Effect of pH on the Adsorption of Crystal Violet Dye onto Carrageenan-Alginate Nanocomposite Hydrogels

The nanocomposite hydrogels based on kappa-carrageenan (Car) and sodium alginate (Na-Alg) biopolymers were synthesized from solution polymerization of acrylamide (AAm) monomer and methylenebisacrylamide (MBA) crosslinker using sodium montmorillonite (Na-MMt) nanoclay. The obtained nanocomposites were used to remove the cationic crystal violet dye from water. The effects of Carra and Na-Alg weight ration as well as the Na-MMt content on the dye adsorption capacity of nanocomposites were evaluated. In compared to hydrogel with no-clay, the results showed that the inclusion of Na-MMt nano-clay into hydrogels caused an increase in dye adsorption of hydrogels. Also, the increase in Carra to Na-Alg ration caused an increase in dye adsorption capacity.