Silica-titania sol-gel hybrid materials: synthesis, characterization and potential application in solid phase extraction.
The biphenilaminepropylsilica and biphenilaminepropylsilicatitania were synthesized by sol-gel method, in two steps: (a) biphenylamine reacts with chloropropyltrimethoxysilane and (b) the product of reaction was polycondensed with tetraethylorthosilicate (TEOS) or TEOS and titanium isopropoxide. The sol-gel materials were characterized using infrared spectroscopy and N(2) adsorption-desorption isotherms and they were employed as sorbents for carcinogenic N-containing compound retention, in aqueous solution, using the SPE technique. The N-containing compounds adsorption was influenced by the titania presence and the sorption process seems to happen in the pores with higher organic density.
de Moraes
Sandra V M
SV
Laboratório de Sólidos e Superficies, Instituto de Quimica, UFRGS, Porto Alegre, RS, Brazil.
Passos
Joana B
JB
Schossler
Patricia
P
Caramão
Elina B
EB
Moro
Celso C
CC
Costa
Tania M H
TM
Benvenutti
Edilson V
EV