Grafting of phenylarsonic and 2-nitrophenol-4-arsonic acid onto disordered silica obtained by selective leaching of brucite-like sheet from chrysotile structure |
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Authors: | Wypych Fernando Schreiner Wido H Richard Emerson |
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Institution: | 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 |
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Abstract: | 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. |
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