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

[1] Narrow-band irradiation of a homologous series of chlorophenols on TiO2:: Charge-transfer complex formation and reactivity [J].

Agrios, AG ;

Gray, KA ;

Weitz, E .

LANGMUIR, 2004, 20 (14) :5911-5917

[2] Photocatalytic transformation of 2,4,5-trichlorophenol on TiO2 under sub-band-gap illumination [J].

Agrios, AG ;

Gray, KA ;

Weitz, E .

LANGMUIR, 2003, 19 (04) :1402-1409

[3] ELECTRON-SPIN-RESONANCE STUDIES OF ACTIVE SURFACE TITANIUM IONS ON ANCHORED TI-OXIDE CATALYSTS [J].

ANPO, M ;

SHIMA, T ;

FUJII, T ;

SUZUKI, S ;

CHE, M .

CHEMISTRY LETTERS, 1987, (10) :1997-2000

[4] An EPR study of thermally and photochemically generated oxygen radicals on hydrated and dehydrated titania surfaces [J].

Attwood, AL ;

Murphy, DM ;

Edwards, JL ;

Egerton, TA ;

Harrison, RW .

RESEARCH ON CHEMICAL INTERMEDIATES, 2003, 29 (05) :449-465

[5] Effect of rutile phase on the photocatalytic properties of nanocrystalline titania during the degradation of p-coumaric acid [J].

Bacsa, RR ;

Kiwi, J .

APPLIED CATALYSIS B-ENVIRONMENTAL, 1998, 16 (01) :19-29

[6] Photo-electrochemical hydrogen generation from water using solar energy. Materials-related aspects [J].

Bak, T ;

Nowotny, J ;

Rekas, M ;

Sorrell, CC .

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 2002, 27 (10) :991-1022

[7] Nanoparticles in the environment [J].

Banfield, JF ;

Zhang, HZ .

NANOPARTICLES AND THE ENVIRONMENT, 2001, 44 :1-58

[8] Mechanism of charge recombination in dye-sensitized nanocrystalline semiconductors: Random flight model [J].

Barzykin, AV ;

Tachiya, M .

JOURNAL OF PHYSICAL CHEMISTRY B, 2002, 106 (17) :4356-4363

[9] Pyridine-TiO2 surface interaction as a probe for surface active centers analysis [J].

Bezrodna, T ;

Puchkovska, G ;

Shimanovska, V ;

Chashechnikova, I ;

Khalyavka, T ;

Baran, J .

APPLIED SURFACE SCIENCE, 2003, 214 (1-4) :222-231

[10] A STRUCTURAL INVESTIGATION OF TITANIUM-DIOXIDE PHOTOCATALYSTS [J].

BICKLEY, RI ;

GONZALEZCARRENO, T ;

LEES, JS ;

PALMISANO, L ;

TILLEY, RJD .

JOURNAL OF SOLID STATE CHEMISTRY, 1991, 92 (01) :178-190

← 1 2 3 4 5 6 7 8 9 10 →