Biochar
·
2023
·Vol. 5
·期 1
·1-16
·
IF 12.7
Liu Fenglei,Wang Shanshan,Zhao Chaofeng,Hu Baowei
Herein, a biochar-based composite (Ti 3 C 2 T x @biochar-PDA/PEI) was constructed by decorating Ti 3 C 2 T x and polydopamine on coconut shell biochar via electrostatic self-assembly method. Different characterization techniques were applied to explore the structure, morphology and composition of the sorbents. It was found that the higher porosity and diverse functional groups were conducive for Ti 3 C 2 T x @biochar-PDA/PEI to capture radionuclides, and the water environmental conditions made a great contribution to the adsorption process. The process of removing U(VI)/Cs(I) well complied with the Langmuir isotherm and Pseudo-second-order equations, which indicated that the single layer chemical adsorption occurred on the solid liquid interface. Meanwhile, this produced composite exhibited superior removal performance under complex co-existing ion environment, and the maximum adsorption amounts of U(VI) and Cs(I) reached up to 239.7 and 40.3 mg g −1 . Impressively, this adsorbent still exhibited good adsorption performance after three cycles of regeneration. The spectral analysis and DFT calculation demonstrated that adsorption of U(VI) might be a chemical process, while the adsorption of Cs(I) should be ion exchange or electrostatic attraction. This study demonstrated the potential application of Ti 3 C 2 T x @biochar-PDA/PEI as an effective remediation strategy for radioactive wastewater cleanup. Graphical Abstract
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Fenglei Liu,Anjie Wang,Miao Xiang,Qingyuan Hu,Baowei Hu
Herein, a magnetic amine-functionalized mesoporous silica SBA-15 (Fe 3 O 4 @SBA-15-PDA/HBP-NH 2 ) adsorbent was fabricated by loading Fe 3 O 4 nano-particles on amino-terminated hyperbranched polymers (HBP-NH 2 ) functionalized SBA-15 and exploited for chromium (VI) and uranium (VI) elimination. The morphologies and microstructures of as-obtained materials were observed using different physicochemical and spectroscopic techniques. Meanwhile, batch experiments were performed to investigate the impacts of various water environment conditions on removal process including solution pH, equilibrium time and temperatures. The maximum adsorption capacities of U(VI) and Cr(VI) on Fe 3 O 4 @SBA-15-PDA/HBP-NH 2 reached up to 77.4 mg/g and 66.5 mg/g under optimal water environment conditions. Moreover, the characterization analysis manifested that removal of U(VI) was fulfilled through the surface complexation with amino and phenolic hydroxyl groups, while Cr(VI) were firstly electrostatically adsorbed, and subsequently reduced to less toxic Cr(III) by phenolic hydroxyl groups. These findings demonstrated that this new magnetic amine-functionalized SBA-15 could be considered as valuable materials in environmental cleanup.
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JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Siyi Wang,Lin Wang,Zijie Li,Pengcheng Zhang,Ke Du,Liyong Yuan,Shunyan Ning,Yuezhou Wei,Weiqun Shi
A novel composite of zero-valent iron nanoparticles supported on alkalized Ti 3 C 2 T x nanoflakes (nZVI/Alk-Ti 3 C 2 T x ) was constructed by an in-situ growth method for simultaneous adsorption and reduction U(VI) from aqueous solution in anoxic conditions . The effect of various factors such as adsorbent dose, pH, ionic strength, contact time, initial U(VI) concentration and environmental media were comprehensively investigated by batch experiments. Benefiting from the good dispersion uniformity of nZVI on MXene substrates, nZVI/Alk-Ti 3 C 2 T x exhibited rapid removal kinetics, excellent selectivity , 100% removal efficiency and up to 1315 mg g −1 uptake capacity for U(VI) capture. In the presence of mimic groundwater, 1.0 mM NaHCO 3 and 10 mg L −1 humic acid , the removal percentages of U(VI) by the composites could reach 95.1%, 88.9% and 69.5%, respectively. The reaction mechanism between U(VI) and nZVI/Alk-Ti 3 C 2 T x has been clarified based on FTIR , XANES , XPS and XRD analysis. Depending on the consumption of reactive nZVI in the composites and the solution pH, the elimination of U(VI) could be realized by different pathways including reductive immobilization in the form of UO 2 , inner-sphere surface complexation and hydrolysis precipitation. The present study illustrates that the nZVI/Alk-Ti 3 C 2 T x composite may be an efficient scavenger for radioactive wastewater purification in environmental remediation.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Liping Liang,Yun Zhang,Fenfen Xi,Songhua Lu,Jianfeng Ma
The photocatalytic reduction of soluble U(VI) to insoluble U(IV) is an effective method for the treatment of uranium-containing wastewater. This study focuses on developing an efficient catalyst for the photocatalytic reduction of U(VI). Herein, FeS was synthesized by liquid-phase precipitation and modified onto BiFeVO 4 . The results demonstrated that the BiFeVO 4 -to-FeS mass ratio of 1:1 combined with a material aging time of 24 h (denoted as BiFeVO 4 /FeS-24) achieved the highest U(VI) reduction efficiency under visible light, which was mainly attributed to the adsorption and reduction of U(VI) by FeS, and the reduction of U(VI) by photo-induced electron and •O 2 − . Notably, the U(VI) removal efficiency of BiFeVO 4 /FeS-24 (84.3 %) was significantly higher that of BiFeVO 4 (9.1 %) and FeS (56.7 %) alone. The maximum U(VI) adsorption capacity of the material is 87.26 mg/g in the dark reaction stage, whereas its maximum U(VI) removal capacity reaches 301.2 mg/g under visible light. BiFeVO₄/FeS-24 maintains high removal efficiency even after five reuse cycles, indicating its high stability and excellent recyclability. The photocatalytic reduction mechanism of U(VI) by BiFeVO 4 /FeS-24 was elucidated through XPS, Mott-Schottky, EIS, I-t, and EPR. These analyses revealed that the excellent photocatalytic performance of BiFeVO 4 /FeS-24 in U(VI) removal stems from crystal structural integration and the formation of a Z -scheme heterojunction, which effectively narrows the band gap, enhances visible light absorption, and facilitates the separation of photogenerated electron-hole pairs. Overall, this study provided a simple approach for the effective removal of U(VI) from uranium-containing wastewater.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Di Zhang,Lijie Liu,Zixuan Ma,Hairui Hou,Xiangxue Wang,Shujun Yu
Seawater is rich in uranium resources, but the marine environment is complicated and changeable, as well as the presence of a lot of competing ions. These are disturbing factors that cannot be ignored in seawater uranium extraction. The synthesis of adsorbents with good stability, high selectivity and large adsorption capacity has been the focus of attention. The composite adsorbent MXene-AO@LZU1 was prepared using electrostatic self-assembly of transition metal carbides and nitrides (MXenes) with structurally stable covalent organic frameworks (COF-LZU1). The results of characterizations showed that MXene-AO@LZU1 was rich in functional groups and had an effective improvement in specific surface area . MXene-AO@LZU1 exhibited an efficient performance for [UO 2 (CO 3 ) 3 ] 4- with an adsorption saturation capacity of 88.8 mg·g −1 . The adsorption amount in the simulated seawater also reached 6.8 mg·g −1 . MXene-AO@LZU1 had a good selectivity for uranium and outstanding stability under various extreme conditions. In addition, XPS showed that the adsorption of uranium by MXene-AO@LZU1 relied mainly on the complexation of oxygen/nitrogen-containing functional groups with [UO 2 (CO 3 ) 3 ] 4- . This study explored the great potential of MXenes and COFs in seawater uranium extraction, indicating that MXene-AO@LZU1 was an efficient and stable adsorbent with good development prospects. This finding was of great importance for the application of composite materials in actual environmental cleanup, and could be extended to efficiently remove other pollutants by rational ligands design.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2026
·
IF 1.7
Chen Cheng,Xian Pengcheng,Yang Yanjing,Huang Liang,Fan Fengyao,Lu Chunhai
A hydroxyapatite-bamboo biochar (HAP-BBC) composite was synthesized via pyrolysis and co-precipitation for efficient U(VI) removal from aqueous solution. Batch experiments demonstrated that over 98% removal efficiency for 50 mg L −1 U(VI) was achieved at pH 4.0–5.0 with an adsorbent dosage of 0.3 g L −1 . The adsorption process fitted well with the Langmuir isotherm and pseudo-second-order kinetic model, with a theoretical maximum adsorption capacity of 649.35 mg g −1 . U(VI) immobilization follows synergistic mechanisms of dissolution–precipitation, surface complexation and ion exchange, endowing the composite with promising prospects for uranium-containing wastewater treatment.
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Yu Liu,Changting Chen,Chengzuo Liu,Jianan Zeng,Jianqiang Luo,Xiaolan Tong,Xuejiao Peng,Shujuan Liu,Jianguo Ma
Constructed a type-II CoNC@CdS heterojunction for PEC reduction of U(VI). • PEC reaction rate was 12.8 times that of photocatalysis alone. • Built-in electric field and bias synergistically promoted charge separation. • Soluble U(VI) was efficiently converted to insoluble UO 2 precipitate. Photoelectrocatalytic (PEC) reduction of U(VI) is an effective strategy for treating uranium contamination in water. Herein, a CoNC@CdS type-II heterojunction electrode was designed for the efficient reduction of U(VI) via a PEC process. Under optimized conditions, the fabricated electrode delivers an outstanding U(VI) removal efficiency of 97.8%, accompanied by a pseudo-first-order kinetic rate constant of 0.0349 min −1 . The PEC reaction rate of CoNC@CdS is 20.1 and 12.8 times higher than that of single electrocatalysis and photocatalysis systems, respectively. Stability evaluation reveals that even after six successive cyclic tests, the U(VI) removal efficiency remains above 80%, demonstrating robust cycling durability. Mechanism characterizations elucidate that CoNC improves electrode conductivity and light absorption capability, while layered CdS shortens charge migration distance and restrains carrier recombination. The built-in electric field of type-II heterojunction combined with external bias drives spatial separation and directional transport of photogenerated charge carriers, thereby efficiently converting soluble U(VI) into insoluble UO 2 precipitates. This work provides a promising strategy for uranium recovery and remediation in complex aqueous matrices.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2026
·
IF 1.7
Sun Yubing,Zeng Nalan,Zhu Weiyu,Tang Shuai,Lu Xirui
The combined pollution of radionuclides, heavy metals and organics during uranium mining (i.e., association/coexist with heavy metals) or reprocessing of spent fuel (i.e., organic extraction) has become a prominent issue nowadays. Herein, the synergetic removal mechanism of U(VI), Cr(VI) and bisphenol(BPA) on porous covalent organic framework/graphitic carbon nitride (COF/g-C 3 N 4 ) was investigated using optical, microscopic and spectroscopic techniques. Compared to g-C 3 N 4 (1%), the high photocatalytic reduction (77%) and the excellent stability (90% after 5 recycles) of U(VI) on COF/g-C 3 N 4 could be attributed to the highly efficient separation of photogenerated carrier and wide response range of COF/g-C 3 N 4 under visible light (low band gap of 1.98 eV). In the ternary system, the increased removal of U(VI) on COF/g-C 3 N 4 was due to the consumption of h + by Cr(VI) and BPA, whereas the further increase of Cr(VI) and BPA inhibited U(VI) removal due to the competition of active sites. The interaction mechanism of U(VI) on COF/g-C 3 N 4 was ascribed to superoxide radicals by trapping and XPS analysis. These findings are crucial for the actual application of COF/g-C 3 N 4 on simultaneous removal of radionuclides, heavy metals and organic in complexed systems. Graphical abstract
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高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Hao Lei,Daohui Zhou,Jiao Tang,Xiaoping Hu,Ning Pan,Hao Zou,Fangting Chi,Xiaoqiang Wang
A novel approach to synthesize phytic acid (PA) functionalized graphene oxide (P-pFGO-7) treated by the photo-Fenton reaction has been designed, which has been used as an adsorbent for efficient capture of U(VI) from aqueous solution. The structure and morphology of P-pFGO-7 were characterized well. The adsorption property for P-pFGO-7 was comprehensively assessed by batch experiments, showing the high adsorption capacity (266.7 mg/g, at pH = 4.0, T = 298 K), fast adsorption kinetics (~10 min), good selectivity for U(VI) and Ln-An ions in various coexisting ions and excellent regeneration capacity. With the assistance of various characterization techniques and batch adsorption results, it is found that PA makes the most contribution to coordinate U(VI) heavily depending on the P O moiety. P-pFGO-7 could be regenerated by 0.1 mol/L Na 2 CO 3 with ~95% desorption efficiency and reused well after five recycles. This present work provides a feasible route to modify graphene oxide and extend PA for potentially practical application in the removal of U(VI) from radioactive wastewater .
研究领域:
环境化学
·
核科学与技术
·
材料科学
·
水处理技术
·
放射化学
·
纳米材料
·
吸附科学
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高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2023
·Vol. 332
·期 2
·325-335
·
IF 1.6
Tao Qinqin,Lin Shan,Bai Tengsai,Xie Jinhua,Dai Ying
An inorganic adsorbent with conveniently recovery performance is attractive in the treatment of uranium-containing wastewater. Herein magnetic Mg–Al layered double hydroxide composites (Mag-LDHs) and its calcination compound, Mag-LDHs (Mag-LDO), have been successfully prepared. Their physicochemical characteristic was analyzed with XRD, SEM, XPS, VSM, FT-IR, TGA, Zeta potential and N 2 adsorption–desorption isotherms. The adsorption behavior of both adsorbents toward uranium were investigated. The solid–liquid separation could be conveniently achieved by external magnetic field. The maximum theoretical adsorption capacities toward U(VI) were 436.16 mg/g for Mag-LDHs and 317.71 mg/g for Mag-LDO. The adsorption capacity of Mag-LDHs and Mag-LDO retained 80.72% and 85.58% even undergoing five adsorption–desorption cycles. The study proposed Mag-LDHs and Mag-LDO as alternative uranium-specific adsorbents applicable in the acid wastewater (pH = 5.5).
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高影响因子
Progress in Natural Science-Materials International
·
2023
·
IF 4.7
Siyi Wang,Yuxuan Bai,Zhixiong Zhang,Chengde Xie,Wenhui Song,Chen Wang,Zhuoyu Ji,Jianjun Wang
In this study, the one-dimensional nanomaterial α-MnO 2 @ZIF-8 was satisfactorily fabricated using a simple hydrothermal method by modifying ZIF-8 on α-MnO 2 nanowires for high-performance extraction of U(VI) out of water solution. The experimental data indicated that the adsorption of U(VI) on α-MnO 2 @ZIF-8 was intensely dependent on solution pH but not on ionic strength . The maximum adsorption of U(VI) on α-MnO 2 @ZIF-8 at pH = 5.0 and T = 298 K was 802.36 mg/g, substantially higher than the adsorption on α-MnO 2 (22.32 mg/g) or ZIF-8(551.31 mg/g) under the same conditions, indicating that the performance of the modified α-MnO 2 was greatly enhanced. Attaining adsorption equilibrium within 45 min, the analytical kinetic process of α-MnO 2 @ZIF-8 indicated that its adsorption on U(VI) was monolayer chemisorption . The adsorption experiments and XPS analyzed the possible adsorption mechanism of U(VI) in the reaction with α-MnO 2 @ZIF-8 during the adsorption process , namely intra-sphere surface complexation, chemisorption and electrostatic interaction . The simple preparation and high removal efficiency of α-MnO 2 @ZIF-8 indicated that this adsorbent had good prospects for application in wastewater.
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高影响因子
Biomass Conversion and Biorefinery
·
2022
·
IF 4.05
Xie Ying,Chen Hongyi,Liao Jun,Zhang Yong
The conversion of sheep manure into biochar was considered as a waste treatment plan as a result of the effective adsorption of U(VI) by using biochar as an economical adsorbent. In this work, two kinds of modified sheep manure–derived biochars (SMB) were obtained by using TiCl 3 and TBT (the modified SMB were called SMB-Ti and SMB-Te, respectively) as titanium source precursors to adsorb U(VI) from wastewater. The introduction of TiO 2 could improve the affinity of biochar for U(VI), enhancing the adsorption performance. The experimental data indicated that SMB-Ti possessed large removal capacity (674.81 mg/g) and high adsorption efficiency (95%). The adsorption behavior was in accord with pseudo-second-order and Langmuir model, indicating the monolayer chemisorption on SMB-Ti. The practical application ability of SMB-Ti was proved by the dynamic adsorption experiments with excellent removal efficiency (> 94%). The effective U(VI) removal was assigned to the chemical complexation and electrostatic attraction. This paper not only offers a proper way for animal manure treatment, but also poses an effective adsorbent for U(VI) adsorption in aqueous solution. Graphical abstract
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