CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Qi Yang,Chang-Wei Bai,Yi-Jiao Sun,Yu-Jie Liu,Kun-Jie Hou,Fei Chen
Heterogeneous iron materials show potential for activating peroxydisulfate (PDS). However, these systems may be constrained by low efficiency and secondary pollution. The visible-light-assisted activation has been demonstrated as a feasible and effective approach to enhance PDS activation by iron-based materials. In this study, a visible-light-responsive Bi 2 WO 6 /Fe 2 O 3 heterojunction photocatalyst was synthesized to improve the ability of Fe 2 O 3 for PDS activation through an effective Fe(III)/Fe(II) cycle. Rapid tetracycline (TC, a common antibiotic) removal (91.7% within 60 min at a concentration of 20 mg·L -1 ) was achieved in the constructed Bi 2 WO 6 /Fe 2 O 3 /PDS/ vis system under conditions of 0.3 g·L -1 PDS and 0.3 g·L -1 catalyst. The corresponding pseudo-first-order rate constant reached 4.16 × 10 -2 min - 1 , which was 8.42 and 16.38 times higher than those of Bi 2 WO 6 /Fe 2 O 3 / vis and Bi 2 WO 6 /Fe 2 O 3 /PDS systems, respectively. Moreover, the Bi 2 WO 6 /Fe 2 O 3 exhibited favorable stability and reusability even after five cycles. Lastly, a catalytic mechanism for TC removal and PDS activation was proposed based on quenching experiments and electron spin resonance (ESR) tests. The SO 4 • - and • OH played a major role in TC removal, while • O 2 – and 1 O 2 contributed as auxiliary factors. This study presents a promising strategy for activating PDS using cost-effective and stable Fe(III)-based heterojunctions, and such an idea can be used to design catalysts for other high-value reactions.
研究领域:
环境科学
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材料科学
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化学工程
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DOI
高影响因子
MICROCHEMICAL JOURNAL
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2024
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IF 4.9
Nana Tang,Shuting Shi,Chuanqin Zhou,Jianhua Ding,Aiting Chen,Quanguo He,Wu Wang
The misuse of the antibiotic ampicillin (AMP) has led to the presence of antibiotic residues in related products, which enter the human body through the ecological or food chain to produce a variety of toxic side effects. There is an urgent need to develop enzyme-based assays with higher specificity to determine antibiotic residues in food. Hereby, bismuth tungstate (Bi 2 WO 6 ) was synthesized using a simple hydrothermal and calcination process. Carboxylated multi-walled carbon nanotubes (MWCNTs-COOH) were mixed with Bi 2 WO 6 by ultrasonication to form composite as modifier on glassy carbon electrode (GCE) surface. Meanwhile, metal β-lactamases (MBLs) were mixed with chitosan to be immobilized on it to obtain the MBLs/CS/Bi 2 WO 6 /MWCNTs-COOH/GCE. Under the optimal conditions, differential pulse voltammetry (DPV) was used for the quantitative detection of AMP. The experimental results showed that the peak currents were linearly correlated with the concentrations of AMP (0.0007–0.05 μM) and (0.1–10 µM) (R 2 = 0.9965 and 0.9956), and the detection limit was 0.17 nM (S/N = 3). The method has good repeatability, reproducibility, stability and immunity to interference, and can be applied to the highly sensitive detection of AMP in real samples with recoveries of 92.4–96.8 % and 94.3–103.0 %.
研究领域:
生物传感
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电化学分析
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食品检测
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DOI
高影响因子
CHEMOSPHERE
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2020
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IF 5.778
Peng-Yue Zhu,Xu Han,Xiang-Ming Wang,Yong Liu,Song-Hai Wu,Shi-Jie Wang,Zhi Xu,Shao-Yi Jia,Hai-Tao Ren
Conversion of aniline wastes to value-added products is always a promising method to treat aniline wastewater. In this study, a selective oxidation of aniline contaminants by Bi 2·15 WO 6 was carried out under visible light and alkaline conditions. Kinetic results show that the oxidation rates of aniline increase with increasing pH values under visible light. UV–vis absorption spectra and GC-MS analysis confirm that azobenzene is the primary oxidation product with aminophenol and N , N ′-diphenylhydrazine as the secondary products. The analyses from Mott-Schottky, electrochemical impedance spectroscopy (EIS), transient photocurrent and photoluminescence (PL) further indicate that OH − promotes the separation and transfer of photogenerated electron-hole pairs on the surface of Bi 2·15 WO 6 , thus facilitating oxidation of aniline. Quenching experiments and electron spin resonance (ESR) analysis confirm that h + is the predominant specie in the Bi 2·15 WO 6 system and aniline radical cation (PhNH 2 •+ ) is an important intermediate. The Hammett and ΔBDE N-H plots further reveal that e - abstraction from aniline with the formation of PhNH 2 •+ , followed by H + abstraction from PhNH 2 •+ with the formation of anilino radicals (PhNH • ), is the prerequisite for the formation of N , N ′-diphenylhydrazine, which is then oxidized to azobenzene via the hydrogen-abstraction pathway. This work provides a cost-effective method to selectively oxidize aniline to azobenzene.
研究领域:
环境科学
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光催化材料
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DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Yanyan Zhao,Xuhua Liang,Xiaoyun Hu,Jun Fan
Fabrication of binary composite has proved to be an efficient approach to improve the photocatalytic activity of monomer photocatalyst . In this contribution, an effective Reduced Graphene Oxide/Bismuth Tungsten Oxide (rGO/Bi 2 WO 6 ) composite with outstanding photocatalytic activity was designed by employing Bi 2 WO 6 as a primary photocatalyst and rGO as an electron acceptor and transporter for norfloxacin degradation in aquatic environment. The rGO/Bi 2 WO 6 composite displayed higher photocatalytic activity compare with pure Bi 2 WO 6 , which could degrade about 87.49% of norfloxacin with 180 min under visible light irradiation. The results of the UV–vis diffuse reflection spectrum, photoluminescence spectra and transient photocurrent response implied that the enhanced photocatalytic activity of the rGO/Bi 2 WO 6 composite could be attributed to the improved visible light-harvesting ability and the efficient charge separation ability. Additionally, the reactive-species-trapping experiments indicated that ⋅OH and e − played dominant roles during the photocatalytic degradation process. Four possible intermediates and two possible transformation pathways of norfloxacin degradation were detected by LC-MS. This present work provided a low-cost and facile green method to design of Bi-based composite.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
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2021
·Vol. 37
·期 3
·419-427
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IF 1.307
Guo Xiaofei,Qin Chuanxiang,Huang Sihui,Zhu Mingyue,Wang Jian-jun,Sun Jun,Dai Lixing
A composite photocatalyst, with branch-like BiOI/Bi 2 WO 6 heterojunction deposited on the polyacrylonitrile micro/nano composite fiber(PAN MNCF), was prepared via two step hydrothermal method. The products are characterized by X-ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS), photoluminescence(PL) spectra, UV-Vis diffuse reflection spectroscopy(UV-Vis DRS) and time-resolved fluorescence spectra. The PAN/BiOI/Bi 2 WO 6 micro/nano composite fiber(PAN/BiOI/Bi 2 WO 6 MNCF) showed better visible-light photocatalytic performance than PAN MNCF or BiOI/Bi 2 WO 6 powder, probably ascribed to the collective effect between PAN MNCF and BiOI/Bi 2 WO 6 heterojunction. Significantly, the PAN/BiOI/Bi 2 WO6 MNCF could be easily recycled through filtration method, thus avoiding the secondary pollution.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2026
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IF 12.5
JiCheng Liu,ZhaoYang Yao,Shun Gao,Xue Zou
BiOI/Bi 2 WO 6 /MXene composite was successfully synthesized via a solvothermal method, confirmed by XPS/XRD. • Optimal composite degraded 89.3% ranitidine and mineralized 56.0% in 2 h. • EPR analysis indicated that superoxide radicals (•O₂ − ) dominate the degradation process. Ranitidine, a widely used acid-suppressing drug, can undergo nitrosation in aquatic environments to generate N -nitrosodimethylamine (NDMA), a potent carcinogen that poses a serious threat to aquatic ecosystems. To address its persistence against natural degradation, a ternary BiOI/Bi₂WO₆/MXene composite was fabricated via a one-pot solvothermal synthesis. Heterojunction construction effectively broadened its visible-light harvesting capacity. Characterizations by SEM, TEM, XRD, and UV–Vis DRS confirmed the successful formation of the heterojunction with markedly enhanced visible-light absorption. Combined with band structure analysis and radical trapping experiments, a Z -scheme charge transfer mechanism was proposed. Visible-light photocatalytic tests showed that the optimal sample exhibits a high degradation efficiency of 89.3% for RAN, with a 47% relative enhancement compared with pristine BiOI. Radical identification revealed that superoxide radicals (·O₂ − ) were the dominant reactive species. The synergistic effect between the electron-conductive MXene and the interfacial heterojunction accelerated photogenerated carrier separation and ·O₂ − production. Moreover, the composite retained 72.35% of its degradation efficiency after three cycles, demonstrating good stability. This work provides a novel material design strategy for visible-light-driven ranitidine degradation and offers a theoretical basis for mitigating NDMA formation risks.
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DOI
高影响因子
Journal of Environmental Chemical Engineering
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2026
·Vol. 14
·期 3
·122571
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IF 7.5
Fei Meng,Muhammad Haris Khan,Shafqat Ali,Zareen Zuhra,Dugang Chen,Zhaowei Zhang
The environmental persistence and potential toxicity of microplastics have raised serious concerns regarding their impacts on aquatic ecosystems and human health. Herein, a Z-scheme heterojunction photocatalyst, MIL-53-NH 2 (Fe)/Bi 2 WO 6 , was rationally constructed to promote directional charge separation and enhance redox reactivity under light irradiation. Interfacial coupling between MIL-53-NH 2 (Fe)/Bi 2 WO 6 facilitates an efficient Z-scheme charge-transfer pathway, preserving the strong oxidation ability of photogenerated holes on Bi 2 WO 6 and the high reduction potential of electrons on MIL-53-NH 2 (Fe). When coupled with peroxymonosulfate (PMS), the heterojunction effectively activates PMS via electron-mediated pathways, leading to the generation of reactive oxygen species (ROS), primarily sulphate radicals (SO 4 •⁻ ), accompanied by the generation of hydroxyl radicals ( • OH) and superoxide radicals( • O 2 ⁻ ). As a result, polystyrene (PS) microplastics undergo accelerated oxidative chain scission, surface oxidation, and mass loss, achieving a weight reduction of 45.36% in the presence of 5 mM PMS. Radical quenching experiments and electron paramagnetic resonance (EPR) spectroscopy collectively confirm the dominant role of PMS-derived ROS and validate the proposed Z-scheme-driven degradation mechanism. This study elucidates the synergistic interplay between heterojunction charge dynamics and PMS activation, offering mechanistic insights into the design of efficient photocatalytic systems for microplastic degradation in aquatic environments.
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高影响因子
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