Study on the adsorption of crystal violet by starch-g-poly (acrylic acid)

摘要

By grafting polymerization, starch-g-poly(acrylic acid) (St-g-PAA) hydrogel was prepared and used to adsorb crystal violet (CV). The influences of adsorption time, pH values of the CV solution, adsorption temperature and the initial CV concentrations on the adsorption capacity were investigated. Meanwhile, adsorption isotherm and sorption thermodynamics were studied. The absorption experimental results showed that the prepared St-g-PAA was an effective adsorbent for removal of CV from aqueous solution. The adsorption capacity increased with the increasing of pH values of the dye solution, adsorption temperature and the initial CV concentrations. The adsorption of CV by St-g-PAA was Freundlich type. Moreover, the calculated thermodynamic parameters indicated the spontaneous and endothermic nature of the adsorption process. The values of activation energy demonstrated that the adsorption was mainly physical process.