Sonophotocatalytic degradation of alazine and gesaprim commercial herbicides in TiO2 slurry

被引：48

作者：

Bahena, Cristina Lizama ^{[2
]}

Martinez, Susana Silva ^{[1
]}

Guzman, Daniel Morales ^{[3
]}

Trejo Hernandez, Ma. del Refugio ^{[3
]}

机构：

[1] Univ Autonoma Estado Morelos, Ctr Invest Ingn & Ciencias Aplicadas, Cuernavaca 62209, Morelos, Mexico

[2] Univ Autonoma Estado Morelos, FCQel CIICAp, Cuernavaca 62209, Morelos, Mexico

[3] Univ Autonoma Estado Morelos, Ctr Invest & Biotechnol, Cuernavaca 62209, Morelos, Mexico

来源：

CHEMOSPHERE | 2008年 / 71卷 / 05期

关键词：

alazine; gesaprim; herbicide; alachlor; atrazine; sonophotocatalysis;

D O I：

10.1016/j.chemosphere.2007.11.007

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The photocatalytic degradation of alazine and gesaprim commercial herbicides was carried out in aqueous TiO2 suspensions under UV light (15 W 352 nm). Degradation of these herbicides was also observed by the combined effects of photocatalysis with sonolysis (sonophotocatalysis) using an ultrasound source of 20 kHz. Degradation profiles were recorded by measuring the concentration of the active compounds present in the alazine (alachlor and atrazine) and gesaprim (atrazine) by HPLC as a function of irradiation time (sound and/or light). Over 90% of the active component in the gesaprim was abated and those in alazine were completely degraded. The content of total organic carbon and chemical oxygen demand was also monitored. Mineralization of the commercial herbicides was achieved. Over 80% of chemical oxygen demand abatement was attained for both herbicides with sonophotocatalysis at 150 min of irradiation time. The photocatalytic degradation of the herbicides followed a pseudo-first order kinetics and their rate constant was increased by the combined effects of sonolysis. (C) 2007 Elsevier Ltd. All rights reserved.

引用

页码：982 / 989

页数：8

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