Photodegradation of neonicotinoid insecticides in water by semiconductor oxides

被引：55

作者：

Fenoll, Jose ^{[1
]}

Garrido, Isabel ^{[1
]}

Hellin, Pilar ^{[1
]}

Flores, Pilar ^{[1
]}

Navarro, Simon ^{[2
]}

机构：

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

[2] Univ Murcia, Fac Quim, Dept Quim Agr Geol & Edafol, E-30100 Murcia, Spain

来源：

ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH | 2015年 / 22卷 / 19期

关键词：

Water detoxification; Thiamethoxam; Imidacloprid; Acetamiprid; Photocatalytic oxidation; ZnO; TiO2; TANDEM MASS-SPECTROMETRY; ADVANCED OXIDATION PROCESSES; PHOTOCATALYTIC DEGRADATION; SENSITIZED PHOTODEGRADATION; TIO2; PHOTOCATALYSIS; NATURAL SUNLIGHT; PILOT-PLANT; AZO-DYE; PESTICIDES; CATALYST;

D O I：

10.1007/s11356-015-4721-2

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 three neonicotinoid insecticides (NIs), thiamethoxam (TH), imidacloprid (IM) and acetamiprid (AC), in pure water has been studied using zinc oxide (ZnO) and titanium dioxide (TiO2) as photocatalysts under natural sunlight and artificial light irradiation. Photocatalytic experiments showed that the addition of these chalcogenide oxides in tandem with the electron acceptor (Na2S2O8) strongly enhances the degradation rate of these compounds in comparison with those carried out with ZnO and TiO2 alone and photolytic tests. Comparison of catalysts showed that ZnO is the most efficient for the removal of such insecticides in optimal conditions and at constant volumetric rate of photon absorption. Thus, the complete disappearance of all the studied compounds was achieved after 10 and 30 min of artificial light irradiation, in the ZnO/Na2S2O8 and TiO2/Na2S2O8 systems, respectively. The highest degradation rate was noticed for IM, while the lowest rate constant was obtained for AC under artificial light irradiation. In addition, solar irradiation was more efficient compared to artificial light for the removal of these insecticides from water. The main photocatalytic intermediates detected during the degradation of NIs were identified.

引用

页码：15055 / 15066

页数：12

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