title: Silica-titania sol-gel hybrid materials: synthesis, characterization and potential application in solid phase extraction.
abstract: 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.
authors.affiliation: Laboratório de Sólidos e Superficies, Instituto de Quimica, UFRGS, Porto Alegre, RS, Brazil.
authors.forename: Sandra V M
authors.initials: SV
authors.lastname: de Moraes
authors.forename: Joana B
authors.initials: JB
authors.lastname: Passos
authors.forename: Patricia
authors.initials: P
authors.lastname: Schossler
authors.forename: Elina B
authors.initials: EB
authors.lastname: Caramão
authors.forename: Celso C
authors.initials: CC
authors.lastname: Moro
authors.forename: Tania M H
authors.initials: TM
authors.lastname: Costa
authors.forename: Edilson V
authors.initials: EV
authors.lastname: Benvenutti