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Comparative study of visible-light-driven photocatalytic mechanisms of dye decolorization and bacterial disinfection by B–Ni-codoped TiO2 microspheres: The role of different reactive species

Paper ID Volume ID Publish Year Pages File Format Full-Text
46773 46448 2011 9 PDF Available
Title
Comparative study of visible-light-driven photocatalytic mechanisms of dye decolorization and bacterial disinfection by B–Ni-codoped TiO2 microspheres: The role of different reactive species
Abstract

The controversy of mechanism still exists over whether photocatalytic decontamination proceeds via photon-generated h+, e−, OH, O2− or H2O2. This study aims to investigate the roles of these reactive charges and oxidative species in the photocatalytic dye decolorization and bacterial disinfection processes in the presence of a visible-light-driven (VLD) photocatalyst, B–Ni-codoped TiO2 microsphere, by employing various scavengers in the photocatalytic system and utilizing a novel partition system. Significant differences between VLD photocatalytic dye decolorization and bacterial disinfection are found. For photocatalytic dye decolorization, the reaction mainly occurs on the photocatalyst surface with the aid of surface-bounded reactive species (h+, OHs and O2−), while bacterial cell can be inactivated by diffusing reactive oxidative species such as OHb and H2O2 without the direct contact with the photocatalyst. The diffusing H2O2 plays the most important role in the photocatalytic disinfection, which can be produced both by the coupling of OHb in bulk solution and OHs on the surface of photocatalyst at the valence band. Furthermore, the O2−, which is detected by using the electron spin resonance technique, is found to have direct function for the photocatalytic disinfection process. This study establishes a facile and versatile research methodology to investigate the VLD photocatalytic mechanism in different photocatalytic system.

Graphical abstractFor photocatalytic decolorization of dye, the reaction mainly occurs on the catalyst surface with the aid of surface-bounded reactive species (h+, OHs and O2−), while bacteria can be long-range inactivated without the direct contact with the photocatalysts.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Bacterial disinfection does not require direct contact with BNT catalyst, while dye decolorization requires. ► H2O2 plays the major role in bacterial disinfection. ► Coupling of both OHb and OHs produces H2O2 in the valence band. ► O2− directly involves bacterial disinfection. ► A versatile research strategy is developed to study the photocatalytic mechanisms.

Keywords
Photocatalysis; Dye decolorization; Bacterial disinfection; Partition system; Hydrogen peroxide
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Comparative study of visible-light-driven photocatalytic mechanisms of dye decolorization and bacterial disinfection by B–Ni-codoped TiO2 microspheres: The role of different reactive species
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 108–109, 11 October 2011, Pages 108–116
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us