Poly(Acrylamide-Sepiolite)Composite Hydrogels:Preparation,Swelling and Dye Adsorption Properties

摘要

Polymer-clay hydrogel composite was prepared on the basis of polyacrylamide (PAAm)gel containing the clay mineral sepiolite.The properties of swelling and dye adsorption of poly(acrylamide-sepiolite)(AAm/Sep)composite hydrogel were investigated.The parameters of swelling and diffusion in water and dye solutions were calculated for the AAm and AAm/Sep hydrogels.It was found that the equilibrium swelling degree of obtained composite higher than that of AAm gel.Spectroscopic analysis of composite and composite-dye systems was done with FT-IR method.Adsorption of monovalent cationic dyes such as Basic Blue 12 (BB-12)Basic Blue 9 (BB-9),and Basic Violet 1 (BV-1),was studied on the composite.In the adsorption experiments,S (Sigmoidal)type for composite gel adsorption isotherms in the Giles classification system was found.Adsorption studies indicated that the amounts of adsorbed dyes on the AAm/Sep composite hydrogel were increased with following order;BB-12 >BB-9 >BV-1.The composite hydrogel may be considered as good candidate for environmental application to retain more water and dyes.