Title of Paper:Hierarchically macro-mesoporous ZrO2-TiO2 composites with enhanced photocatalytic activity

Hits:

Date of Publication:2015-05-01

Journal:CERAMICS INTERNATIONAL

Included Journals:SCIE、EI

Volume:41

Issue:4

Page Number:5749-5757

ISSN No.:0272-8842

Key Words:Macro-mesoporous structure; ZrO2-TiO2 composites; Surfactant self-assembly; Photocatalyst

Abstract:Hierarchically macro-mesoporous ZrO2-TiO2 composite materials were prepared based on a facile surfactant self-assembly method with titanium isopropoxide (TIP) and zirconium n-butoxide as precursors. The ZrO2 content in the composites (2.0-9.8%) was easily controlled by adjusting the molar ratio of the two precursors, while maintaining the porous structures of the materials. SEM results demonstrated that the ZrO2-TiO2 composites were featured by paralleled channels (50-500 nm) and interparticle pores (similar to 8 nm) in the walls. The photocatalytic activities of the novel composites were remarkably higher than corresponding pure macro-mesoporous TiO2 and ZrO2 materials in the decomposition of Rhodamine B (RhB) under UV light radiation. The ZrO2-TiO2 sample with 6.9% of ZrO2 was proved to be the most efficient catalyst with degradation kinetic constant twice larger than that of the pure macroporous TiO2. Trapping experiments indicated that photogenerated holes and radicals were all vital to the photocatalytic process under UV light irradiation. ESR measurements gave the direct evidence that the active radicals center dot OH and O-2(center dot-) were responsible for the photodecomposition of RhB. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.