The pesticide 3-(3,4-dichlorophenyl)-1,1-dimethylurea (Diuron) immobilizedon silica gel surface

Citation
Ags. Prado et C. Airoldi, The pesticide 3-(3,4-dichlorophenyl)-1,1-dimethylurea (Diuron) immobilizedon silica gel surface, J COLL I SC, 236(1), 2001, pp. 161-165
Citations number
30
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
JOURNAL OF COLLOID AND INTERFACE SCIENCE
ISSN journal
00219797 → ACNP
Volume
236
Issue
1
Year of publication
2001
Pages
161 - 165
Database
ISI
SICI code
0021-9797(20010401)236:1<161:TP3(I>2.0.ZU;2-9
Abstract
A route for 3-(3,4-dichlorophenyl)-1,l-dimethylurea (diuron) immobilization on silica gel was established after reacting at the first stage the precur sor silylant agent 3-trimethoxysilylpropylamine to the support. The pestici de was covalently bonded to available amine groups of the precursor, giving 1.03 mmol of amine per gram of silica. Infrared, C-13, and Si-29 NMR spect ra are in agreement with the proposed reaction between nitrogen of the amin e 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 68.4 0% reaction yield, respectively; these results were confirmed through eleme ntal analysis. (C) zool Academic Press.