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

A route for 3-(3,4-dichlorophenyl)-1,1-dimethylurea (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 the precursor, giving...

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Bibliographic Details
Published in:Journal of colloid and interface science 2001-04, Vol.236 (1), p.161-165
Main Authors: Prado, Alexandre G.S., Airoldi, Claudio
Format: Article
Language:English
Subjects:
Chemistry
diuron
Exact sciences and technology
General and physical chemistry
immobilization
pesticide
silica
Solid-liquid interface
Surface physical chemistry
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Summary:A route for 3-(3,4-dichlorophenyl)-1,1-dimethylurea (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 the precursor, giving 1.03 mmol of amine per gram of silica. Infrared, 13C, and 29Si 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.
ISSN:0021-9797
1095-7103
DOI:10.1006/jcis.2000.7401