Removal of cationic dyes by poly(acrylamide-co-acrylic acid) hydrogels in aqueous solutions

• Published in: Radiation physics and chemistry (Oxford, England : 1993) Vol. 77; no. 4; pp. 447 - 452
• Main Authors: Şolpan, Dilek, Duran, Sibel, Torun, Murat
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.04.2008
• Subjects: Adsorption; Cationic dyes; Diffusion; Gamma-irradiation; Hydrogel; Poly(acrylamide-co-acrylic acid); Swelling; Gamma-irradiation; Poly(acrylamide-co-acrylic acid); Swelling; Adsorption; Hydrogel; Diffusion; Cationic dyes
• ISSN: 0969-806X; 1879-0895
• DOI: 10.1016/j.radphyschem.2007.08.006

Poly(acrylamide-co-acrylic acid (poly(AAm-co-AAc)) hydrogels prepared by irradiating with γ-radiation were used in experiments on swelling, diffusion, and uptake of some cationic dyes such as Safranine-O (SO) and Magenta (M). Poly(AAm-co-AAc) hydrogels irradiated at 8.0 kGy have been used for swelling and diffusion studies in water and cationic dye solutions. The maximum swellings in water, and SO, and M solutions observed are 2700%, 3500%, and 4000%, respectively. Diffusions of water and cationic dyes within hydrogels have been found to be non-Fickian in character. Adsorption of the cationic dyes onto poly(AAm-co-AAc) hydrogels is studied by the batch adsorption technique. The adsorption type was found Langmuir type in the Giles classification system. The moles of adsorbed dye for SO and M per repeating unit in hydrogel (binding ratio, r) have been calculated as 3834×10 −6 and 1323×10 −6, respectively. These results show that poly(AAm-co-AAc) hydrogels can be used as adsorbent for water pollutants such as cationic dyes.