Issue 32, 2015

Photocatalytic degradation of imidacloprid in soil: application of response surface methodology for the optimization of parameters

Abstract

The photocatalytic mineralization of imidacloprid (IMI) in soil to inorganic ions and the formation of various intermediates using TiO2 as the photocatalyst have been investigated under UV light. Various parameters, viz., catalyst concentration, soil depth and pH, intensity of light and initial concentration of IMI were optimized theoretically by using a central composite design based on a response surface methodology and were correlated with experimental results. The statistical analysis from the modelling results indicates that the degradation efficiency of IMI is affected by the depth of soil and the intensity of light, but the effects of the pH and the initial concentration of imidacloprid are more dominant. The optimum conditions obtained for the maximum degradation of imidacloprid were at pH = 3, intensity of UV light = 30 W m−2, soil depth = 0.2 cm and initial concentration of imidacloprid = 10 mg kg−1 of soil. Under these optimum conditions, the highest degradation efficiency of 83% was achieved after 18 h of UV light irradiation. The identification of various photoproduced intermediates of IMI by LC-MS analysis revealed its degradation, whereas the increase in the formation of inorganic ions with time of UV light irradiation confirms its mineralization.

Graphical abstract: Photocatalytic degradation of imidacloprid in soil: application of response surface methodology for the optimization of parameters

Supplementary files

Article information

Article type
Paper
Submitted
04 Feb 2015
Accepted
25 Feb 2015
First published
25 Feb 2015

RSC Adv., 2015,5, 25059-25065

Author version available

Photocatalytic degradation of imidacloprid in soil: application of response surface methodology for the optimization of parameters

T. Sharma, A. P. Toor and A. Rajor, RSC Adv., 2015, 5, 25059 DOI: 10.1039/C5RA02224J

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