The Pestidcide 3-(3,4-Dichlorophenyl)-1,1-dimethylurea(Diuron) Immobilized on Silica Gel Surface

摘要

Aroute for 3-(3,4-dichlorophenyl)-1,1-dimehtylurea (diuron) immobilization on silica gel was established after reacting at the first stage the precursor silylant agent 3-trimethoxysilylpropylamine to the support. The pesticide was covalently bonded to available amine groups of hte precursor, giving 1.03 mmol of amine per gram of silica. Infrared, ~(13)C, and ~(29)Si NMR spectra are in agreement with the proposed reaction between nitrogen of the amine group of the previously anchored silica to carbon on the para-position of the aromatic ring of the pesticide. The immobilization is clearly affected by the presence or absence of disprotonating agent, to give 12.50 and 68.40% reaction yield, respectively; these results were confirmed through elemental analysis.