JOURNAL OF SOLID STATE CHEMISTRY
·
2019
·
IF 2.291
Fuqiu Ma,Jinru Nian,Changlong Bi,Ming Yang,Chunhong Zhang,Lijia Liu,Hongxing Dong,Mingxin Zhu,Boran Dong
In this study, carboxylated graphene oxide (GO-COOH) was prepared via a simple and feasible method to enhance the adsorption of U(VI). GO-COOH were characterized by FT-IR, XRD and XPS technique, and then applied as the adsorbent for U(VI) ions removal from water. The effects of conditions for U(VI) adsorption, including initial pH of aqueous solution , adsorbent dose, contact time, and initial concentration of U(VI) solution were investigated. The result indicated that the maximum adsorption of U(VI) on GO-COOH was 315 mg/g at the optimum adsorption condition ( C a = 0.2 g/L, pH = 6.0, t = 6 h, C 0 = 100 mg/L and T = 25 °C), which was significantly higher than that on GO (190 mg/g) in the same condition. Compared to GO, the maximum U(VI) adsorption capacity of GO-COOH increases by 65.8%. The adsorption process was described well with pseudo-second-order kinetics and the Langmuir isotherm model, indicating the chemisorption process and monolayer adsorption process.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
You-qun Wang,De-jun Zeng,Xiao-hong Cao,Yin Dai,Hui-jie Ma,Yun-hai Liu,Zhi-bin Zhang
In this work, the functional group of salophen with high affinity to U(VI) was grafted to hydrothermal carbon spheres (HCSs) to improve the adsorptive ability for U(VI). Through the application of scanning electron microscopy, Fourier transform infrared, and zeta potential measurement, the micro-morphology, functional group, and surface charge of the adsorbents was characterized. Comprehensive investigation of the factors affected U(VI) adsorbed by HCSs and salophen group modified HCSs (HCSs-sal) were conducted. Different types of kinetic and thermodynamic models were utilized to explore the adsorption processes. The results of this study, indicated that the adsorption of U(VI) on HCSs-sal fitted well to Langmuir equations with the monolayer capacity of 332.51 mg g –1 . Furthermore, the adsorptive selectivity of HCSs for U(VI) was also remarkably enhanced after functionalization with the salophen group. Overall, HCSs-sal appears to have the potential to be a prospective candidate for the selective adsorption of U(VI).
研究领域:
环境科学
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材料科学
·
核化学
·
水处理技术
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DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2020
·Vol. 327
·期 1
·39-47
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IF 1.137
Liu Peng,Yu Qiang,Zhang Xu,Chen Jiaqi,Xue Yun,Ma Fuqiu
Amidoxime (AO) based adsorbents have been proposed as low cost and efficient adsorbent for U(VI). Herein, we present a simple strategy for preparing AO modified artificial zeolite. The composition and morphology of the materials have been confirmed via XRD, FT-IR, TGA and SEM. The AO-artificial zeolite was synthesised as an efficient adsorbent for adsorbing U(VI). The critical factors affecting U(VI) adsorption from aqueous solution were exploited, such as pH, contact time, temperature and adsorbent dosage. This study reveals AO-artificial zeolite, along with a low-cost, environmentally friendly and facile synthesis, can be regarded as a promising material for uranium-containing wastewater treatment.
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
Journal of Water Process Engineering
·
2024
·
IF 6.3
BingTao Gui,Jun Liu,Cheng Wang,Shilong Shi,Junxiang Shu,PingPing Ding,Juan Zhai,Changsong Zhao
CTAB/Bent-MOF-74 was synthesized via hydrothermal method to investigate its U(VI) sorption in carbonate solutions. Generally, CTAB/Bent-MOF-74 (∼87.6 mg·g −1 ) showed better sorption capacity than CTAB/Bent-MOF-71 (∼64.2 mg·g −1 ) and CTAB/Bent-CS-35 (∼81.4 mg·g −1 ) in U(VI)-Cl coexist carbonate solutions when pH = 8.0, [NaHCO 3 ] =2 mmol·L −1 , [NaCl] =0.1 mol·L −1 and [U(VI)] =50 mg L −1 . The competitive sorption between HCO 3 − /CO 3 2− , OH − , halide ions and U(VI) complexes ions as well as the weakened electrostatic attraction decreased the composite's uranium sorption efficiency and capacity at high pH initial , NaHCO 3 , phosphate, Ca/Mg and halide ions concentrations. The pseudo-second-order kinetics and Langmuir models indicated a monolayer homogeneous chemisorption process. Besides, 0.1 mol·L −1 HCl shows the highest desorption efficiency among the selected desorbents, and the sorption rate is still high even after four times of desorption. In particular, the decreasing inhibitory capacity of the halide ions was on the order of I − , F − , Br − , Cl − . Characterization analyzes confirmed the good structural stability and Br anion exchange as well as the -OH/-COOH coordination and electrostatic attraction, which could be the predominant sorption mechanisms of U(VI) by CTAB/Bent-MOF-74. The results provided theoretical references for understanding the uranium sorption in natural uranium-containing water and designing potential uranium-extracting materials.
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
JOURNAL OF SOLID STATE CHEMISTRY
·
2020
·
IF 2.726
Yanbing Sun,Yuanyuan Wei,Jiaying Pei,Huarui Nan,Youqun Wang,Xiaohong Cao,Yunhai Liu
Synthesizing highly efficient adsorbent materials to remove U(VI) from contaminated water remains a major challenge. Here, using UiO66-NH 2 as a sacrificial template, porous carbons (ZrO 2 @PCs) were prepared by high-temperature calcination , and then a simple strategy was used for phosphorylation modification to prepare the target product ZrO 2 @PCs-PO 4 . The microscopic surface morphology and structure of ZrO 2 @PCs-PO 4 characterized by SEM, FT-IR and XRD reveals that phosphate groups has been successful introduced on the surface of ZrO2@PCs-PO 4 . Batch experimentation showed that the phosphorylation process improves the adsorption behaviors , and the maximum monolayer adsorption capacity for U(VI) is 496.5 mg/g. The adsorption isotherms and kinetics were simulated to explore its adsorption mechanism. The excellent selectivity and reusability ensure this material could apply in selective removal of U(VI) ions.
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 CHEMICAL AND ENGINEERING DATA
·
2018
·
IF 2.196
Hao Lei,Ning Pan,Xiaoqiang Wang,Hao Zou
A novel phytic acid impregnated polyaniline (PA-PANI) was synthesized by a in situ polymerization and supermolecular self-assembly method and has been used as an adsorbent for efficient capture of U(VI) from aqueous solution. The structure and morphology of the adsorbent were well characterized. The influence of different factors such as pH value, ionic strength, contact time, initial U(VI) concentration and temperature on the adsorption of U(VI) onto PA-PANI-3 were carried out by batch adsorption experiments. The results demonstrated an enhanced U(VI) adsorption capacity of 86.6 mg/g for PA-PANI-3, greatly exceeding that of polyaniline (PANI, 8.8 mg/g). The adsorption process follows the pseudo-second-order kinetic and Langmuir isotherm models with the theoretical maximum adsorption capacity of 90.3 mg/g. According to the calculation from the Dubinin–Radushkevich isotherm model equation, it is suggested that the adsorption is mainly a chemical adsorption mechanism. U(VI) is adsorbed on PA-PANI-3 via the phosphoric acid, amine, and imine groups. The U(VI) can be desorbed from the U(VI) adsorbed PA-PANI-3 with a desorption efficiency of 90.8% by using 0.1 mol/L Na2CO3 solution. This study demonstrated that PA-PANI could be used as an efficient adsorbent for removal and recovery of U(VI) from aqueous solution.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2024
·
IF 4.4
Youwen Li,Lianghuan Wei,Changjin Ou,Qiong Wu,Zhipeng Liao,Xianghao Zha
Efficient removal of radioactive and toxic uranium (U) from wastewater is highly desired. In this work, a novel adsorbent was prepared via in situ introducing zeolitic imidazolate framework-8 (ZIF-8) onto the hydrolyzed biomass loofah sponge (HLS) for the removal of U (VI). Benefiting from the introduction of ZIF-8, the physical and chemical properties of the composite adsorbent were significantly improved, leading to an enhanced U (VI) adsorption capacity. The results show that the maximum adsorption capacity of the adsorbent toward U (VI) is 244.03 mg/g under the optimal conditions. The adsorption kinetic parameters and isotherm of U (VI) well follow the pseudo second order model and Langmuir model, respectively. Besides, the thermodynamic parameters shows that the adsorption process of U (VI) is a spontaneous process with an exothermic nature. More importantly, the prepared adsorbent has a good reuseability and anti-interference capability during the adsorption of U (VI). This work supplies a new routine to design highly performed adsorbents for the removal of U (VI).
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
SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Jiao Tang,Junxiang Tang,Hao Lei,Yong Chen,Jiang Zhao,Xiaoqiang Wang,Ning Pan
In this study, a novel, high surface area iron phosphonate (IP) for highly efficient adsorption of uranyl ion in acidic medium was described. The as-prepared IP was amorphous with its specific surface area and total pore volume as high as 268 m 2 /g and 1.04 cm 3 /g, respectively. Particularly, the as-prepared IP with ferrous ions and oxygen, nitrogen-bearing functional groups prove excellent U(VI) adsorption capacity (154.6 mg/g) as compared to that of amorphous FePO 4 (67.3 mg/g) and Fe 3 (PO 4 ) 2 (H 2 O) 8 (33.8 mg/g). Surprising, the saturation adsorption capacity could achieve up to 353.9 mg/g. Besides, the IP also had a fast adsorption rate for attaining adsorption equilibrium within 20 min, and followed pseudo-second-order kinetic and Freundlich models. Moreover, both the Dubinin-Radushkevich isotherm adsorption model and the value of enthalpy indicated a chemisorption process. Otherwise, the Na + -independent U(VI) adsorption on IP and the adsorption-desorption isotherm studies revealed that inner-layer surface complexation is the control step for U(VI) adsorption process, and the adsorbent featured an irreversible adsorption process. The structure and functional groups of the adsorbent remained unchanged after capture of U(VI). Further, X-ray photoelectron spectra (XPS) analysis demonstrated that the capture mechanism of U(VI) on IP from acidic aqueous solution was due to not only redox reaction, but also ascribed to the coordinated chemical adsorption.
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
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Jia Lei,Huanhuan Liu,Changpeng Yuan,Qiang Chen,Ji-An Liu,Fengchun Wen,Xinying Jiang,Wenjie Deng,Xudong Cui,Tao Duan,Wenkun Zhu,Rong He
The efficient, safe, and low-cost treatment of uranium-containing wastewater is still an urgent and meaningful problem. The uranium-containing wastewater system commonly contains a variety of soluble organics, which complex with hexavalent uranium (U(VI)) and thus increase the difficulty for U(VI) treatment. Herein, we introduced oxygen vacancy into WO 3 nanosheets to achieve highly efficient photocatalytic reduction of U(VI) and photo-degradation of organics. The WO 2.78 nanosheets showed U(VI) removal ratio of 95.6% with the reduction ratio of 84.5% in 8 mg/L of U(VI). Additionally, the maximum extraction capacity of U(VI) on WO 2.78 nanosheets reached 507.2 mg/g at 200 mg/L of U(VI). Meanwhile, the presence of excessive interfering ions and the cycle use of the WO 2.78 nanosheets hardly decreased the removal ratio of U(VI). The mechanistic study demonstrated that the introduction of oxygen vacancies not only broadened the response range of visible light, but also increased the adsorption of U(VI) over WO 3 nanosheets. Moreover, the decreased reduction potential of WO 2.78 nanosheets to U(VI) verified the enhanced photocatalytic activity of WO 2.78 nanosheets. Our work provided a successful example for the promotion of reduction efficiency toward U(VI) pollutants by the vacancy engineering in metal oxides.
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
APPLIED RADIATION AND ISOTOPES
·
2023
·
IF 1.6
Haibo Zhang,Yingqing Mai,Shuibo Xie,Guohua Wang,Shuiyun Wang
With sodium tripolyphosphate (STPP) as cross-linker, Persimmon tannin-chitosan microspheres (PT-CS) were synthesized by hydrothermal for removing U(VI) from acidic effluent. The batch experiments indicated that PT-CS adsorbed U(VI) most effectively at pH 1.5, the maximum adsorption capacity for PT-CS was 245 mg/g. Compared to pure CS dissolved at pH 3, PT-CS still maintain high stability at pH 1. Moreover, single system of common metal ions in rare earth wastewater only slightly affected the adsorption of uranium at pH 1.5, but this process was inhibited about 30% at pH 5. Those results indicated that the selectivity of PT-CS for uranium removal could be controlled by regulating the pH and there are excellent potentials for PT-CS using in acid metal water treatment. Its adsorption selectivity and ability to adapt different condition was demonstrated with uraniferous rare earth wastewater treatment. The adsorption for PT-CS to U(VI) were well fitted for both Langmuir isothern and pseudo-secondary kinetic model equations, and that meant chemisorption dominated the removal process. Spectroscopic analyses confirmed that the adsorption of U(VI) occurred via surface complexation by –OH and ion exchange with Na + . Therefore, this study provides a high-efficiency, low-cost, valuable and highly adaptable method for the treatment of acidic uranium-containing effluents.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
RADIOCHIMICA ACTA
·
2022
·Vol. 110
·期 5
·311-322
·
IF 2.083
Yun Zhou,Huai-Xin Hao,Tian-Hao Dong,Xu-Feng Ni,Yi-Chen Hu,Jia-Ju Ma,Jun-Qiang Yang,Ke-Liang Shi,Guo-Jian Duan,Tong-Huan Liu
With the rapid development of nuclear energy, how to safely and efficiently dispose of radioactive waste solution has become an urgent environmental problem of public concern. It is of great significance to construct a new type of high-efficiency adsorbent material to recover uranium from nuclear waste solution. In this work, the Ti 3 C 2 T x material (an emerging two-dimensional inorganic layered material) with a stable layered structure was used as the matrix, and the amidoxime functionalized MXene composite material (PAO/Ti 3 C 2 T x ) was synthesized by in-situ polymerization. The amidoxime-functionalized Ti 3 C 2 T x showed excellent capacity to capture U(VI), with a maximum adsorption capacity of 98.04 mg/g at 25 °C, which was significantly better than that of Ti 3 C 2 T x , and the adsorption selectivity for U(VI) was greatly improved. The adsorption was conformed to Langmuir isotherm model and pseudo-second-order kinetic model. In addition, the adsorbed UO22+ could be effectively desorbed by 0.1 M HNO3, and the adsorption performance of PAO/Ti 3 C 2 T x did not decrease significantly after 5 adsorption/desorption cycles. The results of ionic strength experiment, FT-IR, SEM, and XPS jointly indicated that adsorption mechanism of U(VI) on PAO/Ti 3 C 2 T x was the combined effect of the amidoxime group and -O and -OH active groups on the surface of Ti 3 C 2 T x , mainly inner complexation. These advantages make PAO/Ti 3 C 2 T x composite a highly potential U(VI) adsorbent with great application prospects.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2017
·Vol. 313
·期 1
·175-189
·
IF 1.282
Chen Haijun,Wang Youqun,Zhao Wuwei,Xiong Guoxuan,Cao Xiaohong,Dai Ying,Le Zhanggao,Zhang Zhibin,Liu Yunhai
The graphene oxide (GO) was functionalized with phosphate groups and applied as an effective adsorbent for the removal of uranium from aqueous solutions under various environmental conditions (e.g., solution pH, ions strength, contact time and temperature). Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy have confirmed that the phosphorylate group was successfully introduced on the surface of GO. The adsorption experiments indicated that the monolayer adsorption capacity has been increased from 249.38 mg/g (GO) to 336.70 mg/g [phosphorylated graphene oxide (PGO)] calculated by Langmuir model. Moreover, the adsorptive selectivity coefficients S
U(VI)/M(x) increase from 42.43 to 51.96% after functionalized with phosphate group. The mechanism of U(VI) absorbed on PGO surface was dominated by surface complexation and electrostatic interaction. The results demonstrate that PGO will be a promising material for the efficient removal of U(VI) in the environment pollution remediation.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）