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Photocatalytic degradation of profenofos using silver-platinum doped zeolite
Catalysis Today ( IF 5.3 ) Pub Date : 2019-12-17 , DOI: 10.1016/j.cattod.2019.12.024
Fatin Samara , Fares Feghaly , Sofian Kanan

Organophosphate insecticides are persistent organic pollutants that have a variety of adverse impacts in several environmental compartments. The photo-degradation of organophosphate profenofos was researched in the presence and absence of silver-platinum-doped zeolite in (Ag-Pt-Zeolite) upon irradiation with ultraviolet light at wavelengths of 302 and 254 nm. Photo-degradation of profenofos at 302 nm and in the presence of Ag-Pt-Zeolite was 73 % complete in 60 min. GC/MS analysis indicated the formation of two major photo-degradation products upon irradiation with 302 nm in the presence of the catalyst. Moreover, four products were identified for the irradiation with 254 nm in the presence of the catalyst and for the uncatalyzed irradiated profenofos samples. The toxicity of the degradation products was assessed by exposure experiments using Drosophila melanogaster. These experiments showed that degradation resulted in overall less toxic products within the first 30 min of degradation, followed by an overall increase in toxicity after 30 min of UV exposure. The present work provides a treatment technique for the adequate removal of profenofos from water sources in order to mitigate its detrimental effects on the environment.



中文翻译:

银铂掺杂沸石光催化降解丙溴磷

有机磷杀虫剂是持久性有机污染物,对多个环境区域具有多种不利影响。在 (Ag-Pt-Zeolite) 中存在和不存在银-铂掺杂沸石的情况下,在波长为 302 和 254 nm 的紫外光照射下,研究了有机磷酸酯异丙磷的光降解。在 302 nm 和存在 Ag-Pt-沸石的情况下,profenofos 的光降解在 60 分钟内完成了 73%。GC/MS 分析表明在催化剂存在下用 302 nm 照射时会形成两种主要的光降解产物。此外,在催化剂存在下用 254 nm 照射和未催化照射的丙溴磷样品鉴定了四种产物。降解产物的毒性通过暴露实验使用黑腹果蝇。这些实验表明,降解导致在降解的前 30 分钟内产生总体毒性较低的产物,随后在暴露于紫外线 30 分钟后毒性总体增加。目前的工作提供了一种处理技术,用于从水源中充分去除丙溴磷,以减轻其对环境的不利影响。

更新日期:2019-12-17
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