Open AccessA study of photocatalytic degradation of methomyl and its commercial product Lannate-90
Author(s) -
Anđelka Tomašević,
Аleksandar Marinković,
Dušan Ž. Mijin,
Marina Radišić,
Slavica Porobić,
Nevena Ž. Prlainović,
Slavica Gašić
Publication year - 2020
Publication title -
chemical industry and chemical engineering quarterly
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.189
H-Index - 26
eISSN - 2217-7434
pISSN - 1451-9372
DOI - 10.2298/ciceq190424002t
Subject(s) - methomyl , photodegradation , chemistry , degradation (telecommunications) , photocatalysis , pesticide degradation , high performance liquid chromatography , mass spectrometry , chromatography , nuclear chemistry , catalysis , pesticide , organic chemistry , telecommunications , computer science , agronomy , biology
Photocatalytic degradation of the carbamate insecticide methomyl and its commercial product Lannate-90 in aqueous suspension of TiO2 and ZnO using an Osram ultra-vitalux' lamp (315-400 nm) was investigated. The objective of the investigation was to study and compare the rates of photochemical degradation of the pure active compound and its formulated product in order to find out the impact of inert ingredients on degradation processes. The photochemical degradation of pure methomyl was found to be slower than the degradation of its commercial product Lannate-90. Photodegradation was investigated by UV-Vis spectrometry and HPLC, while mineralization was monitored using IC and TOC analyses. Light absorption capabilities of catalysts were characterized by ultraviolet-visible diffuse reflectance spectroscopy method, while the stability of catalysts was studied by infrared analyses. Degradation products of methomyl and its formulated product were identified by high-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) results and tentative photodegradation pathways were proposed.