在紫外光和可见光照射下，金/二氧化钛核壳纳米催化剂上乙醛高效完全氧化为二氧化碳。

Efficient complete oxidation of acetaldehyde into CO2 over Au/TiO2 core-shell nano catalyst under UV and visible light irradiation.

作者信息

Song Haiyan, Yu Yeon-Tea, Norby Poul

机构信息

Department of Chemistry and Centre for Materials Science and Nanotechnology, University of Oslo, PO Box 1033, Blindern, N-0315 Oslo, Norway,

出版信息

J Nanosci Nanotechnol. 2009 Oct;9(10):5891-7. doi: 10.1166/jnn.2009.1263.

DOI:10.1166/jnn.2009.1263

PMID:19908471

Abstract

Photocatalytic degradation of acetaldehyde and its photocatalytic mechanisms over Au/TiO2 core-shell nano catalyst were, for the first time, investigated under UV and visible light irradiation. The results indicate that Au/TiO2 core-shell catalyst shows higher activity for the oxidation of acetaldehyde into CO2 under both UV and visible light irradiation comparing with P-25 and metal-deposited TiO2 photocatalysts. When Au/TiO2 core-shell catalyst is excited by UV light, the Au-core acts as the sink to restore the separated electrons, thus to improve the photoinduced charge separation; while under visible light irradiation, the mechanism can be understood as the coordinate effect of the plasmon resonance of Au-core particles and the formation of an impurity energy level induced by TiO(2-x)F(x).

摘要

首次研究了在紫外光和可见光照射下，金/二氧化钛核壳纳米催化剂对乙醛的光催化降解及其光催化机理。结果表明，与P-25和金属负载的二氧化钛光催化剂相比，金/二氧化钛核壳催化剂在紫外光和可见光照射下对乙醛氧化为二氧化碳均表现出更高的活性。当金/二氧化钛核壳催化剂被紫外光激发时，金核作为电子受体来恢复分离的电子，从而改善光生电荷分离；而在可见光照射下，其机理可理解为金核颗粒的等离子体共振与TiO(2-x)F(x)诱导形成的杂质能级的协同效应。