JOURNAL OF SOLID STATE CHEMISTRY
·
2019
·
IF 2.291
Zhuo Dai Li,Huai Qiang Zhang,Xiao Hong Xiong,Feng Luo
Covalent organic frameworks (COFs) represent an exciting new type of porous organic materials, which are constructed with organic building units via strong covalent bonds . Here in, the COF-2,4,6-Triformylphloroglucinol p-Phenylenediamine (COF-TpPa-1) was synthesized by solvothermal method for the removal of U(VI) from aqueous solution. Effects of pH, adsorption dose, contact time, uranium solution concentration, temperature and adsorption and desorption cycle on the efficiency of COF-TpPa-1 removal of U(VI) are investigated. SEM, XRD , TGA and FT-IR were employed to characterize the samples and analyze adsorption mechanism. The results manifested COF-TpPa-1 has the high adsorption capacity ( q m = 152 mg/g), quick adsorption kinetic , high selectivity , outstanding recycle performance and good resistance to acids, bases and high temperature.
研究领域:
环境化学
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材料科学
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核化学
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污染治理
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吸附科学
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DOI
高影响因子
Materials
·
2026
·Vol. 19
·期 18
·3950
·
IF 3.7
Zenghui Wan,Xun Sun,Shuiyuan Zhang,Jun Yang,Long Yu,Chao Yuan,Jingshui Xu,Suhua Wang
The development of high-performance adsorbents with porous structure is very important for efficient uranium extraction from complex aqueous media. Here, porous poly (amidoxime)/poly (vinyl alcohol) (PAO/PVA) microspheres were fabricated by liquid nitrogen-assisted molding and subsequent vacuum freeze-drying procedures. The as-prepared composites with a PAO:PVA mass ratio of 4:1 have the superior adsorption capability at an optimal pH of 6. Its theoretical maximum adsorption capacity was estimated to be 330.2 mg g−1using the Langmuir model. It also exhibited good reusability for U(VI) uptake with a high capacity retention of more than 85% after five consecutive adsorption–desorption cycles. In simulated seawater containing competing ions, the PAO/PVA microspheres can preferentially capture U(VI), achieving the highest adsorption capacity of 5.06 mg g−1, largest distribution coefficient of 65.71 L g−1and greatest removal efficiency of 77%. The mechanism of PAO/PVA for U(VI) adsorption was further studied by Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) measurements. It was found that the N/O donor atoms derived from amidoxime were the main binding sites for U(VI). This work may provide motivation for the rational design and construction of efficient PAO-based composites for uranium adsorption.
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高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2023
·Vol. 333
·期 1
·71-84
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IF 1.6
Du Zhiyuan,Ni Yuran,Peng Hao,Tang Mei,Li Yuanli,Lv Lina,Li Xiaoyu,Chi Fangting
Novel chitosan crosslinked amidoxime polyacrylonitrile aerogel was synthesized and used for adsorption of uranium from seawater. The effects of initial uranium concentration, contact time, and pH value on uranium adsorption were investigated. The simulated uranium solution adsorption experiment shows that under the condition of an initial uranium concentration of 100 mg/L, the maximum adsorption capacity of CTS-g-PAO is 203.4 mg/g. The adsorption process can be well-fitted by Freundlich and Pseudo-second order models. In addition, CTS-g-PAO aerogel has good antibacterial activity against marine bacteria, with the antibacterial activity reaching 94.8%. The results demonstrated that CTS-g-PAO aerogel was an effective adsorbent for extracting uranium from seawater.
研究领域:
环境科学
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材料科学
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Jianfeng Cheng,Ju Wang,Qiao Jiang,Jingli Xie,Shengfei Cao,Qi Zhang,Runqiu Gu
During the long-term deep geological disposal of high-level radioactive waste , buffer materials, such as bentonite , in the waste repositories are irradiated with gamma (γ) rays, affecting their structural stability. Furthermore, bentonite colloids are formed owing to the erosion of bentonite particles by groundwater. However, the effects of prolonged irradiation on the stability of bentonite colloids and their interaction with radionuclides , which can affect the migration of the radionuclides , are yet to be elucidated. Herein, we investigated the stability of colloid prepared from irradiated bentonite with varying doses of γ rays and conducted static adsorption batch experiments to examine their U(VI) adsorption behavior. The results showed that the stability of bentonite colloids was affected by their concentration, storage time, pH, and temperature. An investigation into their polymerization kinetics revealed that the critical coagulation concentration of bentonite colloids decreased with increasing irradiation dose, indicating that the colloids formed from unirradiated bentonite were stable. Furthermore, the U(VI) adsorption capacity of bentonite colloids decreased with increasing irradiation dose. This study provides new insights into the formation and stability of colloids of buffer materials after their irradiation and is expected to contribute significantly to the study of the migration behavior of nuclides by colloidal carriers.
研究领域:
环境科学
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放射化学
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DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Yifeng Zhang,Shuo Zhang,Haorong Sun,Zhe Wang,Feixue Gao,Jiawei Zhang,Zezheng Liu,Ming Fang,Xiaoli Tan,Xiangke Wang
Photocatalytic U(VI) extraction is considered as the most promising way to solve the current shortage of uranium resources and radioactive contamination. In this work, O-doped hexagonal-cubic CdS phase heterojunction was constructed by a simple thermal treatment and was successfully used for the photoextraction of U(VI) from water bodies. The samples with different heat treatment temperatures have different phase ratios and oxygen doping amounts. The experimental results show that the CdS heat treated at 350 °C (CdS-350) has the best photocatalytic activity, which can extract 80% of uranium within 120 min (m/v CdS-350 = 0.4 mg/g, C U(VI) = 50 ppm). More interestingly, a systematic mechanistic investigation shows that the extraction process is divided into two steps: i.e., photoelectrons and • O 2 − reducing U(VI) to U(IV) first, followed by photoholes and • OH oxidizing U(IV) to insoluble U(VI) (UO 2 (OH) 2 ). The second step of oxidation allows CdS-350 to avoid photocorrosion, resulting in an excellent recycling performance of only 8% decrease in performance after four cycles.
研究领域:
环境科学
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材料科学
·
化学
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高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2020
·Vol. 324
·期 2
·813-822
·
IF 1.137
Liu Peng,Yu Qiang,Xue Yun,Chen Jiaqi,Ma Fuqiu
We present a simple strategy for preparing amidoxime modified activated carbon. The composition and morphology of the materials have been confirmed via powder XRD, BET, TGA, SEM and FT-IR studies. Batch adsorption experiment were exploited to explore adsorption performance of U(VI) by amidoxime-based activated carbon. The adsorption capacity of activated carbon was significantly improved after the modification by amidoxime, the amidoxime-based activated carbon was a possible adsorbent for adsorbing U(VI). This study reveals that with a facile synthesis and low-cost, amidoxime-based activated carbon 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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DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2019
·
IF 5.714
Jie Ding,Zijun Yan,Lanqi Feng,Fuwan Zhai,Xiao Chen,Yuwei Xu,Siqun Tang,Chao Huang,Laicai Li,Ning Pan,Yi He,Yongdong Jin,Chuanqin Xia
There is a need to develop highly efficient materials for capturing uranium from nuclear wastewater. Here, 5-methylbenzotriazole modified graphene oxide (MBTA-GO) was used to adsorb U(VI) from aqueous solution. By the trials of different conditions, we found that the removal of U(VI) from acidic solution was strongly dependent on pH but independent of ionic strength. The U(VI) adsorption was perfectly conformed to the pseudo-second-order kinetics and the adsorption isotherms were simulated by the Langmuir model well. A high removal capacity ( q max = 264 mg/g) for U(VI) at pH 3.5 was obtained. XPS, EXAFS analyses and DFT calculations revealed that the mechanism of uranium capture was ascribed to (i) the surface complexation by benzotriazole and carboxyl groups (providing lone pair electrons) on MBTA-GO and (ii) enhanced synergistic coordination ability of delocalized π-bond of triazole group toward U due to the transfer of electrons from graphene sheet to benzotriazole. DFT calculations further demonstrated that benzotriazole displayed stronger binding with U(VI) compared to carboxyl group due to higher binding energy of [Side/Surface-U-MBTA-GO] (79.745, 54.986 kcal/mol) than [MBTA-GO–COOH–U] (27.131 kcal/mol). This work will provide valuable insight into designing novel nitrogen-containing adsorbents for practical application in 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
PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2018
·Vol. 5
·期 10
·2399-2407
·
IF 5.106
Hongwei Pang,Shuyi Huang,Yihan Wu,Dongxu Yang,Xiangxue Wang,Shujun Yu,Zhongshan Chen,Ahmed Alsaedi,Tasawar Hayat,Xiangke Wang
The toxicity and radioactivity of uranium [235,238U(VI)] has resulted in serious environmental issues in recent years. Polyethyleneimine-decorated waste fly ash (FA@PEI) from thermal power plants has been fabricated via a novel and cost-efficient method and applied to the U(VI) elimination from aqueous solutions by batch experiments. The U(VI) removal was found to be dramatically influenced by pH whilst being ionic strength-independent, which indicated that the interaction was primarily controlled by inner-sphere surface complexation. Kinetic studies showed that the FA@PEI had an ultrafast removal rate (1.5 h to achieve adsorption equilibration) for U(VI) and a pseudo-second-order model fitted the adsorption process. The maximum removal capacity of U(VI) by FA@PEI was 70.3 mg g−1 at 298 K and pH 5.0. Based on the thermodynamics data (ΔH° > 0, ΔS° > 0 and ΔG° < 0), the U(VI) removal process is typically spontaneous and endothermic. According to the XPS analysis, the enhanced U(VI) adsorption was mainly attributed to the abundant metal–oxide bonds and amine groups (–NH2, –NH–). Furthermore, the FA@PEI material also demonstrated an outstanding regeneration ability. This paper highlights FA@PEI as an environmentally-friendly and economical alternative for U(VI) elimination from waste water.
研究领域:
环境科学
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2023
·Vol. 332
·期 1
·173-183
·
IF 1.6
Zhang Nan,Li Jinfeng,Tian Bo,Zhang Jianwei,Li Tuo,Li Zhigang,Wang Yi,Liu Zhixin,Zhao Hongtao,Ma Fuqiu
A novel phosphorylated cellulose carbamate (PCC- x ) by introducing urea into the functionalized reaction is demonstrated. The effects of urea content on the structures and U(VI) adsorption properties of PCC- x are investigated. The results indicate that urea provides new amino sites along cellulose chains and plays a decisive role in the phosphorylation modification of cellulose carbamate. When the content of urea is optimized, the sample possesses the maximum degree of phosphorylation, resulting in the excellent U(VI) adsorption properties, including high adsorption capacity (1006.9 mg·g −1 at pH = 5 and T = 298 K), fast adsorption dynamics, good adsorption selectivity and reusability. Graphical abstract Phosphorylated cellulose carbamate for highly effective capture of U(VI)
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
Desalination and Water Treatment
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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
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核化学
·
水处理技术
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Xin Zhong,Zhehong Ji
Benzothiazole/benzothiazole-based COFs exhibited pronounced stability and π-π conjugation. • The “dual-lock” structure of Tp-BTZ exhibited the π-electron delocalization effect. • The photoreduction rate of Tp-BTZ was 5.47 and 1.88 times that of Tb-DBD and Tp-DBD. • Photogenerated e - , •O 2 – , H 2 O 2 were the principal active species in U(VI) reduction. The intrinsic characteristics of covalent organic frameworks (COFs) have drawn considerable attention for uranium recovery applications. Herein, we constructed three robust and highly π-π conjugated COFs (Tb-DBD, Tp-DBD, Tp-BTZ) for photocatalytic U(VI) reduction. Where π-electron delocalization featured the extension of π-electron clouds within organic molecules, the incorporation of highly planar-conjugated benzoxazole and benzothiazole monomers into the backbone structure enabled efficient π-π stacking interactions, thereby introducing expanded π-electron clouds, facilitating charge transport and optimizing the photochemical performance of COFs. Research findings indicated that Tp-BTZ possessed an intramolecular ‘dual-locked’ structure, achieving ‘heteroatom locking’ via its benzothiazole ring and ‘hydrogen-bond locking’ through its β-ketoenamine bond, endowing it with abundant adsorption sites and in-plane π-electron delocalization effects. Specifically, the addition of 5 mg Tp-BTZ at pH 6.0 during the photocatalytic reaction for 210 min yielded the removal efficiency of U(VI) at 91.85%, and the reaction rate of 0.662 h −1 as fitted by pseudo-first-order kinetics, representing 5.47 and 1.88 times that of Tb-DBD and Tp-DBD respectively. Furthermore, compared to Tb-DBD and Tp-DBD, Tp-BTZ exhibited more pronounced O 2 activation properties, demonstrating highly efficient photocatalytic H 2 O 2 production and facilitating the deposition of U(VI) in the form of (UO 2 )O 2 ·2H 2 O onto the catalyst surface. Download: Download high-res image (194KB) Download: Download full-size image
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Xu Zhang,Dongxiang Zhang,Dagang Li,Shusen Chen,Fengqi Zhang,Zilei Zhang,Haocun Tan,Le Yang,Jinzheng Hou,Runchao Tan,Jinying Li,Xiyan Xu
Carboxymethylcellulose-based zwitterionic cryogels (AO-PAM/CMC) with a supermacroporous pore structure were prepared through cryo-polymerization and post-modification strategies. The hydrogel exhibited a supermacroporous structure, excellent hydrophilicity, superior mechanical properties, and resistance to biological contamination. Through a comprehensive investigation of the U(VI) adsorption process, it was observed that the AO-PAM/CMC hydrogel was predominantly characterized by chemisorption, wherein uranyl ions were adsorbed on the surface in the form of a monolayer. Under the conditions of 45 °C and pH = 5.0, the hydrogel demonstrated remarkable adsorption performance, with the maximum adsorption capacity reaching 1223.6 mg∙g −1 , showcasing a high degree of selectivity for U(VI). In real seawater, the hydrogel's adsorption capacity for uranium reached 12.95 mg∙g −1 after 25 days of exposure, with the adsorption equilibrium being essentially reached in about 10 days. The adsorption mechanism of U(VI) by the hydrogel was confirmed through XPS spectroscopy and DFT calculations. The synergistic interplay between guanidino and zwitterionic moieties within the AO-PAM/CMC hydrogel enhanced U(VI) adsorption capacity and facilitated rapid uranium extraction from seawater. (UES). Therefore, the AO-PAM/CMC hydrogel presents a novel solution to address the inefficiencies of existing technologies for uranium extraction from seawater, contributing an innovative approach to the sustain-able development of nuclear energy.
研究领域:
环境科学
·
材料科学
·
核工程
·
化学工程
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DOI
高影响因子
危险品化学品经营许可证（带存储）