A New Composite Sorbent for Water and Dye Uptake:Highly Swollen Acrylamide/2-Acrylamido-2-Methyl-1-Propanesulfonic Acid/Clay Hydrogels Crosslinked by 1,4-Butanediol Dimethacrylate

摘要

A novel type of highly swollen hydrogels based on ac-rylamide(AAm)with 2-acrylamido-2-methyl-1-propane-sulfonic acid(AMPS)and clay such as bentonite(Bent)crosslinked by 1,4-butanediol dimethacrylate(BDMA)was prepared by free radical solution polymerization in aqueous media.Water uptake and dye sorption properties of polyelectrolyte AAm/AMPS hydrogels and AAm/AMPS/Bent composite hydrogels were investigated as a function of composition to find materials with swelling and sorption properties.FTIR analyses were made.Swelling experiments were performed in water and dye solution at 25°C,gravimetrically.Highly swollen AAm/AMPS and AAm/AMPS/Bent hydrogels were used in experiments on sorption of water-soluble monovalent cationic dye such as Lauths violet"LV,(Thionin)."Swelling of AAm/AMPS hydrogels was increased up to 1,920-9,222% in water and 867-4,644% in LV solutions,while AAm hydrogels swelled 905% in water and swelling of AAm/AMPS/Bent hydrogels was increased up to 2,756-10,422% in water and 1,200-3,332% in LV solutions,while AAm/Bent hydrogels swelled 849% in water.Some swelling kinetic and diffusional parameters were found.Water and LV diffusion into hydrogels was found to be non-Fickian in character.For sorption of cationic dye,LV into AAm/AMPS and AAm/AMPS/Bent hydrogel was studied by batch sorption technique at 25°C.The amount of the dye sorbed per unit mass removal effiency and partition coefficient of the hydrogels was investigated.The influence of AMPS content in the hydrogels to sorption was examined.