Cited by 278Advanced Photocatalysis TechniquesAdvanced oxidation water treatmentTiO2 Photocatalysis and Solar Cells

Enhanced Photocatalytic Removal of Sodium Pentachlorophenate with Self-Doped Bi2WO6 under Visible Light by Generating More Superoxide Ions

Ding, Xing, Zhao, Kun, Zhang, Lizhi·2014·Environmental Science & Technology

Abstract

In this study, we demonstrate that the photocatalytic sodium pentachlorophenate removal efficiency of Bi2WO6 under visible light can be greatly enhanced by bismuth self-doping through a simple soft-chemical method. Density functional theory calculations and systematical characterization results revealed that bismuth self-doping did not change the redox power of photogenerated carriers but promoted the separation and transfer of photogenerated electron-hole pairs of Bi2WO6 to produce more superoxide ions, which were confirmed by photocurrent generation and electron spin resonance spectra as well as superoxide ion measurement results. We employed gas chromatography-mass spectrometry and total organic carbon analysis to probe the degradation and the mineralization processes. It was found that more superoxide ions promoted the dechlorination process to favor the subsequent benzene ring cleavage and the final mineralization of sodium pentachlorophenate during bismuth self-doped Bi2WO6 photocatalysis by producing easily decomposable quinone intermediates. This study provides new insight into the effects of photogenerated reactive species on the degradation of sodium pentachlorophenate and also sheds light on the design of highly efficient visible-light-driven photocatalysts for chlorophenol pollutant removal.

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Crossref · 10.1021/es405714q

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  • O2•− can also be photogenerated by Bi 2+ x WO 6 (x = 0, 0.05, 0.1, 0.15 and 0.2) under visible light irradiation with autodoping.

    “O2•− can also be photogenerated by Bi 2+ x WO 6 (x = 0, 0.05, 0.1, 0.15 and 0.2) under visible light irradiation with autodoping [50].”

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Authors
Ding, X., Zhao, K., & Zhang, L.
Affiliations
Central China Normal University (CN)
Corresponding author
Zhang, Lizhi
Venue
Environmental Science & Technology
Published
2014-05-08
Volume
48
Issue
10
Pages
5823-5831
ISSN
  • 0013-936X (ISSN-L)
  • 1520-5851
OpenAlex
W2335530206
Cited by
278
References
34
Citations by year
2026: 14 · 2025: 10 · 2024: 19 · 2023: 16 · 2022: 38 · 2021: 30 · 2020: 24 · 2019: 26 · 2018: 28 · 2017: 20 · 2016: 25 · 2015: 21 · 2014: 7
FWCI
8.02
Type
journal article
Language
en
Open access
closed
Locations
  • Environmental Science & Technology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Advanced Photocatalysis Techniques
  • Physical Sciences › Environmental Science › Water Science and Technology › Advanced oxidation water treatment
  • Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › TiO2 Photocatalysis and Solar Cells
Keywords
sodium pentachlorophenate, Bi2WO6, visible light photocatalysis, superoxide, photogenerated electron-hole separation, chlorophenol degradation, dechlorination, mineralization, quinone intermediates
MeSH terms
Bismuth, Catalysis, Chromatography, Gas, Ions, Kinetics, Light, Oxidation-Reduction, Pentachlorophenol, Superoxides, Crystallography, X-Ray, Photoelectron Spectroscopy

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