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Steam-assisted synthesis of uniformly mesoporous anatase and its remarkably superior photocatalytic activities

Paper ID Volume ID Publish Year Pages File Format Full-Text
54377 47007 2015 7 PDF Available
Title
Steam-assisted synthesis of uniformly mesoporous anatase and its remarkably superior photocatalytic activities
Abstract

•Novel steam assisted highly crystalline ordered mesoporous anatase TiO2.•High surface area with uniformly distributed hexagonal large pores is reported.•Remarkably higher rate of H2 production from water under one sun light condition.•Superior photocatalytic dye degradation (MB and 4-CP) under low pressure Hg lamp.•The extended crystalline interconnection decreases the band gap energy by 0.22 eV.

The steam treatment of hexagonally ordered uniformly mesoporous (h-UM) amorphous TiO2 at 120 °C for 1 h leads to highly crystalline h-UM anatase. This process is feasible for the large scale (>50 g) preparation. The surface area-normalized photocatalytic activities of h-UM anatase for water reduction and methylene blue and 4-chlorophenol decompositions are remarkably superior to those of wormhole-like randomly mesoporous anatase and anatase nanoparticles, demonstrating an important reason to prepare anatase in UM forms. Due to the extended crystalline interconnection, the band gap energy h-UM anatase decreases by 0.22 eV with respect to that of 25 nm anatase nanoparticle.

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Keywords
Steam treatment; Large scale hexagonally ordered uniformly mesoporous anatase; Photocatalytic water reduction; 4-Chlorophenol and methylene blue decompositions
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Steam-assisted synthesis of uniformly mesoporous anatase and its remarkably superior photocatalytic activities
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 243, 1 April 2015, Pages 228–234
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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