Journal of Environmental Chemical Engineering
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2026
·Vol. 14
·期 5
·124442
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IF 7.5
Huan Lu,Jinghao Huang,Jianhong Ma,Dexin Ding,Liangbing Sheng,Yang Ding,Hui Zhang,Feng Li,Yongdong Wang
Regenerable cathodes that integrate efficient charge transfer with abundant binding sites are essential for electrochemical U(VI) capture in hybrid capacitive deionization (HCDI) systems. Herein, Ti 3 C 2 T x MXene (MXene), a two-dimensional transition metal carbide, a high-entropy Prussian blue analogue (HEPBA), and their composite, MXene-HEPBA, were evaluated as cathode materials for electro-assisted U(VI) removal. MXene mainly exhibited electric double-layer capacitive behavior, whereas HEPBA and MXene-HEPBA showed pronounced Faradaic redox characteristics. By coupling the conductive MXene scaffold with the multimetal coordination-active HEPBA framework, MXene-HEPBA delivered specific capacitances of 87 F/g at 1.25 A/g and 67 F/g at 6.25 A/g. In synthetic U(VI)-containing solutions, MXene-HEPBA achieved a U(VI) uptake capacity of 56 mg/g under optimized HCDI conditions and exhibited efficient regeneration, with a desorption efficiency of 92% using 0.5 mol/L HNO 3 under a reverse voltage of 0.8 V. In actual uranium-bearing groundwater, MXene-HEPBA achieved approximately 59% U(VI) removal, corresponding to an uptake capacity of 47.612 mg/g after pH and flow-rate optimization. Mechanistic analyses revealed that U(VI) was mainly immobilized as coordinated uranyl-like species through coupled electrosorption, surface complexation, and multisite coordination involving MXene surface terminations and HEPBA coordination sites. These results demonstrate its potential as a regenerable HCDI cathode for electrochemical purification of uranium-contaminated groundwater.
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CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Yanbing Sun,Jianfa Chen,Yixiao Kang,Haoyan Zhang,Yulin Ge,Nan Yuan,Yubo Xing,Wei Ma,Zhen Yang,Liping Zou,Liang Lu
An environmentally friendly and cost-effective adsorbent for removing U(VI) from radioactive wastewater is of significant importance for protecting the environment. In this work, we successfully prepared an ultralight carbon aerogel material (CUCA/MPCs) derived from chitosan and MOFs, and synthesized an adsorbent (CUCA/MPCs-PO 4 ) with a high chelation ability to U(VI) through phosphorylation modification. Various characterization techniques were used to characterize the microscopic morphology and crystallographic structure of the adsorbents. During the batch experiments, it was determined that the optimum pH for the adsorbents for U(VI) was 6.5. According to the linear Langmuir isotherm model and pseudo-second-order kinetic model, U(VI) adsorption on the adsorbent is a monolayer chemisorption reaction. The fitted maximum adsorption capacities of CUCA-PO 4 , CUCA/1MPCs-PO 4 , and CUCA/2MPCs-PO 4 for U(VI) were 357.1 mg/g, 526.3 mg/g, and 592.0 mg/g, respectively. Furthermore, the three adsorbents showed good recyclability, maintaining 79.0 %, 77.4 %, and 82.2 % of the initial adsorption capacity after eight cycles, respectively. The results of actual U(VI) waste adsorption experiments showed that CUCA/2MPCs-PO 4 achieved 92.2 % removal of U(VI), showing good potential for practical applications. Finally, the possible adsorption mechanism between U(VI) and adsorbent was discussed in the context of experimental and characterization results. Overall, this study provides a valuable research idea for the treatment of radioactive wastewater containing U(VI).
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Journal of Environmental Sciences
·
2022
·
IF 6.796
Zhongshan Chen,Xuan He,Qian Li,Hui Yang,Yang Liu,Lining Wu,Zhixin Liu,Baowei Hu,Xiangke Wang
For the continuous utilization of nuclear energy and efficient control of radioactive pollution, low-cost materials with high efficient U(VI) removal are of great importance. In this study, low temperature plasma method was applied for the successful modification of O-phosphorylethanolamine (O-PEA) on the porous carbon materials. The produced materials (Cafe/O-PEA) could adsorb U(VI) efficiently with the maximum sorption capacity of 648.54 mg/g at 1 hr, T=298 K, and pH=6.0, much higher than those of most carbon-based composites. U(VI) sorption was mainly controlled by strong surface complexation. From FTIR, SEM-EDS and XPS analyses, the sorption of U(VI) was related to the complexation with -NH 2 , phosphate and -OH groups on Cafe/O-PEA. The low temperature plasma method was an efficient, environmentally friendly and low-cost method for surface modification of materials for the effective enrichment of U(VI) from aqueous solutions.
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PubMed
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JOURNAL OF SOLID STATE CHEMISTRY
·
2020
·
IF 2.726
Yanbing Sun,Yixiao Kang,Weihong Zhong,Yuhui Liu,Ying Dai
In this paper, novel phosphorylated hydrothermally cross-linked chitosan (HCC-PO 4 ) was prepared by simple hydrothermal cross-linking technology. The prepared adsorbents were characterized by SEM, XRD , and FT-IR, etc., which proved that -PO 4 was successfully introduced into the hydrothermally cross-linked chitosan (HCC). Batch experiments were carried out to investigate the adsorption process of U(VI) on the adsorbent. It was found that the theoretical maximum U(VI)-adsorption capacity of HCC-PO 4 was 384.6 mg·g −1 at 298.15 K and pH 5.5. HCC-PO 4 still had adsorption selectivity as high as 71.5% in a competitive ion system. In addition, HCC-PO 4 maintained 85.4% of its original adsorption capacity after 5 adsorption-desorption cycles. On account of the high selectivity and high U(VI)-adsorption capacity, HCC-PO 4 showed promise in removing U(VI) in wastewater in actual production.
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JOURNAL OF HAZARDOUS MATERIALS
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2020
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IF 9.038
Xin Wang,Yawen Cai,Tianhao Han,Ming Fang,Kechang Chen,Xiaoli Tan
Elimination of U(VI) from polluted solutions is important for human health and environmental safety. In this work, a relatively low-cost 3D flower-like phosphate-functionalized layered double hydroxides (phos-LDH) was fabricated by a one-pot hydrothermal method. The prepared phos-LDH inherited the structure of 3D flower-like layered double hydroxides (LDH), and had a higher specific surface area (∼203.4 m 2 ⋅g −1 ) than that of LDH. The kinetic process indicated that U(VI) adsorption onto phos-LDH achieved equilibrium within 15 min and obeyed general order model. The adsorption isotherms of phos-LDH illustrated that the U(VI) adsorption obeyed Langmuir model, the adsorption capability of phos-LDH can reach 923.1 mg⋅g −1 at 298 K. The U(VI) adsorption was a spontaneous and endothermic process according to the thermodynamic data. There was the electrostatic attraction between U(VI) and phos-LDH at pH = 5.0. FTIR and XPS analyses educed that the hydroxyl and phosphate groups played a very useful role for the complexation between U(VI) and phos-LDH. In addition, the excellent selective adsorption capability for U(VI) in competitive cation and anion solutions further confirmed the practical application of phos-LDH in real wastewater treatment.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Linzhe Xu,Yingbo Chen,Wenxuan Su,Junbo Cui,Siyu Wei
Two-dimensional metal carbides (MXene) and amidoxime-based materials have attracted more and more attention in heavy metal adsorption. Herein, we prepared a mixed matrix membrane of amidoximized polyacrylonitrile with MXene particles by a simple phase separation method (M/PAO mixed matrix membrane). The M/PAO mixed matrix membrane had excellent U(VI) ion selectivity compared to vanadium. Under the synergistic adsorption of the two functional adsorption units, the maximum adsorption capacity can reach 10.31 g/m 2 (364.46 mg/g) at pH = 6, while the adsorption capacity of U(VI) can reach 37.49 mg/m 2 (1.3225 mg/g) in a seven-day natural seawater experiment, which was far more than that of single amidoxime-based adsorbent. Pseudo-second-order kinetics and Langmuir adsorption model were used to study the adsorption behavior. The results of various characterization methods showed the complexation mechanism between the M/PAO mixed matrix membrane and U(VI) ions. Considering its excellent adsorption capacity and facile preparation process, we believe that the M/PAO mixed matrix membrane is one of the most promising candidates for large-scale U(VI) extraction from seawater.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2026
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IF 5.4
Boqing Li,Yanli Yang,Tao Song,Wei Ge,Senda Su,Yaping Zhang,Xiaoting Zhang,Xiaoli Zhao,Keke Guo,Pengfei Song
Metal halide perovskites (MHPs) have emerged as highly promising materials in the field of photocatalysis due to their unique and advantageous physicochemical properties. However, their limited water stability remains a primary bottleneck hindering further practical applications. Here, we synthesized a series of novel organic–metal hybrid interlayer (OMI) phase-bridged perovskite-like photocatalysts ([Pb 2 Br x I 3-x ] + [Pb 2+ (imdc 3− )] (x = 0,1,2, corresponding to compounds 1–3)) based on 4,5-imidazoledicarboxylic acid for photocatalytic removal of U(VI). The direct coordination assembly between the OMI and inorganic layers endows these materials with exceptional intrinsic stability in water. Notably, compounds 1–3 can maintain excellent stability for up to one month in aqueous solutions; and compound 2 keeps structural stability across different pH solutions. By tuning the halogen composition, compound 2 achieves markedly improved photogenerated carrier separation and charge transfer, as verified by steady-state and time-resolved photoluminescence spectroscopy, transient photocurrent responses, and density functional theory (DFT) calculations. DFT further reveals suitable U(VI) adsorption sites and excellent charge-transfer capability. As a result, compound 2 delivers a U(VI) removal rate of 99.3% from a 20 ppm solution under simulated sunlight irradiation within 180 min, along with outstanding selectivity, stability, and recyclability. This work provides a promising strategy for designing efficient and stable perovskite-like photocatalysts for the photoreduction of U(VI). Download: Download high-res image (119KB) Download: Download full-size image The direct coordination assembly between the OMI and inorganic layers ([Pb 2 BrI 2 ] + ) endows perovskite-like catalyst [Pb 2 BrI 2 ] + [Pb 2+ (imdc 3− )] with exceptional intrinsic stability in water, which demonstrates excellent photocatalytic performance in U(VI) removal, along with outstanding selectivity, stability, and recyclability.
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Journal of Physical Chemistry C
·
2023
·
IF 3.7
Alhadi Ishag,Yanxue Yue,Weiyu Zhu,Chongyu Li,Bo Zhang,Xinshui Huang,Yubing Sun
A novel nanoscale zero-valent iron/molybdenum disulfide (nZVI/MoS2) composite was synthesized and well characterized in detail. The as-prepared materials were applied for the removal of U(VI) from water solutions under various experimental conditions. The characterizations showed that nZVI/MoS2 composites exhibited a high surface area and uniform distribution of nZVI. The maximum adsorption capacities of nZVI/MoS2 obtained from the Langmuir model (71.8 mg/g at pH 4.0 and 25 °C) were higher than that of MoS2 (39.92 mg/g) due to the synergistic effect. According to the fitting of surface complexation modeling, U(VI) removal on nZVI/MoS2 included cation exchange and inner-sphere surface complexation at low and high pH, respectively, whereas the adsorbed U(VI) was partly reduced into U(IV) by nZVI/MoS2 composites. According to analysis of XPS analysis, the enhanced removal of U(VI) on nZVI/MoS2 was due to the complexation of U(VI) with various oxygenated functional groups (e.g., −OH, Fe–O, and Mo–O functional groups) and then adsorbed U(VI) was reduced to U(IV) by Fe0 and/or Fe(II). These findings showed that nZVI/MoS2 could be used as efficient adsorbents for the high elimination of U(VI) from contaminated wastewater in environmental pollution cleanup.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Ziyan Yang,Chenhao Qi,Peiling Yuan,Rui Hu,Xin Du,Meng Cheng
Given the efficient reaction of P-containing species with radionuclide U(VI), phosphate-modified carbon nitrides (GPCNs) were prepared with enhanced surface areas (16.9–102.0 m 2 /g) and abundant phosphate groups (15.8–9.1 at% of P) and applied to capture aquatic U(VI). GPCNs presented a fast equilibrium of 8 h, efficient capture capability (maximum 333.5 mg/g at pH 5.0 and T 278 K), excellent selectivity and favorable reusability. The enrichment of U(VI) from the artificial nuclide wastewater (101.5 mg/g) and seawater (89.3 mg/g) were evaluated. Spectroscopic studies proved that the formation of hydrogen uranite was dominant for the high-efficiency selective sorption of U(VI). Under the illumination of visible-light, GPCNs showed a ∼4.9-fold faster kinetics for the photocatalytic reduction of U(VI) than CNs. Moreover, the origin of the photocatalytic activity of GPCNs including the role of phosphate modification was also discussed in detail. This study provided a valuable reference for the facile preparation of porous phosphate-modified carbon nitrides as well as a meaningful option for the extraction of radionuclides from aqueous solutions.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Lijun Guo,Liangqiong Peng,Jiheng Li,Wenhua Zhang,Bi Shi
Thorium (Th) and uranium (U) separation remains a huge challenge due to their high similarity in chemical behavior. In this study, lignin-derived magnetic biochar (AL-Fe/BC), which can provide functional sites for adsorbing Th(IV) and U(VI), was synthesized for the selective extraction of Th(IV) from the binary U(VI)-Th(IV) matrix. Characterizations results confirm the successful zero-valent iron loading, and the AL-Fe/BC exhibited a developed polyporous structure, high surface area, stable crystallinity, high defects degree, and advantageous magnetic feature of expedient recovery from water without energy consumption. The optimist AL-Fe/BC-800 showed an outstanding adsorption capacity with a maximal Th(IV) uptake of 2000 mg/g, and a small absorption of 3 mg/g of U(VI) (Th(IV) = 180 mg/L, U(VI) = 20 mg/L, AL-Fe/BC-800 = 0.05 g/L). Moreover, the separation factor of Th(IV) from the Th(IV)-U(VI) matrix reached 90,000 even concomitant with high a concentration of co-existing ions. The active adsorption sites on AL-Fe/BC-800, such as COOH, C-OH, C=O, pyridinic N, graphitic N, and pyrrolic N, exhibited a stronger binding affinity with Th(IV) than U(VI), achieving selective Th(IV) adsorption via a chemisorption process on the basis of competitive adsorption. In summary, AL-Fe/BC-800 is a potential adsorbent in industrial application for the superefficient separation of Th(IV) and U(VI) with high-performance magnetic recovery, promoting the sustainable development of nuclear industry, especially considering the necessary development of Th(IV) fuel.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Hongwei Pang,Zhuofan Diao,Xiangxue Wang,Yan Ma,Shujun Yu,Hongtao Zhu,Zhongshan Chen,Baowei Hu,Jianrong Chen,Xiangke Wang
Nanoscale zero-valent iron (NZVI) has been considered as a potential scavenger for U(VI) elimination from aqueous environment. To decrease the aggregation and to improve antioxidation, sulfidation technology and biochar were applied to modify NZVI. In this work, Dictyophora indusiate -derived biochar supported sulfide NZVI (DI-SNZVI) was synthesized and applied for U(VI) elimination. The excellent behaviors of kinetics (3 h for equilibrium), thermodynamic research and maximum removal amounts (427.9 mg·g −1 at pH = 5.0 and 298 K) revealed the outstanding performances of DI-SNZVI in U(VI) removal. The cycle experiments and different water system investigations further illustrated its potential ability for real applications. Moreover, the abundant functional groups and FeS x shell of DI-SNZVI were proved to be responsible for the enhanced removal of U(VI). In the end, the macroscopic and XPS study revealed that U(VI) elimination mechanisms were synergistic attributed to the adsorptive and reductive processes. This paper highlighted the biochar-based sulfide NZVI for efficient U(VI) elimination in environmental pollution management.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
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IF 3.141
Hui Zhang,Zhongran Dai,Yang Sui,Nieying Wang,Haiying Fu,Dexin Ding,Nan Hu,Guangyue Li,Yongdong Wang,Le Li
The impregnated water at a uranium tailings repository has characteristics that its uranium concentration is low and it contains many other interfering ions. In order to develop an efficient adsorbent for such wastewater, Mg-Al layered double hydroxide (Mg-Al-NO3-LDH) and tripolyphosphate intercalated LDH (TPP-LDH-1 and TPP-LDH-2) were synthesized by an anion exchange method and characterized by using multiple analysis techniques, and their behavior and mechanism for U(VI) removal from aqueous solutions were investigated. It is found that their adsorption capacities for U(VI) follow the order Mg-Al-NO3-LDH < TPP-LDH-1 < TPP-LDH-2. The maximum sorption capacities of Mg-Al-NO3-LDH, TPP-LDH-1, and TPP-LDH-2 for U(VI) at pH 5.0 and 298.15 K derived from the Langmuir model are 201.27, 399.01, and 501.76 mg/g, respectively. In addition, tripolyphosphate intercalated LDH show a higher sorption selectivity toward U(VI) over other metal cations and anions. X-ray photoelectron spectroscopy (XPS) and Fourier transform-infrared spectroscopy (FT-IR) characterizations suggest that the higher adsorption capacity and sorption selectivity of TPP-LDH-2 are probably due to the inner-sphere surface complexes resulting from the phosphate groups (P═O, −PO3) with U(VI). The applicability of TPP-LDH-2 for scavenging of U(VI) from the impregnated water at a uranium tailings repository in South China was further evaluated. It is found that TPP-LDH-2 shows excellent removal efficiency for U(VI). The results indicate that tripolyphosphate intercalated LDH is a promising adsorbent for scavenging of U(VI) from the impregnated water at the uranium tailings repository.
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