REMOVAL OF RHODAMINE 6G DYE FROM WATER SOLUTION BY ALT-MALEIC ANHYDRIDE-STYRENE COPOLYMER, CROSS-LINKED WITH HEXAMETHYLENEDIAMINE

Abstract

The article provides data on the use of crosslinked with hexamethylenediamine alt-maleic anhydride-styrene copolymer, as a sorbent for the remove of the Rhodamine 6G dye from aqueous solution. The effect of the pH, sorbent amount, contact time, temperature and dye concentration on sorption was studied. The obtained data were processed in the coordinates of the Langmuir, Freundlich and D-R models equations and the values of the equilibrium sorption capacity and mean sorption energy were determined. The found value of the mean sorption energy from D–R equation ED=4.556<8.0 kJ mol–1 , indicated that the sorption of Rh6G by synthesized polymer-sorbent has physical character. Also, thermodynamic parameters, like standard Gibbs free energy (∆G˚), standart enthalpy change (∆H˚) and standart entropy change (∆S˚) were determined. The positive values of ΔG° confirm the nonspontaneous of adsorption process, and the positive value of ΔH° (12.464 kJ mol–1 ) suggested that the adsorption was endothermic in nature. The positive value of ΔS° (0.0271 kJ mol–1 K –1 ) shows the increasing randomness during adsorption process.