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

被引：408

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

共 43 条

[1] SEMICONDUCTOR-SENSITIZED PHOTODEGRADATION OF 4-CHLOROPHENOL IN WATER [J].

ALSAYYED, G ;

DOLIVEIRA, JC ;

PICHAT, P .

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, 1991, 58 (01) :99-114

[2]

[Anonymous], 1989, PHOTOCATALYSIS FUNDA

[3]

ANPO M, 1996, SURFACE PHOTOCHEMIST, P117

[4] PEPTIZATION PROCESS IN THE SOL-GEL PREPARATION OF POROUS ANATASE (TIO2) [J].

BISCHOFF, BL ;

ANDERSON, MA .

CHEMISTRY OF MATERIALS, 1995, 7 (10) :1772-1778

[5]

Briggs D., 1983, Practical Surface Analysis by Auger and X-ray Photoelectron Spectroscopy

[6] Visible light-induced reactions of humic acids on TiO2 [J].

Cho, YM ;

Choi, WY .

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, 2002, 148 (1-3) :129-135

[7] THE ROLE OF METAL-ION DOPANTS IN QUANTUM-SIZED TIO2 - CORRELATION BETWEEN PHOTOREACTIVITY AND CHARGE-CARRIER RECOMBINATION DYNAMICS [J].

CHOI, WY ;

TERMIN, A ;

HOFFMANN, MR .

JOURNAL OF PHYSICAL CHEMISTRY, 1994, 98 (51) :13669-13679

[8]

Disdier J., 1981, J CHEM SOC F1, P2815

[9] HETEROGENEOUS PHOTOCATALYSIS [J].

FOX, MA ;

DULAY, MT .

CHEMICAL REVIEWS, 1993, 93 (01) :341-357

[10]

Fujishima A., 2000, J PHOTOCH PHOTOBIO C, V1, P1, DOI DOI 10.1016/S1389-5567(00)00002-2

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