Ammonium salt of the cross-linked maleic acid-allylpropionate-styrene terpolymer as effective sorbent for removal of Cu2+ ions from water solutions (sorption of the copper ions)

摘要

The capability of the ammonium salt of the cross-linked maleic acid-allylpropionate-styrene terpolymer for the adsorption of Cu2+ from aqueous solutions was examined. Effect of the various experimental parameters on removal degree of the copper ions was investigated. Equilibrium data were fitted to the Langmuir, Freundlich, Dubinin-Radushkevich, and Temkin isotherm models. Kinetics studies suggested that the adsorption allowed pseudo-second-order reaction. The negative values of G degrees and the positive value of H degrees indicate that the sorption process is spontaneous and endothermic in nature. The positive value of S degrees shows the increasing randomness during adsorption process. Considering the FTIR and UV-vis spectra of the sorbent after sorption, it is concluded that Cu2+ enters a complex with carboxylate and ester groups of the sorbent.