Comparison of Ag deposition effects on the photocatalytic activity of nanoparticulate TiO2 under visible and UV light irradiation

被引：406

作者：

Sung-Suh, HM ^{[1
]}

Choi, JR ^{[1
]}

Hah, HJ ^{[1
]}

Koo, SM ^{[1
]}

Bae, YC ^{[1
]}

机构：

[1] Hanyang Univ, Dept Chem Engn, Coll Engn, Seoul 133791, South Korea

来源：

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY | 2004年 / 163卷 / 1-2期

关键词：

TiO2; Ag deposition; rhodamine B; charge separation; photodegradation; visible light;

D O I：

10.1016/S1010-6030(03)00428-3

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：

We investigated the photocatalytic degradation of rhodamine B (RB) dye in the aqueous suspensions of TiO2, (similar to17 nm) and Ag-deposited TiO2 nanoparticles under visible and UV light irradiation in order to evaluate and distinguish various effects of the Ag deposition on the TiO2 photocatalytic activity. The TiO2 and Ag-TiO2 photocatalysts were characterized by XRD, TEM, XPS, UV-visible absorption and photon correlation spectroscopy. For comparison, the RB photodegradation was carried out in Degussa P25 TiO2, and Ag-deposited P25 suspensions under the same condition. In the RB/Ag-TiO2 system, Ag deposits significantly enhanced the RB photodegradation under visible light irradiation whereas the RB photodegradation under UV irradiation was slightly enhanced. The significant enhancement in the Ag-TiO2 photoactivity under visible light irradiation can be ascribed to simultaneous effects of Ag deposits by both acting as electron traps and enhancing the RB adsorption on the Ag-TiO2 surface. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：37 / 44

页数：8

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