Photocatalytic oxidation of pirimicarb in aqueous slurries containing binary and ternary oxides of zinc and titanium

被引：38

作者：

Fenoll, Jose ^{[1
]}

Garrido, Isabel ^{[1
]}

Heilin, Pilar ^{[1
]}

Flores, Pilar ^{[1
]}

Vela, Nuria ^{[2
]}

Navarro, Simon ^{[3
]}

机构：

[1] Inst Murciano Invest & Desarrollo Agrario & Alime, Dept Calidad & Garantia Alimentaria, Murcia 30150, Spain

[2] Univ Catolica San Antonio de Murcia, Fac Enfermeria, Murcia 30107, Spain

[3] Univ Murcia, Fac Quim, Dept Quim Agricola Geol & Edafol, E-30100 Murcia, Spain

来源：

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY | 2015年 / 298卷

关键词：

Pirimicarb; Transformation products; Photocatalytic Oxidation; Semiconductor materials; LEACHING WATER; VISIBLE-LIGHT; AZO-DYE; DEGRADATION; PHOTODEGRADATION; TIO2; PESTICIDES; ZNO; TRANSFORMATION; NANOPARTICLES;

D O I：

10.1016/j.jphotochem.2014.10.014

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 pirimicarb in pure water has been studied using zinc oxide (ZnO), titanium dioxide (TiO2) and zinc titanates (Zn2TiO4 and ZnTiO3) under artificial light (300-460 nm) irradiation. Comparison of catalysts showed that TiO2 is the most efficient for the removal of pirimicarb and their transformation products. To obtain a better understanding of the mechanistic details of these ZnO-TiO2-assisted photodegradation of pirimicarb, the transformation products of the processes were identified by liquid chromatography tandem mass spectrometry (LC-MS2) and liquid chromatography time of flight mass spectrometry (LC-TOF/MS) techniques. The probable photodegradation pathways are proposed and discussed. The main steps involved: N-dealkylation of the 2-dimethylamino group to form the carbamate and decarbamoylation of the carbamate moiety with further N-dealkylation of the 2-dimethylamino group to have the hydroxypyrimidines. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：24 / 32

页数：9

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