Grafting of phenylarsonic and 2-nitrophenol-4-arsonic acid onto disordered silica obtained by selective leaching of brucite-like sheet from chrysotile structure.
The products of reaction of natural chrysotile fibers with phenylarsonic acid or 2-nitrophenol-4-arsonic acid are described. The new grafted layered materials with basal spacing of 15.5 and 17.0 A were characterized by powder X-ray diffraction, thermal analysis, X-ray photoelectron spectroscopy, and Fourier transform infrared spectroscopy. The experimental data are consistent with the grafting of phenylarsonate and 2-nitrophenol-4-arsonate groups onto the surface of the disordered silica, obtained by the in situ acidic leaching of the brucite-like sheets starting from the original chrysotile structure.
Wypych
Fernando
F
Centro de Pesquisas em Química Aplicada, CEPESQ, Departamento de Química, Universidade Federal do Paraná, UFPR, CP 19081, 81531-990 Curitiba, PR, Brazil. wypych@quimica.ufpr.br
Schreiner
Wido H
WH
Richard
Emerson
E