Heterogeneous photocatalysis of imidacloprid the effect of reaction parameters

The heterogeneous photocatalytic transformation of a harmful neonicotinoide insecticide, imidacloprid using TiO2 photocatalyst was the aim of the present work. The optimal TiO2 concentrations in oxygenated, aerated and oxygen-free suspensions were determined. However the dissolved oxygen enhanced th...

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Bibliographic Details
Main Authors: Hlogyik Tamás
Náfrádi Máté
Rampal Abhimanyu
Garg Seema
Hernádi Klára
Alapi Tünde
Ábrahám Imre
Corporate Author: International Symposium on Analytical and Environmental Problems (24.) (2018) (Szeged)
Format: Book part
Published: 2018
Series:Proceedings of the International Symposium on Analytical and Environmental Problems 24
Kulcsszavak:Fotokatalízis, Analitikai kémia
Online Access:http://acta.bibl.u-szeged.hu/56352
Description
Summary:The heterogeneous photocatalytic transformation of a harmful neonicotinoide insecticide, imidacloprid using TiO2 photocatalyst was the aim of the present work. The optimal TiO2 concentrations in oxygenated, aerated and oxygen-free suspensions were determined. However the dissolved oxygen enhanced the transformation rate of imidacloprid that was occurred in oxygen-free suspensions too. This can be explained by the relative high reactivity of imidacloprid towards hydrated electron, thus the relative contribution of direct charge can be significant. The effect of different additives was investigated to prove this assumption: NaF, methanol, t-butanol, chloroform, EDTA and KI. The pH and ionic strength of the solution have also significant effect, most likely by modifying the surface properties of TiO2. The results showed, that beside HO• based reaction the direct charge transfer must have significant role in the transformation of imidaclopride.
Physical Description:290-294
ISBN:978-963-306-623-2