SCIENCE OF THE TOTAL ENVIRONMENT
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2019
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IF 5.589
Xin Wang,Jinghua Feng,Yawen Cai,Ming Fang,Mingguang Kong,Ahmed Alsaedi,Tasawar Hayat,Xiaoli Tan
This study investigated the modification of moso bamboo biochar with polyethyleneimine (PEI) for the efficient enrichment of U(VI) in aqueous solution. The alkali/acid treated biochars with amine groups (PEI-alkali-biochar or PEI-acid-biochar) were characterized by SEM , BET, TGA , FTIR and XPS. The effects of contact time, U(VI) concentration, pH and ionic strength on U(VI) adsorption by PEI-alkali/acid-biochar were studied. U(VI) adsorption process on PEI-alkali/acid-biochar obeys pseudo-second-order model. Intraparticle diffusion model was used to investigate the controlled factors of the adsorption process. The fitting of Langmuir model gives the maximum adsorption capacities of 212.7 mg/g for PEI-alkali-biochar and 185.6 mg/g for PEI-acid-biochar, which are almost 9–10 times higher than that of pristine biochar (20.1 mg/g). The thermodynamic parameters illustrate that U(VI) adsorption on PEI-alkali/acid-biochar is an exothermic and spontaneous process. The FTIR and XPS analyses imply that U(VI) adsorption by PEI-alkali/acid-biochar is mainly controlled by complexation between U(VI) and amine groups. PEI-alkali/acid-biochar could be considered as a low-cost and outstanding material for U(VI) removal from radionuclide wastewater in practical application.
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CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Shuyi Huang,Shibo Jiang,Hongwei Pang,Tao Wen,Abdullah M. Asiri,Khalid A. Alamry,Ahmed Alsaedi,Xiangke Wang,Suhua Wang
Magnetic nanomaterials are promising adsorbents for their superior performance in the elimination of radioactive ions from aqueous solution. In this study, a new kind of fluorescent carbon dots were successfully introduced into MnFe 2 O 4 to fabricate magnetic polyethyleneimine-functionalized carbon quantum dots/MnFe 2 O 4 (PECQDs/MnFe 2 O 4 ) nanocomposites by a simple hydrothermal method, which combined the fluorescent characteristic of CQDs, adsorption capacity of polyethyleneimine and magnetic separation property of MnFe 2 O 4 . Detailed characterization certified the formation of nanohybrid composites and its integrating advantages of fluorescence property and magnetism separation, which demonstrated its potential in immobilizing U(VI) and monitoring the adsorption process simultaneously in wastewater. The obtained PECQDs/MnFe 2 O 4 was applied to remove U(VI) from aqueous solution and showed superior construction stability and adsorption capacity of 194 mg/g. Moreover, the kinetic and thermodynamic results suggested that the immobilization of U(VI) was an endothermic and spontaneous multilayer adsorption dominated process. In the end, the cation exchange and interaction between uranyl ions and abundant functional groups (i.e., NH 2 , OH and COOH) on PECQDs/MnFe 2 O 4 were revealed to be responsible for the enhanced adsorption of U(VI), which was realized by forming outer-sphere surface complexes in the removal process. This study proposed an ultrafast-kinetics and high-efficiency adsorbent for U(VI) sequestration, which has a great application potential due to its outstanding recycling performance.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2014
·Vol. 300
·期 3
·1235-1244
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IF 1.415
Yu Xiao-Feng,Liu Yun-Hai,Zhou Zhi-Wei,Xiong Guo-Xuan,Cao Xiao-Hong,Li Min,Zhang Zhi-Bin
The phosphorylated hydrothermal carbon spheres (HCS-PO 4 ) were developed by functionalizing hydrothermal carbon spheres (HCS) with o -phosphoethanolamine, and the structure and textural property were characterized by SEM and FT-IR. The parameters that affect the uranium(VI) sorption, such as solution pH, initial U(VI) concentration, contact time, and temperature, had been investigated. The HCS-PO 4 showed the highest uranium sorption capacity at initial pH 6.0 and contact time of 120 min. The adsorption kinetics was better described by the pseudo-second-order model, and the adsorption process could be well defined by the Langmuir isotherm and the maximum monolayer adsorption capacity increased from 80.00 to 434.78 mg/g after phosphorylation. The thermodynamic parameters, ∆ G° (298 K), ∆ H ° and ∆ S °, demonstrated shown that the sorption process of U(VI) onto HCS-PO 4 was feasible, spontaneous and endothermic in nature. The spent HCS-PO 4 could be effectively regenerated by 0.1 mol/L EDTA solution for the removal and recovery of U(VI) and reused for ten cycles at least. Selective adsorption studies showed that the HCS-PO 4 could selectively remove U(VI), and the selectivity coefficients of HCS in the presence of co-existing ions, Mg(II), Na(I), Zn(II), Mn(II),Co(II), Ni(II), Sr(II), Cs(I) and Hg(II) improved after functionalization.
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APPLIED SURFACE SCIENCE
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2017
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IF 3.387
Wenting Li,Qi Liu,Jingyuan Liu,Hongsen Zhang,Rumin Li,Zhanshuang Li,Xiaoyan Jing,Jun Wang
Polyacrylonitrile fibers (PANF) covalently modified with lysine (PAN-Lys) was facilely synthesized and carefully characterized. The critical factors affecting U(VI) adsorption from aqueous solution were exploited, such as initial pH, contact time, concentration and temperature. The adsorption process is strongly dependent on solution pH. With excellent adsorption capacity and high affinity toward U(VI), the process for U(VI) is extremely rapid and the equilibrium can be reached within 20 min. The thermodynamics and kinetics were strictly evaluated. In addition, the hypothetical adsorption mechanisms were proposed. Moreover, the adsorption behavior at low concentrations (3–30 μg L −1 ) in simulated seawater was also investigated. Therefore, PAN-Lys can be potentially utilized for the efficient removal of U(VI) from seawater.
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WATER RESEARCH
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2025
·
IF 12.4
Lan Lei,Rui Zhang,Rui-Xiang Bi,Zhi-Hai Peng,Xin Liu,Tie-Ying Shi,Li Zhang,Ru-Ping Liang,Jian-Ding Qiu
Efficient uranium capture from rare earth tailings wastewater holds great importance for human health and sustainable development. Herein, we present a simple and eco-friendly approach to form a single network hydrogel through electrostatic interaction between chitosan and sodium alginate. Subsequently, calcium phytate is introduced as a natural crosslinking agent to generate a secondary cross-linked network, leading to a composite hydrogel (CS-SA/PCa) with a doubly enhanced network structure for efficient adsorption of uranium from wastewater. The established multistage porous structure enables the rapid diffusion of uranyl ions, and the abundant phosphate groups serving as adsorption sites can offer high affinity for U(VI). Most importantly, CS-SA/PCa is formed through physical cross-linking of sustainable biopolymers, avoiding the use of toxic chemical agents. In addition, CS-SA/PCa exhibited significantly better mechanical properties than those of single-network physical hydrogels crosslinked by electrostatic interactions, which overcame the weak mechanical properties of physical hydrogels. It provides a new method for the manufacture of environmentally friendly, low-cost and robust physical hydrogels based on natural polymers.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Shuang Liu,Nan Zhao,Liyuan Zheng,Richard I. Foster,Wonseok Yang,Zhe Wang,Yuexiang Lu
Photocatalysis has been regarded as one of the effective methods of removing U(VI) from radioactive wastewater in recent years, due to the benefits of being environmentally friendly and efficient. In this work, a Pt cluster modified carbon nitride photocatalyst (Pt-CN) was synthesized in zinc chloride molten salt. The photocatalysts were characterized by XRD, IR, XPS, UV–vis, PL and EIS. The result demonstrated that the doping of Pt makes Pt-CN show higher electronic conductivity and better charge separation and migration, leading to an enhanced photocatalytic activity and faster kinetics compared with bulk graphitic carbon nitride (g-C 3 N 4 ). Moreover, for uranium contained solution photocatalytic treatment, Pt-CN reached 94.6 % removal efficiency after 300 min of illumination with Xe light, and the kinetics improved by a factor of three compared to that of g-C 3 N 4 . Furthermore, the good reusability and photostability of the Pt-CN was confirmed as the removal efficiency remained at 83.7 % even after being recycled and reused five times. The photocatalytic reaction product was characterized as (UO 2 )O 2 ·2 H 2 O, and the mechanism was deduced as uranium species reacting with H 2 O 2 generated by light illumination in an open system. This molten salt one-step synthesis and Pt doping method and the performance of U(VI) extraction in air showed a promising potential for the application of Pt-CN for U(VI) extraction and removal from water.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Jinfeng Li,Tuo Li,Qianwen Wang,Bo Tian,Zhigang Li,Jianwei Zhang,Wenze Li,Wa Gao,Nan Zhang,Haifeng Gu,Hongtao Zhao
The development of high-efficiency adsorption materials for efficient removal of U(VI) from nuclear wastewater has become a concern of environmental protection. LDHs, as adsorbent materials, lack functional groups, resulting in low adsorption performance. Herein, a novel and excellent radiation stable HPO 4 2− -intercalated NiFe-LDH material (NiFe-LDH-P(x)) is synthesized by in-situ co-precipitation method. The effect of HPO 4 2− content on the U(VI) performance of NiFe-LDH-P(x) is studied in detail. The results reveal that intercalation of HPO 4 2− increases the interlayer spacing and specific surface area of NiFe-LDH, as well as the active sites between the interlayers. Therefore, NiFe-LDH-P(x) with moderate HPO 4 2− content (10 %) can reach highest U(VI) adsorption capacity (350.88 mg·g −1 ). FTIR, SEM and XPS analyses educe that the efficient adsorption of uranium on NiFe-LDH-P(10 %) is mainly attributed to complexation, electrostatic attraction and ion exchange. In summary, NiFe-LDH-P(10 %) has great potential in removing uranium from wastewater, which provides a new idea for the synthesis of efficient adsorbents.
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Journal of Environmental Sciences
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2018
·
IF 3.12
Qingyuan Hu,Yuling Zhu,Baowei Hu,Songhua Lu,Guodong Sheng
The magnetic iron oxide (Fe 3 O 4 ) nanoparticles stabilized on the biochar were synthesized by fast pyrolysis of Fe(II)-loaded hydrophyte biomass under N 2 conditions. The batch experiments showed that magnetic biochar presented a large removal capacity (54.35 mg/g) at pH 3.0 and 293 K. The reductive co-precipitation of U(VI) to U(IV) by magnetic biochar was demonstrated according to X-ray diffraction, X-ray photoelectron spectroscopy and X-ray absorption near edge structure analysis. According to extended X-ray absorption fine structure analysis, the occurrence of U-Fe and U-U shells indicated that high effective removal of uranium was primarily inner-sphere coordination and then reductive co-precipitation at low pH. These observations provided the further understanding of uranium removal by magnetic materials in environmental remediation.
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Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Shuai Zhou,Yanxing Xie,Feiyu Zhu,Yuanyuan Gao,Yingjiu Liu,Zhenping Tang,Yi Duan
Graphene oxide (GO) and its composites are promising candidates for the adsorption of U(VI) in water. Whereas the high hydrophobicity and dispersibility of GO makes it hard to separate from aqueous solutions, and thus greatly restricts its practical application. To address this defect, a novel composite [i.e., poly(amidoxime)/GO/chitosan (PAO/GO/CS)] was prepared. Characterization including Fourier transform infrared spectroscopy , X-ray diffraction, and X-ray photoelectron spectroscopy confirmed that cross-linking reaction between GO and CS may consume oxygen-contained groups of GO. The resulting deficit in U(VI) adsorption may be compensated by the amidoxime grafted onto the surface of GO/CS. Langmuir model showed that the maximum adsorption capacity of U(VI) by PAO/GO/CS was up to 701.5, 821.7, and 1220.0 mg/g, respectively, under 293, 303, and 313 K at pH 6.0. U(VI) is spontaneously and mainly chemically adsorbed onto the oxygen-containing groups (i.e., hydroxyl and amidoxime) in PAO/GO/CS based on characterization and density functional theory (DFT). DFT analysis indicated that the optimized adsorption energy of most stable configuration of the uranyl-PAO/GO/CS is −309.99 kcal/mol. PAO/GO/CS can achieve selective adsorption for U(VI) against common coexisting ions and superior separation from water. These findings demonstrate the feasibility of PAO/GO/CS composite used for the remediation of uranium-containing wastewater.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Yanbing Sun,Nan Yuan,Yulin Ge,Tianzhen Ye,Zhen Yang,Liping Zou,Wei Ma,Liang Lu
Using a low-cost, pollution-free and efficient adsorbents to adsorb uranium in radioactive wastewater is of great significance to protect the environment. In this study, bamboo powder-derived biomass charcoal (BDC) was first composited with MoS 2 , and then the composites were surface-modified with phytic acid to obtain BDC/MoS 2 -PO 4 . The microstructure of the adsorbents was analyzed by various characterization techniques. The adsorption kinetics results showed that the U(VI) adsorption by BDC/MoS 2 -PO 4 was more in line with the pseudo-second-order kinetic model, suggesting that the process is mainly chemical adsorption. The adsorption isotherm model confirmed that the U(VI) adsorption by BDC/MoS 2 -PO 4 conformed to the Langmuir isotherm model, which was mainly surface monolayer adsorption with a maximum adsorption capacity of 161.29 mg/g. Furthermore, the adsorption performance of the adsorbent for U(VI) was significantly enhanced after H 2 plasma treatment (204.08 mg/g), indicating that the increase in sulfur vacancies favors the U(VI) adsorption. The EPR, XPS and FT-IR results suggested that the interaction mechanism could be explained in that the S vacancies, S, C-O and P-O of the BDC/MoS 2 -PO 4 were bonded to [O = U = O] 2+ in the solution. This study provides a theoretical and experimental basis for the design and synthesis of biochar-based materials, and also provides a reference for radioactive wastewater treatment.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2026
·
IF 5.9
Xinyu Zhao,Zhenzhong Liu,Chunguang Li,Zhongran Dai
Optimized SRB-ethanol synergy removes 91.8% U(VI) and 86.3% sulfate. • Sequential mineralization ensures long-term U stability via reduction and encapsulation. • SRB dominance and sulfur respiration upregulation drive alkalinity, low Eh, and multi-metal co-precipitation. • δ 34 S used as a potential tracer for evaluating the restoration of underground mining environments. The efficacy of sulfate-reducing bacteria (SRB) in remediating uranium-contaminated groundwater hinges on the coupling mechanism between sulfate reduction and U(VI) immobilization, which remains poorly understood. Herein, we confirmed that under optimal conditions (pH 6.0, 0.4% ethanol, 10% inoculation rate), the combined treatment of an acid-tolerant sulfate-reducing bacterial consortium (previously isolated from the uranium mining area and laboratory-enriched) with ethanol achieved 91.8% removal of dissolved U and 86.3% reduction of sulfate, along with significant co-precipitation of dissolved Fe and Al. Mineralogical characterization reveals a sequentially linked mineralization network of UO 2 , FeS, CaCO 3 , and Al(OH) 3 , sustained by the SRB-mediated alkaline effect and the continuous decline in redox potential (Eh). High-throughput sequencing revealed enrichment of taxa affiliated with known sulfate-reducing lineages and upregulation of sulfur metabolism pathways, suggesting enhanced sulfate-reducing potential within the microbial community. Notably, sulfur isotope analysis (δ 34 S) revealed distinctly different apparent fractionation factors (ε) between low and high sulfate removal conditions (ε ≈ 2.15‰ vs. 0.22‰). This contrast tentatively suggests a potential shift in the rate-limiting step of sulfate reduction, although further time-series isotope measurements are required to rigorously validate this hypothesis. This work demonstrates the feasibility of SRB-enhanced remediation for uranium-contaminated groundwater and establishes δ 34 S as a potential geochemical tracer for assessing the effectiveness and long-term stability of remediation measures in underground mining environments. Download: Download high-res image (187KB) Download: Download full-size image
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ENVIRONMENTAL RESEARCH
·
2026
·
IF 8.2
Wei Peng,Xiancai He,Jiangang Li,Xianlin Chen,Zhongsheng Chen,Guolin Huang
With the extensive deployment of nuclear energy, uranium contamination—particularly in the hexavalent form U(VI)—has become an escalating threat to aquatic systems. Photocatalytic reduction has emerged as a green and sustainable strategy for environmental remediation. However, achieving high photocatalytic efficiency and effective solar energy utilization remains a significant challenge. In this study, a series of BaTiO 3 /g-C 3 N 4 (BTO/CN) type-II heterojunction photocatalysts were synthesized through a simple hydrothermal method with rational band alignment. The effect of different BTO/CN ratios on U(VI) removal efficiency was evaluated. Among the tested compositions, BaTiO 3 /g-C 3 N 4 -4 exhibited the highest photocatalytic performance, achieving a U(VI) removal efficiency of 96.2% within 20 min of visible light irradiation—significantly outperforming both individual components and other composite ratios. The optimized heterojunction effectively modulated the electronic band structure, facilitating the rapid separation of photogenerated electron-hole (e − -h + ) pairs. Furthermore, the synergistic effect between the heterojunction interface and the intrinsic ferroelectric properties of BaTiO 3 significantly suppressed charge carrier recombination and extended the visible-light absorption range. This, in turn, substantially enhanced the overall photocatalytic efficiency of the system. The rational design of BaTiO 3 /g-C 3 N 4 heterojunctions offers a promising strategy and a robust experimental basis for the development of high-efficiency photocatalysts of uranium remediation.
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