Mixed-Phase TiO2 with Oxygen Vacancies for Enhanced Visible Light Photocatalysis Performance

Author:

Chen Xi1ORCID,Deng Tian-Song1,Zhou Ming1,Dong Zhihua1,Cheng Zhiqun1

Affiliation:

1. College of Electronics and Information Engineering, Hangzhou Dianzi University, Hangzhou 310018, P. R. China

Abstract

Because of the decrease in the band gap and the carrier recombination rate, the visible light photocatalysis performance of the mixed-phase TiO2 with oxygen vacancies is better than that of the pure-phase TiO2. In this study, two different acids were separately applied in the hydrothermal synthesis of TiO2 nanoparticles without any post-heat treatment. The reaction was carried out at a relatively low temperature not exceeding 140C. Both kinds of crystallized TiO2 powders show much more band gap reduction than that of commercial Degussa P25 TiO2 nanoparticles, which can be attributed to the oxygen vacancies. Under the visible light illumination-assisted photocatalytic degradation of methyl orange in water, the two mixed-phase TiO2 powders exhibited a steady photocatalytic activity upon increasing to five cycles. The highest photocatalytic efficiency of the two powders is 2.7 times than that of the P25 powder, which is regarded as an excellent photocatalyst for water purification.

Funder

National Natural Science Foundation of China

Key Technologies Research and Development Program

Natural Science Foundation of Zhejiang Province

Project of Ministry of Science and Technology

Publisher

World Scientific Pub Co Pte Ltd

Subject

Condensed Matter Physics,General Materials Science

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