Article ID Journal Published Year Pages File Type
5211023 Reactive and Functional Polymers 2008 16 Pages PDF
Abstract
Water uptake and the sorption properties of polyelectrolyte composite hydrogels made by the polymerization of acrylamide (AAm) with 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS) and a clay such as bentonite (Bent) were investigated as a function of composition to find materials with swelling and dye sorption properties. Highly swollen AAm/AMPS hydrogels and AAm/AMPS/Bent composite hydrogels were prepared by free radical solution polymerization in aqueous solutions of AAm with AMPS as comonomer and a multifunctional crosslinker such as ethylene glycol dimethacrylate (EGDMA). FT-IR analyses were made. Swelling experiments were performed in water and dye solution at 25 oC, 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, (Thionine)”. Swelling of AAm/AMPS hydrogels was increased up to 2282-12,603% in water and 921-3575% in LV solutions, while AAm hydrogels swelled 927% in water and swelling of AAm/AMPS/Bent hydrogels was increased up to 3225-15,421% in water and 1360-4189% in LV solutions, while AAm/Bent hydrogels swelled 828% 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 oC. AAm/AMPS and AAm/AMPS/Bent hydrogels in the dye solutions showed coloration. The amount of the dye sorbed per unit mass removal efficiency and partition coefficient of AAm/AMPS and AAm/AMPS/Bent hydrogels was investigated. The influence of AMPS content in hydrogels to sorption was examined.
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Physical Sciences and Engineering Chemistry Organic Chemistry
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