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Enhanced photocatalytic activity of hierarchically micro-/nano-porous TiO2 films

Paper ID Volume ID Publish Year Pages File Format Full-Text
48019 46488 2008 6 PDF Available
Title
Enhanced photocatalytic activity of hierarchically micro-/nano-porous TiO2 films
Abstract

Photocatalytic activity of hierarchically micro-/nano-porous film is studied for the first time. The results show its catalytic activity was increased ca. 30–40% and ca. 60–70% for mineralizing gaseous acetaldehyde and liquid-phase phenol, respectively, comparing to that of nano-structured film. Hierarchical TiO2 porous film produces continuously composite pore channels, providing the fast transport pathway for reactants, products and O2 moving into and out of the catalytic framework. Additionally, due to extended optical path length from light scattering effect in composite film, the light-absorption efficiency is enhanced distinctly in the range of 380–410 nm, which is close to P25 TiO2 band-gap edge. The presented investigation indicates that the pores structure plays important roles in the photocatalytic characters of films photocatalyst. More important, the as-prepared film catalyst gives a promising future for its actual application.

Keywords
TiO2; Hierarchical structure; Photocatalytic; Composite channels
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 83, Issues 1–2, 1 September 2008, Pages 24–29
Authors
, , , , , , , , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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