Removal of Rose Bengal Dye from Aqueous Solution using Low Cost (SA-g-PAAc) Hydrogel: Equilibrium and Kinetic Study

Abstract

Hydrogels are considered one of the most important polymers, with very low economic costs for treating dyes from an aqueous solution. In this study, sodium alginate (SA), a kind of polysaccharide, and acrylic acid is an organic compound, N’-Methylene-bis-acrylamide (MBA) as a cross-linked agent, were used to prepare the hydrogel by free radical method. Studies have shown that sodium lignite-based nano-hydrogel is environmentally friendly, more cost-effective and highly efficient in remove dye in aqueous solution. The hydrogel adsorption characteristic was analyzed via scanning electron microscope (SEM). The data appear that the surface contains many pores and has a sponge-like structure. also the results showed that the hydrogel is the XRD of (SA-g-PAAc) a wide band at 2θ = 20.52° within the calculated d = 4.21A°. Study isotherm adsorption the highest (R²=0.9903) related to the isotherm Freundlich and Kinetic model the adsorption process of Rose Bengal dye on the SA-g-PAAc hydrogel follows a second model.