𝔖 Bobbio Scriptorium
✦   LIBER   ✦

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

✍ Scribed by Alexandre G.S. Prado; Claudio Airoldi

Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
124 KB
Volume
236
Category
Article
ISSN
0021-9797

No coin nor oath required. For personal study only.

✦ Synopsis

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, (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. Copyright 2001 Academic Press.

πŸ“œ SIMILAR VOLUMES

Photocatalytic degradation of diuron [3-
Photocatalytic degradation of diuron [3-(3,4-dichlorophenyl)-1,1-dimethylurea] on the layer of TiO2 particles in the batch mode plate film reactor
✍ Hana KrΓ½sovΓ‘; Josef KrΓ½sa; KateΕ™ina MacounovΓ‘; JaromΓ­r JirkovskΓ½ πŸ“‚ Article πŸ“… 1998 πŸ› Wiley (John Wiley & Sons) 🌐 English βš– 358 KB πŸ‘ 1 views

The photocatalytic degradation of diuron in aqueous solution on TiO 2 layer of a batch mode plate reactor irradiated with ultraviolet sun-bed tubes was investigated. Dependence of the reaction rate on the diuron concentration (in the range of 0Γ‰8È8Γ‰0 ] 10~5 mol dm~3) and on the light intensity (0Γ‰8È

Study of Copper Complexes Absorbed on a
Study of Copper Complexes Absorbed on a Silica Gel Surface Chemically Modified with 5-Amino-1,3,4-thiadiazole-2-thiol
✍ Newton L. Dias Filho πŸ“‚ Article πŸ“… 1998 πŸ› Elsevier Science 🌐 English βš– 157 KB

The isotherms of adsorption of CuX2 (X = Cl-, Br-, ClO-4) by silica gel chemically modified with 5-amino-1,3,4-thiadiazole-2-thiol were studied in acetone and ethanol solutions, at 25 degreesC. The following equilibria constants (in L mol-1) were determined: (a) CuCl2, 3.2 x 10(3) (ac), 2.5 x 10(3)