Photocatalytic degradation of bentazone in soil washing wastes containing alkylpolyoxyethylene surfactants

被引：33

作者：

Davezza, M. ^{[1
]}

Fabbri, D. ^{[1
]}

Pramauro, E. ^{[1
]}

Prevot, A. Bianco ^{[1
]}

机构：

[1] Univ Turin, Dipartimento Chim Analit, I-10125 Turin, Italy

来源：

CHEMOSPHERE | 2012年 / 86卷 / 04期

关键词：

Soil washing; Nonionic surfactants; Photocatalysis; Bentazone degradation; NONIONIC SURFACTANTS; TIO2; PHOTODEGRADATION; PRODUCTS;

D O I：

10.1016/j.chemosphere.2011.09.011

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Three alkylpolyoxyethylene surfactants bearing the same hydrophobic chain and a different number of oxyethylene groups were investigated as suitable candidates for the soil washing treatment of contaminated soil samples containing bentazone. Comparable good recoveries of the pesticide were obtained working with these surfactants. The photocatalytic treatment of the collected washing wastes, performed in the presence of suspended TiO2 particles under irradiation with simulated sunlight, leads to the effective degradation of bentazone residues after a time depending on the nature and concentration of the chosen amphiphile. Brij 35 was found to be the best surfactant candidate, giving the faster abatement of the pesticide in the collected wastes. The overall treatment time depends on the bentazone mineralization kinetics, markedly slow in the presence of surfactants. Useful information about the photocatalytic degradation route was obtained from the HPLC-MS analysis of transient intermediates formed in water. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：335 / 340

页数：6

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