JOURNAL OF HAZARDOUS MATERIALS
·
2016
·
IF 4.836
Ning Pan,Long Li,Jie Ding,Shengke Li,Ruibing Wang,Yongdong Jin,Xiangke Wang,Chuanqin Xia
Manganese dioxide decorated graphene oxide (GOM) was prepared via fixation of crystallographic MnO 2 (α, γ) on the surface of graphene oxide (GO) and was explored as an adsorbent material for simultaneous removal of thorium/uranium ions from aqueous solutions. In single component systems (Th(IV) or U(VI)), the α-GOM 2 (the weight ratio of GO/α-MnO 2 of 2) exhibited higher maximum adsorption capacities toward both Th(IV) (497.5 mg/g) and U(VI) (185.2 mg/g) than those of GO. In the binary component system (Th(IV)/U(VI)), the saturated adsorption capacity of Th(IV) (408.8 mg/g)/U(VI) (66.8 mg/g) on α-GOM 2 was also higher than those on GO. Based on the analysis of various data, it was proposed that the adsorption process may involve four types of molecular interactions including coordination, electrostatic interaction, cation-pi interaction, and Lewis acid-base interaction between Th(IV)/U(VI) and α-GOM 2 . Finally, the Th(IV)/U(VI) ions on α-GOM 2 can be separated by a two-stage desorption process with Na 2 CO 3 /EDTA. Those results displayed that the α-GOM 2 may be utilized as an potential adsorbent for removing and separating Th(IV)/U(VI) ions from aqueous solutions.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2024
·
IF 1.5
Lu Sen,Yin Yuqiang,Bao Jiacheng,Wang Hongqiang,Lei Zhiwu,Hu Eming,Xin Qi,Quan Yihao,Wang Qingliang
In this study, tin sulphide (SnS 2 ) and nickel–chromium hydrotalcite (NiCr-LDH) complexes (SnS 2 /NiCr-LDH) were used for the simultaneous removal of U(VI) and humic acid (HA) from U(VI)-containing wastewater. The results showed that the adsorption of HA by the SnS 2 /NiCr-LDH was greatly enhanced, which was 4.07 and 2.94 times higher than that of pure SnS 2 and NiCr-LDH, respectively, and the highest U(VI) adsorption quantity over SnS 2 /NiCr-LDH increased from 127.81 to 446.68 mg g −1 when HA was present. Density functional theory (DFT) calculations revealed that the enhanced U(VI) adsorption on SnS 2 /NiCr-LDH was facilitated by the formation of a robust inner-sphere surface complex between U(VI) and HA.
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Journal of Water Process Engineering
·
2025
·
IF 6.7
Wei Peng,Xiancai He,Xianlin Chen,Yishuo Zhang,Chunpei Yan,Zhongsheng Chen,Guolin Huang
The combination of adsorption and photocatalysis offers a synergistic strategy for enhanced U(VI) removal. In this study, g-C 3 N 4 /HAP composites were synthesized via a hydrothermal method to achieve efficient U(VI) removal. Hydroxyapatite (HAP) provides abundant adsorption sites for rapid U(VI) enrichment, while graphitic carbon nitride (g-C 3 N 4 ) exhibits excellent visible-light response, enabling the photocatalytic reduction of U(VI) to U(IV). The heterojunction formed between HAP and g-C 3 N 4 effectively suppresses electron-hole recombination, facilitating electron transfer and narrowing the band gap. Characterization revealed that the composite achieved a U(VI) removal efficiency of 99.28 % and a maximum adsorption capacity of 4880.95 mg/g, 1.85 times higher than single-component systems. Under solar light, photogenerated electrons in g-C 3 N 4 reduce U(VI) via interaction with dissolved oxygen to form superoxide radicals (· O 2 − ). This synergistic mechanism enhances photocatalytic performance and adsorption efficiency. The material exhibited excellent stability over multiple cycles, demonstrating its practical potential for environmental remediation. This study highlights the g-C 3 N 4 /HAP composite as a promising solar-driven material for efficient U(VI) removal, providing a sustainable and effective solution for uranium-contaminated water treatment.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2018
·Vol. 316
·期 1
·71-80
·
IF 1.181
Chen Huai,Chen Quan Shui,Huang Bin,Wang Shi Wei,Wang Ling Yu
In this work, a brand new organic superficial active sorbent l -Cysteine hydrochloride modified bentonite (LCMB) has been developed and proposed for treatment of contaminated water containing uranium. Correlation between different factors such as pH, contact time, temperature, initial concentration of U(VI) and efficiency of LCMB for uranium absorption are discussed. At uranium content in water from 25 to 250 mg L −1 , the sorption capacity for LCMB reached 208.3 mg g −1 that is essentially higher in comparison with other sorbents and notably improved from 77 mg g −1 after modification.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Weiqian Cai,Youqun Wang,Linshan Xiong,Yingjie Zheng,Zhibin Zhang,Xiaohong Cao,Yunhai Liu
Cuprous oxide (Cu 2 O), a promising semiconductor material, has been less employed in the photocatalytic removal of uranium. In this work, silver and gold nanoparticles were introduced on the surface of Cu 2 O. HR-TEM, XRD and XPS were applied in characterized the physic-chemical properties of composite. In comparison to Cu 2 O, Au modified Cu 2 O (Au/Cu 2 O-N) demonstrated a significantly enhanced uranium removal rate, reaching 100% within 120 minutes. This represents a 2-fold increase in the uranium removal rate compared to pure Cu 2 O-N. The reason con be interpreted including the red-shift of the absorption band from 600nm-800nm, the formation of Schottky junction between Au and Cu 2 O, the electron traps constructed by Au itself. Consequently, the rate of photogenerated electron-hole complexation is significantly diminished. Free trapping and EPR prove that reactive radicals are O 2 - . This has led to the development of a novel approach, namely the synergistic strategy of noble metal loading and nitrogen-doped cuprous oxide, which has the potential to facilitate the visible light removal of U(VI) from toxic wastewater.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xiangcheng Shan,Xiao Yang,Fuyu Liu,Xiaoyu Zhang,Jiazhe Chen,Dehao Liu,Qingzhe Zhang,Runzeng Liu,Yongguang Yin,Yong Cai
The photocatalytic reduction of highly toxic and soluble U(VI) to low toxic and insoluble U(IV) represents an environmentally friendly and efficient approach for uranium extraction. However, the application of photocatalytic U(VI) reduction is limited by low efficiency and challenges in recovering powder catalysts. In this study, we develop magnetically recyclable photocatalysts by integrating Fe 3 O 4 particles with in-situ grown ZnIn 2 S 4 /CdS Z -scheme heterojunctions (FO@ZIS/CS). Without adding any sacrificial agents, about 100 % of U(VI) in 50-mL aqueous solution (20 mg/L) is reduced by FO@ZIS/CS within 30-min visible light irradiation, which is 2.8 times higher than that of pristine ZnIn 2 S 4 (36 %). The remarkable performance is attributed to the Z -scheme heterojunction formed between ZnIn 2 S 4 and CdS, which promotes charge separation and preserves strong redox capabilities. Comprehensive experiments and theoretical simulations reveal that S and In atoms on ZnIn 2 S 4 (110) facets act as the active species for the U(VI) adsorption and reduction. Moreover, the FO@ZIS/CS photocatalyst maintains high U(VI) reduction efficiency in complex water matrices. The used FO@ZIS/CS and the adsorbed U(IV) can be easily recovered by an external magnetic field. This work offers a practical strategy for reducing and extracting U(VI) from mining wastewater, achieving both environmental remediation and resource recycling objectives.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2024
·Vol. 333
·期 3
·1343-1356
·
IF 1.5
Bi Dongxu,Cai Weiqian,Xiong Lingshan,Luo Qie,Wang Youqun,Zhang Zhibin,Xu Lin,Cao Xiaohong,Liu Yunhai
Three types of magnetic mesoporous silicas (MMSs), namely, MMCM-41, MMCM-48 and MSBA-15 were prepared by a hydrothermal method using CTAB and P123 as templates. The structure and physicochemical properties of MMSs were characterized by small angle XRD, VSM, ζ potential analyzer, contact angle measurer, and XPS, etc. The potential applications of MMSs in U(VI) recovery were thoroughly investigated. The adsorptive kinetics, thermodynamics, and selectivity of MMCM-41, MMCM-48 and MSBA-15 were compared. The results show that MSBA-15 revealed a high capacity for U(VI) (341.94 mg·g −1 ) and a superior selectivity than MMCM-41 and MMCM-48. The adsorption mechanism was explored by using the relevant adsorption models and XPS. The results indicated that MSBA-15 could be considered a strong candidate for the adsorption and recovery of U(VI) from radioactive wastewater.
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JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Siyu He,Wanrong Hu,Yali Liu,Yi Xie,Hui Zhou,Xuqian Wang,Jing Chen,Yongkui Zhang
Uranium in groundwater during uranium mining activities urgently needs to be remediated through effective and environmental-friendly approaches. The reduction and immobilization of soluble U(VI) using biogenic carboxymethyl cellulose modified iron sulfide complex (biogenic CMC-FeS complex) is one of the emerging and innovative methods. However, its removal mechanism is largely unknown. Here, biogenic CMC-FeS complex with extracellular polymeric substances (EPS) and CMC was successfully synthesized by sulfate-reducing bacteria (SRB) and showed highly dispersible capacity. The tryptophan and tyrosine, which were the main components in EPS produced by SRB on CMC-FeS surface, significantly increased the U(VI) removal capacity of the biogenic CMC-FeS complex compared with chemically synthesized CMC-FeS. U(VI) removal was attributed to the adsorption of soluble U(VI) by ≡ FeO + , CMC, tryptophan, and tyrosine on the biogenic CMC-FeS complex, following its reduction by S 2- , S 2 2- and Fe 2+ . Moreover, biogenic CMC-FeS complex with CMC-to-FeS molar ratio of 0.0005 performed well in the presence of bicarbonate (5 mM), humic acid (10 mg/L), or co-existing cations such as Pb 2+ , Ni 2+ , Cd 2+ , Mn 2+, and Cu 2+ (200 ug/L) at pH 7.0, and displayed relatively high oxidation resistance and stability ability. This work provides an in-depth understanding of the biogenic CMC-FeS complex for the U(VI) removal and contributes to the development of cost-effective U(VI) remediation technologies .
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Environmental Science-Nano
·
2017
·Vol. 4
·期 9
·1876-1886
·
IF 6.047
Yawen Cai,Chunfang Wu,Zhiyong Liu,Linjuan Zhang,Lanhua Chen,Jianqiang Wang,Xiangke Wang,Shitong Yang,Shuao Wang
Uranium is not only a strategic resource for nuclear power but also a highly toxic contaminant in the environment. Although a series of traditional capturing materials including zeolites, metal–organic frameworks, mesoporous silica, and carbon-based nanomaterials have been investigated and developed, the combined advantages of decent stability, ultrafast removal kinetics, high sorption capacity, great selectivity, and potential recyclability have yet to be integrated into a single material. Herein, a new synthesis strategy was developed to synthesize a novel phosphorylated graphene oxide (GO)–chitosan (CS) composite (denoted as GO–CS–P) for U(VI) removal. The crosslinking of GO with CS and the subsequent phosphorylation of the GO–CS composite were demonstrated by scanning electron microscopy (SEM), powder X-ray diffraction (PXRD), Fourier transform infrared spectroscopy (FTIR), zeta potential measurement, thermogravimetric (TG) analysis, and scanning transmission electron microscopy (STEM). Batch experiments and spectroscopic analysis were performed to explore the removal performance and mechanism of GO–CS–P towards U(VI). The results showed that the uptake of U(VI) was ultrafast as the sorption equilibrium could be reached within 15 min. The maximum sorption capacity of U(VI) at pH 5.0 and 293 K was calculated to be 779.44 mg g−1, one of the highest values among the currently reported adsorbents. GO–CS–P also exhibited an excellent selectivity for capturing U(VI) from a mixture containing multiple competing metal ions. According to the desorption experiments, FTIR, X-ray absorption spectroscopy (XAS) and X-ray photoelectron spectroscopy (XPS) analysis, the highly efficient immobilization of U(VI) in GO–CS–P was predominantly controlled by inner-sphere surface complexation with a minor contribution of surface reduction. The experimental findings demonstrated the feasibility of using GO–CS–P for used nuclear fuel partition and uranium-bearing wastewater remediation.
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DESALINATION
·
2026
·
IF 9.9
Zhouxiao Zhai,Jingce Bi,Linshan Wang,Ningning Liu,Yi Wang,Xia Zhang,Zhuopeng Wang,Yide Han
A g-C 3 N 4 /Bi 2 MoO 6 /Bi 2 WO 6 ternary heterojunction was constructed via simple mechanical grinding and thermal treatment. • GBMW follows a dual Z -scheme charge-transfer pathway, preserving strong redox capability for enhanced photocatalysis. • U(VI) acts as an electron acceptor to promote charge separation and improve photocatalytic performance. Due to the difficulty of conventional photocatalytic systems in simultaneously achieving strong oxidation and reduction processes, the treatment of wastewater containing coexisting uranium and organic pollutants remains a critical challenge in the field of photocatalysis. Herein, a novel g-C 3 N 4 /Bi 2 MoO 6 /Bi 2 WO 6 (GBMW) ternary photocatalyst with a dual Z -scheme heterojunction architecture was rationally constructed for the removal of U(VI) and tetracycline (TC) under visible-light irradiation. The dual Z-scheme heterojunction extends the visible-light response range and accelerates interfacial charge transfer, while preserving strong redox potentials. Within 100 min, GBMW achieves a U(VI) reduction efficiency of 91.6% and a TC degradation efficiency of 97.6%, with corresponding k obs values of 0.02332 and 0.03664 min −1 , respectively, which are significantly superior to those of BiMO, BiWO, GCN and GBW. Notably, U(VI) can act as an efficient electron acceptor to promote the separation of electrons and holes in GBMW, which significantly facilitates the degradation of TC. Moreover, GBMW demonstrates excellent stability and anti-interference performance in various real water matrices. This work not only provides a feasible strategy for constructing high-efficiency dual Z -scheme heterojunctions photocatalysts, but also offers an effective solution for treating complex wastewater containing coexisting organic pollutants and radioactive contaminants. Download: Download high-res image (264KB) Download: Download full-size image
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Yong Zhang,Siqi Huang,Bingyu Mei,Xiaoyu Tian,Lingyi Jia,Wenkun Zhu
Polydopamine/polyethyleneimine-grafted fly ash composite (PDA/PEI/FA), an efficient multifunctional adsorbent for U(VI) with excellent separation efficiency (94.5 %) and capacity (422.5 mg/g), was synthesized by grafting PDA and PEI on FA via Mussel inspiration and Michael addition reaction. The introduction of PDA and PEI had brought numerous functional groups with fine affinities to uranium, like catechol, amino and imino, causing good U(VI) separation performances. Langmuir and Pseudo-second-order models were well matched with experimental data, illustrating the U(VI) separation on PDA/PEI/FA was a homogeneous chemical adsorption process. After five cycles, the U(VI) adsorption efficiency for PDA/PEI/FA was still up to 90.2 %, implying that PDA/PEI/FA possessed good stability and reusability. Besides, the good dynamic adsorption performances of PDA/PEI/FA further demonstrated that PDA/PEI/FA was an ideal adsorbent for the practical wastewater treatment. According to the characterization results, U(VI) was absorbed by PAD/PEI/FA through complexation, redox reaction, electrostatic attraction and hydrogen bonding. Given the above, PDA/PEI/FA showed good practical application prospect in U(VI) separation.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Hao Lei,Ning Pan,Hao Zou,Xiaoqiang Wang,Xianguo Tuo
Efficient removing uranium (U(VI)) from highly acidic environment remain a great challenge for the adsorbent. Herein, a novel hollow phytic acid-based hybrid material (P(Cr)E-7) was synthesized by a mild facile one-pot self-assembly method without template choosing Cr 3+ , phytic acid (PA) and ethylenediamine (EDA) as the inorganic and two organic building blocks. P(Cr)E-7 was employed for U(VI) capture in highly acidic wastewater. Thanks to the flexible segment assembled from EDA and PA, and the strong affinity of PA to U(VI), the maximum adsorption capacity of P(Cr)E-7 for U(VI) reached 282.8 mg/g under the condition of pH = 1.0 in static adsorption experiment. Simultaneously, P(Cr)E-7 showed the selectivity efficiency of almost 100 % for An-Ln and pH-dependent selectivity efficiency of 60 % for U(VI) in multi-ions solution with pH = 1.0. Moreover, P(Cr)E-7 showed excellent stability in 0.1 M HNO 3 and reusability after three cycles at pH = 1.0 benefiting from stable segment from coordination of Cr(III) and PA. Additionally, the SEM, XRD , FTIR, and XPS analysis revealed the adsorption mechanism that U(VI) exchanges with positively charged EDA + /EDA 2+ in P(Cr)E-7 to obtain preferred coordination geometry and ligand environment and further coordinates with P-OH/P = O in PA. This study addresses the practical application of effective adsorption of uranium in highly acidic nuclear industrial wastewater and illustrated a novel material design strategy of adsorbents for uranium extraction.
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