JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2025
·
IF 1.6
Gui Yunyang,Ruan Hui,Wang Haitao,Li Tiantian,Liu Yanrui,He Teng,Xue Yun,Ma Fuqiu,Liu Peng
A novel amidoxime and polyamine bifunctional modified polyacrylonitrile-polyamidoxime-based fiber adsorbent (PAN-PAO-NH 2 -AO) was prepared using wet-spun and hydrothermal methods. The structure, morphology, and properties of the fibers were characterized by various methods to demonstrate the attachment of amidoxime and polyamine groups onto the fibers. The highest adsorption capacity of the material reached 236.3 mg/g at pH 5 and 298 K. The study of the adsorption mechanism of the fibers showed that the lone pair of electrons of the N and O atoms coordinated with U(VI) by XPS. The results show that PAN-PAO-NH 2 -AO fibers are a potential decontamination material for uranium-containing wastewater.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2025
·
IF 9
Nijuan Liu,Hongping Zhang,Fupeng Jin,Hao Liang,Duoqiang Wang,Yuanzhuo Li,Ruijuan Wang,Wei Tian,Ruibin Guo,Zunli Mo
Photocatalytic technology plays a critical role in uranium extraction by converting soluble U(VI) into insoluble U(IV), underscoring the need to develop efficient catalysts for the photoreduction of U(VI) in aqueous environments. To address this challenge, researchers have developed core–shell MoO 3-X @ZnIn 2 S 4 (M@ZISn) photocatalysts, co-regulated through homometallic ion doping and heterojunction engineering, for U(VI) extraction. The M@ZIS 0.5 photocatalyst demonstrated outstanding performance, achieving a removal rate of 98.84 % and a removal capacity of 296.52 mg·g −1 within 90 min. Optical characterization revealed that its superior photocatalytic activity stems from three key factors: (1) Mo 5+ doping and heterojunction formation effectively suppressed the recombination of photogenerated electron-hole pairs, (2) the core–shell structure provided an efficient pathway for the transfer of photogenerated carriers, and (3) Density Functional Theory (DFT) calculations confirmed that homometallic ion doping and heterojunction engineering optimized the semiconductor’s bandgap structure and enhanced its performance. Notably, when applied to spiked natural water samples (from the Yellow River, Salt Lake, and seawater), the M@ZIS 0.5 catalyst maintained a high removal rate of 78.82 %, demonstrating its potential for practical applications in real-world water systems.
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ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Minhua Su,Shuwen Wang,Jiaqi Pan,Miaoling Chen,Congjie Shen,Yanrong Lai,Jiaxue Zhao,Jingran Yang,Diyun Chen,Ying Zhou
The extraction of uranium (U) from wastewater is of vital importance for ensuring the sustainable and safe development of nuclear energy, as it addresses both environmental protection and resource recycling. Vanadium (V) and its compounds are extensively employed in iron and steel manufacturing, and their utility in pollutant remediation further promotes the circular use of V-bearing materials. However, studies on utilizing inexpensive and readily available vanadium oxides (e.g., V 2 O 5 ) for the treatment of highly acidic uranium-containing wastewater remain scarce. This study investigated the effectiveness of V 2 O 5 in removing U(VI) and immobilizing it into crystalline uranyl vanadates, providing the first confirmation of the feasibility of using V 2 O 5 for uranium elimination and capture. The results indicate that V 2 O 5 exhibits excellent extraction capacity and selectivity for uranyl ions in contaminated solutions, achieving a U(VI) extraction rate exceeding 97% even under highly acidic conditions ( e.g. , pH = 2.0). Adsorption equilibrium was attained within 250 min, and kinetic studies combined with model fitting indicated that the process was governed by both intra-particle diffusion and chemical adsorption mechanisms. It was discovered that the captured U(VI) was ultimately incorporated into a stable crystalline phase, identified as uvanite (U 2 V 6 O 21 ·15H 2 O), through a coprecipitation pathway, revealing a novel crystallization mechanism. The overall immobilization process was attributed to the synergistic effects of chemical adsorption and coprecipitation. These findings support the development of vanadium oxide-based technologies for U(VI) purification and recovery from complex wastewater.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2019
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IF 6.361
Qi Zhang,Donglin Zhao,Shaojie Feng,Yangyang Wang,Jie Jin,Ahmed Alsaedi,Tasawar Hayat,Changlun Chen
In this study, chitosan (CS) loading well-dispersed nanoscale zero-valent iron (NZVI/CS) was successfully prepared via the liquid-phase reduction method. Characterizations of the NZVI/CS with high-resolution transmission electron microscopy and X-ray diffraction suggested that the as-prepared NZVI/CS comprised numerous dispersed Fe 0 nanoparticles . Synergistic adsorption and reduction occurred during the removal process based on X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy . Influence of pH, contract time and temperature on U(VI) removal were investigated. The high removal capacity and rapid removal kinetics were predominately ascribed to the existence of well-distributed NZVI, which could rapidly reduce U(VI) into U(IV). The removal process could be better depicted by the Langmuir isotherm model and the pseudo-second-order kinetic model. The thermodynamic parameters showed that the removal process was exothermic. These findings indicate that the synthesized NZVI/CS composites have potential application for the removal of U(VI) from the sewage water.
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EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2023
·Vol. 26
·期 22
·e202300121
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IF 2.3
Yixin Pan,Pengkun Zhang,Rui Huang,Jisheng Kou
Graphical A novel nanocomposite (TNTs-FeS) was developed for removal of U(VI) and Re(VII) from aqueous solutions. Experiment results revealed that TNTs as a stabilizer for FeS had good stability and prevention FeS agglomeration. The pseudo-second-order kinetic model was both able to adequately interpret the experimental rate data of U(VI) and Re(VII) removal. The U(VI) adsorption affected by the coexisting ions (Cd 2+ and Cu 2+ ) significantly due to competitive adsorption. A novel nanocomposite (TNTs-FeS) was developed by anchoring ferrous sulfide (FeS) nanoparticles immobilized on titanate nanotubes (TNTs) by hydrothermal method to remove U(VI) and Re(VII) from aqueous solution, and the removal mechanism and efficiency were examined. The experimental results showed that the TNTs can effectively improve the dispersibility and stability of FeS. The environmental conditions, including initial solution pH, initial concentration, equilibrium time, and dosage, played an important role in the remediation process, which can affect the immobilization efficiency significantly. The maximum quantity removal of U(VI) and Re(VII) was 291.67 and 226.23 mg/g at pH of 6.0 and 12.0. The adsorption kinetics and the equilibrium isotherms of U(VI) and Re(VII) all fitted well with the pseudo-second-order model ( R 2 >0.99) and the Freundlich model ( R 2 >0.99). The main mechanism of removal by TNTs-FeS was electrostatic attraction, chemical reduction, and surface complexation. Thus, TNTs-FeS composites exhibited a high potential to remove U(VI) and Re(VII) heavy metal ions from the surface and groundwater.
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CHEMICAL ENGINEERING JOURNAL
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2026
·
IF 12.5
Yuxiang Deng,Zhenyu Cai,Libo Yang,Zhiyao Wu,Bihong Chen,Chang Gao,Xinyu Yu,Nannan Wang,Xinpeng Wang
3DOM-TiO 2 /CuO S-scheme heterojunction synthesized via hard templating • Removes 99.06% U(VI) in 120 min; capacity of 1751.33 mg/g • Dynamic Cu valence change & O-vacancy evolution restrain charge recombination. • In situ multi-spectra & DFT reveal charge transfer and U(VI) reduction mechanism. Photocatalysis offers a sustainable approach for uranium-containing wastewater remediation, yet conventional materials still suffer from limited solar-light utilization and rapid charge recombination. Herein, a three-dimensional ordered macroporous TiO 2 /CuO composite (3DOM-TC) was synthesized using resorcinol–formaldehyde resin spheres as a hard template. The ordered macroporous TiO 2 framework enables slow-photon-assisted light harvesting and multiple light scattering, while CuO coupling broadens the light-response range and constructs an S-scheme TiO 2 /CuO heterojunction to promote directional charge separation. Meanwhile, oxygen vacancies mainly serve as electron-trapping and O 2 /intermediate adsorption–activation sites, which are coupled with the dynamic Cu 2+ /Cu + variation during photocatalysis. As a result, 3DOM-TC achieves 99.06% U(VI) removal within 120 min, corresponding to a maximum extraction capacity of 1751.33 mg/g. Photoelectrochemical tests confirm enhanced photocurrent density and efficient interfacial charge transport compared with pristine TiO 2 . In situ EPR, XPS, and DFT calculations reveal the photoinduced charge-transfer pathway and illumination-enhanced oxygen-vacancy signals. Moreover, in situ FTIR spectroscopy confirms that photogenerated ·O 2 − can further convert to H 2 O 2 -related species, thereby promoting U(VI) precipitation as (UO 2 )O 2 ·4H 2 O. This work highlights the synergistic integration of 3DOM-enabled light harvesting, S-scheme charge separation, and vacancy-assisted electron transfer and O 2 activation, providing a promising strategy for efficient photocatalytic U(VI) sequestration. Download: Download high-res image (232KB) Download: Download full-size image
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Weijuan Guo,Ling Yan,Jianhua Qian,Can Luo,Ye Ren,Wei Xie,Jianfen Cai,Jing Ding,Muqing Qiu,Baowei Hu
Herein, covalent organic frameworks (i.e., TpBD) were fabricated by mechanical delamination of 1, 3, 5-triformylphloroglucinol (Tp) and benzidine (BD) using NaHCO 3 as foaming agent. The batch characterizations revealed that flower-like TpBD nanosheets exhibited the large porosity, high BET specific area (139 m 2 /g), small pore size (∼ 14 Å), remarkable stability and keto form. The adsorption process of U(VI) removal by TpBD displayed the fast sorption rate (equilibrium within 0.5 h), high adsorption capacity (167 mg/g) and good re-usability (no significant difference after five cycles). According to analysis of X-ray photoelectron spectroscopy (XPS) and surface complexation modeling, the removal mechanism of U(VI) by TpBD was chemisorption and inner-sphere surface complexation. These findings are of great importance for the application of covalent organic frameworks fabricated with rapid and easy-to-operate mechanochemical method in actual environmental cleanup .
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2022
·Vol. 331
·期 6
·2469-2478
·
IF 1.754
Wang Chen,Xi Wenke,Guo Ruoxuan,Wang Siyi,Lu Wen,Bai Yuxuan,Wang Jianjun
This work fabricated a novel two-dimensional (2D) amidoxime-functionalized covalent organic framework (COF) (named HDU-102-AO) for U(VI) extraction. It had a spiny rod structure, high crystallinity, appreciable specific surface area, excellent pore size structure and exceptional stability. Batch experiments demonstrated HDU-102-AO had an impressive capacity for adsorbing uranyl ions, up to 389.08 mg g −1 . It maintained a high adsorption ability at a wide pH range, with an ultra-high selectivity toward interfering ions. In summary, HDU-102-AO with excellent stability and adsorption performance, provided a practicable way for COF preparation, and could be served as a potential adsorbent for uranium adsorption.
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JOURNAL OF HAZARDOUS MATERIALS
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2023
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IF 13.6
Peng Wu,Xiaoyu Yin,Yufan Zhao,Feize Li,Yuanyou Yang,Ning Liu,Jiali Liao,Tu Lan
The reduction of soluble U(VI) to insoluble U(IV) precipitates by visible light is an environmentally friendly and highly effective strategy to remove uranium from uranium-containing radioactive wastewater . Herein, a porous hydrogen-bonded organic framework (HOF) of UPC-H4a was self-assembled by intermolecular hydrogen bonds of 5,10,15,20-tetra(4-(2,4-diaminotriazine)phenyl) porphyrin to remove U(VI) from aqueous solution. UPC-H4a has high crystallinity with permanent porosity, excellent photocatalytic property, good chemical stability, and strong photocatalytic reducibility. The experiments showed that UPC-H4a removed 98.18% of U(VI) after illumination for 120 min, with high selectivity , strong ion interference resistance, and good reusability. A real low-level radioactive wastewater was employed to estimate the potential of UPC-H4a for practical application and its removal rate can reach 66.14% in the presence of redox competing metal ions , exhibiting great potential for practical application. The DFT calculations and EPR spectra revealed that a more negative electrostatic potential of DAT-porphyrin and the formed intermolecular hydrogen bonds in UPC-H4a can facilitate the participation of photogenerated electrons in the O 2 /∙O 2 – reaction, and the radical of ∙O 2 – was proved to be the critical participant in U(VI) photoreduction . The discovery of UPC-H4a in this work will help to develop more potential applications of HOFs as photocatalysts in radioactive wastewater treatment .
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Peng Cheng,Zhiyang Wei,Yara Arbid,Tengfei Fu,Xiaowei Liu,Olivier Monfort
The primary aim of this work is to test a novel adsorbent prepared by cross-linking of tetrafluoroterephthalonitrile with chitosan (CS-TFT) for the removal of Cr(VI) and U(VI). The CS-TFT is stable until 250 °C and possesses amino functional groups due to the presence of CS that remain intact even after the cross-linking reaction, thus being a benefit for adsorption properties; while the TFT brought roughness to CS-TFT that keeps its high porosity. The adsorption efficiency of CS-TFT is evaluated in the batch experiment of Cr(VI) and U(VI) adsorption along with the effect of different experimental parameters (pH, time, temperature, initial concentrations, and co-existing inorganic cations). The maximum adsorption capacity of CS-TFT for adsorption of Cr(VI) and U(VI) was 265.96 mg·g -1 at pH = 3 and 346.06 mg·g -1 at pH = 5, respectively, at 298 K and the corresponding partition coefficients were 12,454 and 6181 mg g -1 mM -1 , respectively. The kinetics of the adsorption process is identified as a pseudo-second-order model and the Langmuir isotherm model is considered. The CS-TFT shows satisfactory reusability since it can be used after 6 cycles of regeneration with a removal efficiency of Cr(VI) and U(VI) higher than 90 %. The adsorption mechanism is also proposed based on investigation of CS-TFT by FTIR, XPS and SEM-EDS before and after adsorption. The results show that hydroxy (–OH) and amino (–NH 2 ) groups play a key role in the chemical adsorption . All these findings suggest that CS-TFT could be a promising adsorbent for wastewaters treatment .
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Yihan Wu,Biyun Li,Xiangxue Wang,Shujun Yu,Hongwei Pang,Yue Liu,Xiaoyan Liu,Xiangke Wang
The water stable core-shell microspheres (Fe 3 O 4 @ZIF-8) with strong magnetism were successfully fabricated through a facile modification strategy. Concrete procedures included firstly pretreatment of Fe 3 O 4 core with anionic polyelectrolyte to acquire negatively charged Fe 3 O 4 particle surface, followed by nucleation through attracting Zn 2+ cation, and then growth of a thin layer of ZIF-8 (~25 nm). Various characterization techniques (SEM, TEM, FT-IR, XRD, VSM, BET and XPS) indicated that the Fe 3 O 4 @ZIF-8 microspheres were highly stable and magnetic with a large specific surface area (606.91 m 2 /g) and fairly sufficient functional groups ( NH , OH, COOH, Zn O, N O and C N ). Multi-factors affecting the radionuclides removal performance on Fe 3 O 4 @ZIF-8 was adequately explored, comprising contact time, temperature, pH, ionic strength, co-existing ions and extreme conditions. And the results showed that Fe 3 O 4 @ZIF-8 exhibited fast reaction kinetics (~30 min to achieve equilibrium), excellent uptake capabilities (539.7 mg U/g and 255.6 mg Eu/g), remarkable selectivity and favorable physicochemical stability. These researches suggested that Fe 3 O 4 @ZIF-8 could not only simultaneously achieve favorable stability and functionality, but also easily to be separated by external magnetic field after used in radioactive sewage treatment, which was of considerable practical utility in extracting radioactive wastes though in harsh circumstance.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Tingting Li,Yihong Xu,Fang Wang,Liangshu Xia
The separation and enrichment of uranium from uranium containing wastewater is important for the sustainable development of nuclear energy. Therefore, there is an urgent need to develop a low-cost, readily available, simple preparation process and environmentally friendly adsorbent. In this study, potassium manganese ferrocyanide and carbon nanotube encapsulated calcium alginate beads (KMnFC/CNT@SA) for uranium adsorption was prepared by a simple method using the inexpensive natural polymer material sodium alginate and the ion exchange material potassium manganese ferricyanide as well as carbon nanotubes capable of enhancing the spatial structure. Static adsorption experiments show that the adsorption capacity of KMnFC/CNT@SA for uranium is significantly affected by pH, contact time, U(VI) concentration and temperature, but is not affected by sodium ion concentration in solution. Furthermore, desorption and cycling tests demonstrate that KMnFC/CNT@SA has good reusability, with the adsorption capacity remaining above 89.83% of the maximum adsorption capacity after 10 adsorption-desorption cycles. It is worth noting that KMnFC/CNT@SA can adsorb uranium well under acidic conditions, and is easy to solid-liquid separation and recovery. This work provides an effective strategy for the development of high-quality, inexpensive, practical and durable adsorbents for uranium extraction from acidic uranium-containing wastewater.
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