Preparation of Au/TiO2 nanocomposites and their catalytic activity for DPPH radical scavenging reaction

被引:44
作者
Isono, R
Yoshimura, T
Esumi, K
机构
[1] Tokyo Univ Sci, Dept Appl Chem, Shinjuku Ku, Tokyo 1628601, Japan
[2] Tokyo Univ Sci, Inst Colloid & Interface Sci, Shinjuku Ku, Tokyo 1628601, Japan
关键词
gold; TiO2; DPPH; dimethylamineborane; nanocomposites; UV photolysis; catalysis; radical scavenging reaction;
D O I
10.1016/j.jcis.2005.02.078
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Au/TiO2 nanocomposites have been prepared by UV photolysis or chemical reduction of a Au(III) complex formed on a spherical or a rodlike TiO2 support, and their catalytic activity for 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging reaction was investigated. The chemical reduction with dimethylamine borane (DMAB) provided smaller gold nanoparticles than those synthesized by UV photolysis. Type of the TiO2 also affected the size of gold particles; smaller gold particles were deposited on the spherical TiO2 support than on rodlike one. For the radical scavenging reaction, the Au/TiO2 nanocomposites prepared by chemical reduction exhibited a higher catalytic activity than those photochemically prepared, and rodlike TiO2 provided a higher activity than spherical one. The effects of preparation methods and type of TiO2 supports on the catalytic activity are discussed. (c) 2005 Elsevier Inc. All rights reserved.
引用
收藏
页码:177 / 183
页数:7
相关论文
共 38 条
[1]  
Akiyama S., 2005, J JPN SOC COLOUR MAT, V78, P112
[2]  
[Anonymous], GMELIN HDB INORGAN B
[3]   Novel one-step synthesis of amine-stabilized aqueous colloidal gold nanoparticles [J].
Aslam, M ;
Fu, L ;
Su, M ;
Vijayamohanan, K ;
Dravid, VP .
JOURNAL OF MATERIALS CHEMISTRY, 2004, 14 (12) :1795-1797
[4]   Structure and bonding of gold metal clusters, colloids, and nanowires studied by EXAFS, XANES, and WAXS [J].
Benfield, RE ;
Grandjean, D ;
Kröll, M ;
Pugin, R ;
Sawitowski, T ;
Schmid, G .
JOURNAL OF PHYSICAL CHEMISTRY B, 2001, 105 (10) :1961-1970
[5]   Gold: a relatively new catalyst [J].
Bond, GC .
CATALYSIS TODAY, 2002, 72 (1-2) :5-9
[6]   THE INFLUENCE OF PARTICLE-SIZE ON THE CATALYTIC PROPERTIES OF SUPPORTED METALS [J].
CHE, M ;
BENNETT, CO .
ADVANCES IN CATALYSIS, 1989, 36 :55-172
[7]   Vital role of moisture in the catalytic activity of supported gold nanoparticles [J].
Daté, M ;
Okumura, M ;
Tsubota, S ;
Haruta, M .
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 2004, 43 (16) :2129-2132
[8]   Antioxidant action by gold-PAMAM dendrimer nanocomposites [J].
Esumi, K ;
Houdatsu, H ;
Yoshimura, T .
LANGMUIR, 2004, 20 (07) :2536-2538
[9]  
ESUMI K, 2002, J JPN SOC COLOUR MAT, V75, P561
[10]  
ESUMI K, 2003, J JPN SOC COLOUR MAT, V76, P463