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Visible light-active sub-5 nm anatase TiO2 for photocatalytic organic pollutant degradation in water and air, and for bacterial disinfection

Paper ID Volume ID Publish Year Pages File Format Full-Text
49635 46757 2015 5 PDF Available
Title
Visible light-active sub-5 nm anatase TiO2 for photocatalytic organic pollutant degradation in water and air, and for bacterial disinfection
Abstract

•Controlled sol–gel synthesis of hydroxyl defect-laden sub-5 nm anatase TiO2•Clarification of the surface and sub-surface hydroxyl defects•Hydroxyl defects rendered the sub-5 nm anatase TiO2 visible light-active.•Effective visible-light-driven degradation of organic pollutants in water and in air•Effective photocatalytic bacterial disinfection under visible light irradiation

Visible-light-sensitive sub-5 nm anatase titanium dioxide (TiO2) nanoparticles (NPs) were fabricated without any doping and calcination treatments. The energy band gap was effectively narrowed to ~ 2.98 eV. The surface and subsurface hydroxyl defects were ascertained as the origin for the band gap narrowing and for the efficient azo-based dye degradation in water and formaldehyde decomposition in air, as well as disinfection of Staphylococcus aureus bacteria, under visible light irradiation.

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Keywords
Visible-light-responsive TiO2; Sub-5 nm particle size; Surface and subsurface defects; Hydroxyls; Energy band gap
First Page Preview
Visible light-active sub-5 nm anatase TiO2 for photocatalytic organic pollutant degradation in water and air, and for bacterial disinfection
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 72, 5 December 2015, Pages 81–85
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis