Modification of bentonite with diphosphonium salts: Synthesis and characterization |
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Authors: | Benamar Makhoukhi Didier Villemin |
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Affiliation: | a Department of Chemistry, Catalysis Laboratory, Tlemcen University B.P119, 13000 Tlemcen, Algeria b LCMT, ENSICAEN, UMR 6507 CNRS, Université de Caen, 6 bd Ml Juin, 14050 Caen, France |
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Abstract: | Intercalations of diphosphonium salts (bis(triphenylphosphonium methylene) benzene-dichloride (TPhPMB) and bis(tributylphosphonium methylene) benzene-dichloride (TBuPMB)) into bentonite were carried out through the ion-exchange of a purified bentonite with a solution of diphosphonium salt. X-ray diffraction (XRD), 31P MAS NMR, thermogravimetric analysis (TGA) and Fourier transform infrared spectroscopy (FT-IR) were used to assess the effect of product exchange on bentonite surface and the exfoliation phenomenon of bentonite interlayer. Experimental results demonstrated that the purified bentonite has a basal spacing of 13.2 Å while the modified bentonites show a greater basal spacing of about 18 Å and has a good thermal stability (300-400 °C). |
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Keywords: | Bentonite Diphosphonium salts Intercalation Characterization methods |
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