TIO2-photocatalyzed degradation of phenol and ortho-substituted phenolic compounds

被引：203

作者：

Peiró, AM ^{[1
]}

Ayllón, JA ^{[1
]}

Peral, J ^{[1
]}

Doménech, X ^{[1
]}

机构：

[1] Univ Barcelona, Dept Quim, Barcelona 08193, Spain

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2001年 / 30卷 / 3-4期

关键词：

TiO2; photocatalysis; phenols;

D O I：

10.1016/S0926-3373(00)00248-4

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：

The photocatalytic degradation of phenol, guaiacol, 2-chlorophenol and catechol in aqueous suspensions of TiO2 under different experimental conditions has been investigated. The photodegradation of the different organics follows a Langmuir-Hinshelwood kinetics, showing rate constants that decrease in the order: guaiacol > 2-chlorophenol congruent to phenol > catechol. A similar trend is also observed, except for catechol, for the stability of the a-complexes that may be formed between the aromatic ring and the OH. radical. From different analytical techniques (HPLC, GC/MS and HPLC/MS), various hydroxylated intermediate compounds have been reported acid different mechanisms of degradation of the starting compounds have been proposed. From experiments performed using aqueous solutions containing the four organics, it is observed that the competitive Langmuir-Hinshelwood kinetics for the degradation of each one of the phenolic compounds is obeyed. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：359 / 373

页数：15

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