as BC@ZIF-8 carbon aerogels (BZCA). SEM indicates that ZIF-8 was successfully self-assembled on bacterial cellulose. Various characterization techniques (SEM, TEM, FT-IR, XRD, BET, and XPS) indicated that BZCA had been successfully prepared, with a large specific surface area (220.45 m 2 /g) and sufficient functional groups (-NH-, -OH, Zn–O, N–O, and C = N-). The relationship of the adsorption of BZCA to UO 2 2+ with both contact time and initial concentration was then studied. Results showed that the adsorption of UO 2 2+ followed a pseudo-second-order kinetic model (R 2 = 0.999). After calculation, the maximum adsorption capacity of BZCA was 535 mg/g, which was comparable to or better than that of other adsorbents. The kinetic analysis disclosed that 70 min was enough for BZCA to reach the adsorption equilibrium. The adsorption mechanism of the prepared adsorbent on UO 2 2+ was studied by FTIR and XPS.
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KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2020
·Vol. 37
·期 5
·776-783
·
IF 2.69
Liu Xinghao,Hu Shuheng,Xu Di,Shao Dadong
Uranium (VI), as a toxic contaminant, is a potential detriment to human health and environmental safety. In this experiment, carboxymethyl cellulose/Ca-rectorite composite material (Ca-REC/CMC) was prepared by crosslinking reaction to remove U(VI) from the liquid. The crystal structure was detected by X-ray diffraction (XRD) and surface structure and morphology of the materials were investigated by scanning electron microscopy (SEM). The surface functional groups of prepared materials were detected by Fourier transform infrared spectroscopy (FT-IR). The adsorption capacity of Ca-REC/CMC improved obviously after being modified by CMC. The adsorption capacity of Ca-REC/CMC was closely related to ionic strength and pH. According to thermodynamic parameter calculation, the adsorption process was endothermic and spontaneous. Adsorption isotherms could be depicted perfectly by the Langmuir model. Ca-REC/CMC maintained stability and regeneration after recycling six times. The adsorption mechanism, including electrostatic interactions and ionic interaction, was investigated by the X-ray photoelectron spectroscopy (XPS). Ca-REC/CMC is considered as remarkable potential material for removing U(VI) from the water environment.
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