JOURNAL OF HAZARDOUS MATERIALS
·
2017
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IF 6.065
Yi Li,Yanan Li,Shuanglong Ma,Pengfei Wang,Qianlei Hou,Jingjing Han,Sihui Zhan
Ag 2 WO 4 /g-C 3 N 4 composite photocatalyst was synthesized by polymerization of thiourea and ammonia chloride combined with the deposition-precipitation method, which was applied as an efficient visible-light driven photocatalyst for inactivating Escherichia coli ( E. coli ). The physicochemical properties of these photocatalysts were systematically characterized by various techniques such as SEM, TEM, XRD, FT-IR, BET, UV–vis DRS and PL. The synthesized photocatalysts exhibited outstandingly enhanced photocatalytic disinfection efficiency compared with that of pure g-C 3 N 4 and Ag 2 WO 4 under visible light. Furthermore, the optimal mass ratio of the Ag 2 WO 4 to g-C 3 N 4 was 5 wt%, and a number of live bacteria could be completely inactivated with Ag 2 WO 4 (5%)/g-C 3 N 4 (100 μg/mL) after 90 min under visible light irradiation. The high disinfection efficiency is due to the synergetic effect between g-C 3 N 4 and Ag 2 WO 4 , including a good distribution of Ag 2 WO 4 particles on the surface of g-C 3 N 4 and an improved separation rate of photogenerated electron-hole pairs. The enhanced disinfection mechanism was also investigated using photogenerated current densities and electrochemical impedance spectroscopy (EIS). Considering the bulk availability and excellent disinfection activity of Ag 2 WO 4 /g-C 3 N 4 composite, it is a promising solar-driven photocatalyst for cleaning the microbial contaminated water.
研究领域:
环境科学
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材料科学
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光催化
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水处理
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纳米技术
✓ 已验证
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2020
·
IF 3.085
Yongping Cui,Yaru Shang,Ruixia Shi,Yingzi Wang,Yuanna Zhu,Ping Yang
A novel biphase silver tungstate (Ag 2 WO 4 )/tungstate oxide (WO 3 ) photocatalyst was synthesized through electrospinning process combined with a facile solid chemical reaction. The X-ray diffraction patterns , energy dispersive spectroscopy and Fourier transform infrared spectroscopy demonstrated that the photocatalyst is composed of monoclinic WO 3 , β-Ag 2 WO 4 and γ-Ag 2 WO 4 . The Ag 2 WO 4 /WO 3 can completely degrade the rhodamine B (RhB) within 20 min under 300 W xenon lamp . The first-order kinetics constant k of Ag 2 WO 4 /WO 3 is 26.3 times of WO 3 . The recycling photocatalytic tests proclaimed that the Ag 2 WO 4 /WO 3 is relatively stable. The composites possess smaller impedance and higher photocurrent intensity, which displayed the promoted photoelectrochemical activities. The broadened light harvesting and accelerated photogenerated charge carrier migration account well for the enhanced photocatalytic performance of the composite. The direct Z-scheme photocatalytic mechanism should be responsible for the boosted photocatalytic performances of biphase Ag 2 WO 4 /WO 3 . This work gave new insights into the design and construction of WO 3 -based direct Z-scheme photocatalysts.
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2025
·Vol. 60
·期 47
·24439-24453
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IF 3.9
Wang Yabo,Duan Xiaohui,Wei Yiguo,Du Gangfeng,Tian Zhengshan,Bai Suzhen,Pan Zihong,Bai Ruibing
An efficient Ag 2 WO 4 /BiFeO 3 heterojunction was successfully synthesized using a facile hydrothermal and in situ precipitation method. A comprehensive investigation was conducted into the morphological, structural, and optical properties of the Ag 2 WO 4 /BiFeO 3 heterojunction. The optimally synthesized Ag 2 WO 4 /BiFeO 3 heterojunction demonstrated an impressive removal efficiency toward Lanasol Red 5B (95.62%) within 100 min under simulated solar irradiation, which was 5.18-fold higher than pristine BiFeO 3 . The engineered heterojunction effectively optimized the electron transfer pathway, significantly enhancing the separation efficiency of photogenerated electrons and holes. A notable selectivity of the Ag₂WO₄/BiFeO₃ heterostructure was observed in the photocatalytic degradation of organic dyes under simulated solar irradiation. The removal efficiencies followed the order: Lanasol Red 5B (95.62%) > Congo red (50.47%) > Methyl red (47.16%) > Safranin T (22.22%) > Rhodamine B (8.07%) > Methyl orange (3.04%). Furthermore, active species trapping experiments confirmed that holes and superoxide radicals were the predominant reactive species driving the photocatalytic process. This simple synthesis method opens up new possibilities for developing efficient BiFeO 3 -based photocatalysts for environmental remediation purposes.
研究领域:
材料科学
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环境修复
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光催化
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纳米材料
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Bo Liu,Jiayi Feng,Tangzheng Lu,Xiang Zhang,Yong Kang
Novel flower-like Bi 2 O 2 CO 3 /Ag 2 WO 4 photocatalysts incorporating oxygen vacancies were successfully prepared by chemical precipitation method. A range of characterization techniques were employed to investigate the morphology features, structure characteristics and photocatalytic properties of the photocatalysts. The composite photocatalyst extends the absorbance edge to the visible region. And it has remarkable adsorption and photocatalytic properties. It efficiently degrades almost all methylene blue (MB) within 90 min under visible light irradiation. This degradation rate surpasses that of pure Bi 2 O 2 CO 3 by a factor of 5.2. The synergistic interaction between oxygen vacancies and heterojunctions effectively diminishes the excitation energy required for the composites, while simultaneously achieving a superior separation efficiency of photogenerated electrons and holes, thereby enhancing the photocatalytic performance. Additionally, the composite photocatalysts demonstrate excellent stability and recyclability, making them suitable for practical wastewater purification. Free radical trapping experiments showed that the primary reactive substances involved in MB degradation is positive hole (h + ). Based on the experimental findings, a plausible working mechanism for Bi 2 O 2 CO 3 /Ag 2 WO 4 heterojunction composite photocatalysts incorporating oxygen vacancies, belonging to the type II heterojunction system, was proposed. This study provides novel perspectives on the development of efficient bismuth-based photocatalysts harnessing the synergistic oxygen vacancies and heterojunctions. These photocatalysts demonstrate promising application prospects in the realm of environmental remediation.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2020
·
IF 5.289
Yaya Song,Wenyu Xie,Chao Yang,Dandi Wei,Xintai Su,Li Li,Lu Wang,Jide Wang
Herein, Ag/Ag 2 MoO 4 and Ag/Ag 2 WO 4 have been prepared via a humic acid-assisted precipitation-calcination process and used as catalysts for the hydrogenation reduction of nitro- and azo-aromatic compounds. The Ag/Ag 2 MoO 4 and Ag/Ag 2 WO 4 composites were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared (FTIR) and Raman spectroscopies, UV–vis-NIR diffuse reflectance spectroscopy (DRS), and nitrogen adsorption-desorption analyses. Metallic Ag nanoparticles were in situ generated during the annealing process and spatially confined in the Ag 2 MoO 4 or Ag 2 WO 4 matrix, which effectively inhabited the particle agglomeration of silver. The Ag/Ag 2 MoO 4 and Ag/Ag 2 WO 4 catalysts displayed good performance toward the hydrogenation reduction of 4-nitrophenol, 2-nitroaniline, and rhodamine B in terms of rapid conversion and long term durability.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）