Grafting of phenylarsonic and 2-nitrophenol-4-arsonic acid onto disordered silica obtained by selective leaching of brucite-like sheet from chrysotile structure

摘要

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 spcctroscopy,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.