Abstract
AbstractAn amphoteric hydrogel was prepared by cross-linking graft copolymerization of dimethyldiallylammonium chloride and acrylic acid onto soluble starch. The adsorption behaviors of ammonium nitrogen (-N) by the amphoteric hydrogel were discussed in this study. The effects of various experimental parameters on -N removal, including pH, the dose of absorbent, the temperature, the adsorption time, and the initial concentration of -N, were investigated. The result indicated that the amphoteric hydrogel showed a fast adsorption rate and high adsorption capacity for -N in a pH range from 4 to 8. The adsorption process was exothermic according to the value of thermodynamic parameters. The adsorption process fits the pseudo-second-order kinetic model best. To this hydrogel, it was seen that the Freundlich adsorption isotherm model fits the adsorption data better. The adsorption capacity could reach to 33.98 mg/g. The hydrogel showed the potential use for removal of -N in water treatment and fishing industry.
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