Probing reaction mechanisms in mixed phase TiO2 by EPR

被引：227

作者：

Hurum, DC

Agrios, AG

Crist, SE

Gray, KA

Rajh, T

Thurnauer, MC ^{[1
]}

机构：

[1] Northwestern Univ, Inst Environm Catalysis, Dept Civil & Environm Engn, Evanston, IL 60208 USA

[2] Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA

来源：

JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA | 2006年 / 150卷 / 2-3期

基金：

美国国家科学基金会;

关键词：

anatase; rutile; mixed phase TiO2; electron paramagnetic resonance (EPR); photocatalysis; interfacial charge transfer;

D O I：

10.1016/j.elspec.2005.01.294

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

Charge separation processes in mixed phase TiO2 photocatalysts are investigated by electron paramagnetic resonance (EPR) spectroscopy. The mechanisms of interfacial electron transfer, subsequent charge migration and recombination at surface sites, and other interfacial effects on chlorophenol/TiO2 chemistry have been probed. Distorted interfacial sites have been observed and are proposed as catalytically reactive hot spots. This detailed knowledge of charge transfer processes is critical to the nanoscate design of catalysts and subsequent improvement of catalytic efficiency. (c) 2005 Elsevier B.V. All rights reserved.

引用

收藏

页码：155 / 163

页数：9

相关论文

共 102 条

[41] ELECTRON-PARAMAGNETIC RESONANCE STUDY OF SLIGHTLY REDUCED RUTILE (TIO2) CRYSTALS [J].

KERSSEN, J ;

VOLGER, J .

PHYSICA, 1973, 69 (02) :535-561

[42] Generation of superoxide anion and most likely singlet oxygen in irradiated TiO2 nanoparticles modified by carotenoids [J].

Konovalova, TA ;

Lawrence, J ;

Kispert, LD .

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, 2004, 162 (01) :1-8

[43] Surface modification of TiO2 nanoparticles with carotenoids.: EPR study [J].

Konovalova, TA ;

Kispert, LD ;

Konovalov, VV .

JOURNAL OF PHYSICAL CHEMISTRY B, 1999, 103 (22) :4672-4677

[44] Photocatalytic transformation of pesticides in aqueous titanium dioxide suspensions using artificial and solar light: intermediates and degradation pathways [J].

Konstantinou, IK ;

Albanis, TA .

APPLIED CATALYSIS B-ENVIRONMENTAL, 2003, 42 (04) :319-335

[45] Evaluation of the energetics of electron trap states at the nanocrystalline titanium dioxide/aqueous solution interface via time-resolved photoacoustic spectroscopy [J].

Leytner, S ;

Hupp, JT .

CHEMICAL PHYSICS LETTERS, 2000, 330 (3-4) :231-236

[46] The synthesis and hydrolysis of dimethyl acetals catalyzed by sulfated metal oxides. An efficient method for protecting carbonyl groups [J].

Lin, CH ;

Lin, SD ;

Yang, YH ;

Lin, TP .

CATALYSIS LETTERS, 2001, 73 (2-4) :121-125

[47] PHOTOCATALYSIS ON TIO2 SURFACES - PRINCIPLES, MECHANISMS, AND SELECTED RESULTS [J].

LINSEBIGLER, AL ;

LU, GQ ;

YATES, JT .

CHEMICAL REVIEWS, 1995, 95 (03) :735-758

[48] ESR spin-trapping detection of radical intermediates in the TiO2-assisted photo-oxidation of sulforhodamine B under visible irradiation [J].

Liu, GM ;

Zhao, JC ;

Hidaka, H .

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, 2000, 133 (1-2) :83-88

[49] Photoassisted degradation of dye pollutants.: 8.: Irreversible degradation of alizarin red under visible light radiation in air-equilibrated aqueous TiO2 dispersions [J].

Liu, GM ;

Wu, TX ;

Zhao, JC ;

Hidaka, H ;

Serpone, N .

ENVIRONMENTAL SCIENCE & TECHNOLOGY, 1999, 33 (12) :2081-2087

[50] Angular overlap treatment and electron spin resonance of titanium(III) in anatase [J].

Meriaudeau, P. ;

Che, M. ;

Jorgensen, C. K. .

CHEMICAL PHYSICS LETTERS, 1970, 5 (03) :131-133

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