JOURNAL OF ENVIRONMENTAL RADIOACTIVITY
·
2024
·
IF 1.9
Xiaoyu Yin,Yufan Zhao,Peng Guo,Peng Wu,Chao Chen,Aiming Zhang,Jiali Liao,Yuanyou Yang,Ning Liu,Tu Lan
The presence of carbonates or humic substances (HS) will significantly affect the species and chemical behavior of U(VI) in solution, but lacking systematic exploration of the coupling effect of carbonates and HS under near real environmental conditions at present. Herein, the sorption behavior of U(VI) on illite was systematically studied in the co-existence of carbonates and HS including both humic acid (HA) and fulvic acid (FA) by batch technique. The distribution coefficients ( K d ) increased as function of time and temperature but decreased with increasing concentrations of initial U(VI), Ca 2+ , and Mg 2+ , as well as ion strength . At pH 2.0–10.5, the K d values first increased rapidly and then decreased visibly, with its maximum value appearing at pH 5.0, owning to the changes in the interaction between illite and the dominant species of U(VI) from electrostatic attraction to electrostatic repulsion. The sorption was a heterogeneous, spontaneous, and endothermic chemical process, which could be well described by pseudo-second-order kinetic and Flory-Huggins isotherm models. When carbonates and HA/FA coexisted, the K d values always increased first and then decreased as a function of pH, with the only difference for HA and FA being the key pH (pH key ) at which the promoting and inhibiting effects on the sorption of U(VI) onto illite undergo a transition. The carbonates and HS have a synergistic inhibitory effect on the U(VI) sorption onto illite at pH 7.8. FTIR and XPS spectra demonstrated that the hydroxyl groups on the illite surface and in the HS were involved in U(VI) sorption on illite in the presence of carbonates. These results provide valuable data for a deeper understanding of U(VI) migration in geological media.
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高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2025
·
IF 3.5
Xun Li,Xuanying Lu,Bingtao Gui,Cheng Wang,Jun Liu,Liang Lu
Seawater uranium extraction is a key technology for environmental sustainability with significant potential applications. For the first time, this work synthesized a CTAB/Bent-MOF808 with strong stability, abundant coordination functional groups, and low cost, and assessed its adsorption effectiveness for U (VI) in carbonate solutions. The study explores how pH, contact time, uranium concentration, temperature, carbonate, halide salts, phosphorus, and Ca/Mg ions influence uranium adsorption, with a focus on mechanistic insights through characterization and modeling. Under optimal conditions (temperature of 25 °C, pH 8.0, with a sodium bicarbonate concentration of 2 mmol L −1 and a U(VI) concentration of 50 mg L −1 ), which are similar to the real seawater environment, CTAB/Bent-MOF808 demonstrated superior uranium adsorption performance compared to MOF808 and CTAB/Bent in U(VI)–CO 3 solutions. Under high initial pH, NaHCO 3 , Ca/Mg ions, and halide ion concentrations, the complex's uranium adsorption capacity and removal rate are reduced due to competitive adsorption between ions, as well as increased electrostatic repulsion on the surface. The sorption process was identified as monolayer homogeneous chemical adsorption process by analyzing it with quasi second order kinetic models and Langmuir isotherm models. The inhibitory effect of halide ions is as follows: I − > F − > Br − > Cl − . XPS suggested that the complexation of bromide anion with –COOH and electrostatic attraction could be crucial processes for uranium adsorption. This study offers theoretical insights into uranium extraction from natural uranium-bearing waters and highlights the expanded potential of MOF-based adsorbents in this process, enhancing both efficiency and application scope.
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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 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%.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2023
·Vol. 332
·期 4
·1303-1314
·
IF 1.6
Xiong Lingshan,Wang Youqun,Cui Wenzheng,Chen Lei,Luo Qie,Cao Xiaohong,Liu Yunhai
Amorphous titanium phosphates (ATP) doped with NH 4 + , K + , Na + , and Li + ions (ATP-M, M = NH 4 , K, Na, and Li) were prepared by a co-precipitation method. The SEM&EDS, TGA, XRD characterizations displayed that ATP-M was successfully synthesized, and the doping of NH 4 + , K + , Na + , and Li + ions did not change the crystal form of ATP. The results revealed that the optimum pH value for U(VI) extraction on ATP-M was determined to be 5.0. Moreover, the saturated adsorption capacity obtained by the Langmuir equation for ATP-NH 4 , ATP-K, ATP-Na, and ATP-Li was 505.1, 366.1, 273.3, and 144.1 mg g −1 , respectively. Furthermore, the interaction between ATP-M and U(VI) was discussed. In short, ATP-NH 4 may be an effective adsorbent to remove of U(VI) in wastewater due to its high adsorption ability.
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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
·
2025
·
IF 1.6
Zhang Yong,Liu Xuan,Jiang Kexing,Feng Jiaqi,Liu Yujia
In this study, peanut shell was used as the raw material to synthesize activated biochar-MnO composite (PSBC-K) using KMnO 4 as an activating agent. The Q max of U(VI) by PSBC-K was 569.8 mg/g, which was 3.9 times the Q max of PSBC (147.3 mg/g). Besides, PSBC-K exhibited good selectivity for U(VI) and excellent cycling performance. The removal mechanisms of U(VI) for PSBC-K were primarily dominated by electrostatic interaction, coordination reaction, precipitation and ion exchange. Overall, this work presented a sustainable and straightforward method for creating a novel adsorbent for efficient U(VI) separation.
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Separations
·
2025
·Vol. 12
·期 5
·106
·
IF 2.7
Xiaoyun Guo,Junli Wang,Yao Liu,Haojun Zhao,Hui Wang,Wentao Wang,Baole Li,Taihong Yan
Developing a new efficient separation ligand based on the “CHON” principle to address the limitations of phosphorus containing extractants in nuclear fuel reprocessing can help further simplify the process flow and reduce the amount of secondary waste. Building upon this critical need, a novel ligand was developed through a strategic application of the Hard and Soft Acids and Bases (HSAB) theory, integrating a soft donor nitrogen atom into the linear architecture of bis-diglycolamide. This groundbreaking ligand, named N,N′-bis[2-(2-(N,N-dioctylcarbamoyl)ethoxy)ethylacetamido]-N″-diethylenetriamine (TOMDEA-BisDGA), has demonstrated remarkable potential in the extraction of Pu(IV). The study unveils that the ligand demonstrates remarkable selectivity and separation efficiency towards Pu(IV) ions while maintaining an exceptionally low extraction capacity for U(VI) across a wide acidity spectrum of 0.1~6 mol/L. To explain the structure properties of complex formed by the ligand and Pu(IV), a systematic analysis was performed, including slope analysis, proton nuclear magnetic resonance (NMR) titration, and Fourier-transform infrared (FT-IR) spectroscopy. This study explores the coordination and separation behavior of diglycolamide ligands with actinide. This work is expected to provide important information and theoretical bases upon which advanced design and optimization of ligands for high-performance processes for the separation of plutonium might be carried out. Such findings will contribute to the understanding of actinide chemistry and further the design of improved separation methods for nuclear applications.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2016
·
IF 2.567
Kegang Wei,Qingliang Wang,Long Huang,Lei Sun
A mesoporous silica prototype (MSP) was produced by attaching SiO2 colloid to urea formaldehyde resin. Treatment of the MSP using different grafting methods yielded three different amino-functionalized mesoporous silica samples. The materials were characterized by scanning electron microscopy, energy-dispersive spectroscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, 13C nuclear magnetic resonance, zeta potential measurements, and isothermal N2 sorption/desorption. For a 1:2000 solid-to-liquid ratio, all adsorbents could almost completely remove uranyl from sulfate and carbonate solutions of 3.6 mg L–1 U(VI) at pH 3.5 to 5.5 and pH 6.5 to 9.5, respectively. The adsorption equilibrium time was less than 30 min. The adsorption equilibrium curve showed that the maximum sorption capacity was 117 mg L–1 at pH 4.0. Through the experimental adsorption, it was found that the most effective sample could reduce the U(VI) concentration from 3.6 mg L–1 to 0.79 μg L–1 with 99.98% removed. In desorption experiments, 0.1 mol L–1 nitric acid could desorb U(VI) almost completely from the adsorbent. However, this kind of adsorbent is unsuitable for use in high acid or alkaline environments.
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JOURNAL OF MOLECULAR LIQUIDS
·
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
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2025
·
IF 1.6
Chen Yanan,Sui Wenxuan,Peng Jianbiao,He Xindi,Zhu Kairuo
In this work, through the ball-milling treatment process, the novel micron-engineered Ulva prolifera (m- Ulva ) was prepared and used to remove U(VI) from water. The m- Ulva properties were interpreted by analysis of the morphology structure, specific surface area, functional groups, and composition. The adsorption experimental results testified that the U(VI) adsorption process depends strongly on pH, while followed the pseudo-second-order kinetic model and the Langmuir adsorption isotherm model. The maximum absorption capacity was shown to be 147.06 mg/g at pH 5.0 and 25° C. Based on various characterization, the related adsorption mechanisms mainly encompassed electrostatic attraction, complexation and partial reduction of U(VI). The study presents a green, scalable method to transform Ulva prolifera into low-cost, micron-engineered biomass material for U(VI)-contaminated wastewater cleanup.
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