Titanium dioxide mediated photocatalytic degradation of 3-amino-2-chloropyridine

被引：29

作者：

Abramovic, BF ^{[1
]}

Anderluh, VB ^{[1
]}

Topalov, AS ^{[1
]}

Gaál, FF ^{[1
]}

机构：

[1] Fac Sci Novi Sad, Dept Chem, YU-21000 Novi Sad, Serbia and Mont, Serbia

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2004年 / 48卷 / 03期

关键词：

photocatalytic degradation; titanium dioxide; 3-amino-2-chloropyridine; water treatment; photolysis;

D O I：

10.1016/j.apcatb.2003.10.007

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 kinetics of the photocatalytic degradation of 3-amino-2-chloropyridine, as a model compound for pyridine containing pesticides, in UV illuminated aqueous suspensions of TiO2 were investigated. It was found that mineralization to carbon dioxide, water, chloride, ammonia, and nitrate takes place during the process. The rate of degradation was studied by HPLC, ion chromatography and UV spectrometry, as well as by continuous potentiometric measurement of the rate of chloride generation and the pH change of the medium. It was found that the reaction in the investigated concentration range is of the zero-order in respect to 3-amino-2-chloropyridine degradation with the reaction rate constant 8.9 x 10(-6) mol/(dm(3) min) and adsorption coefficient 1.2 x 10(4) dm(3)/mol. HPLC analysis indicated that very few pyridine containing intermediates at low concentrations are formed during the process. Based on the obtained data a tentative reaction mechanism was proposed. Kinetics of the degradation were also monitored for direct photolysis, as well as for solar degradation in the presence and in the absence of TiO2. (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：213 / 221

页数：9

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