REMOVAL OF RHODAMINE 6G DYE FROM AQUEOUS SOLUTION WITH COMPOSITE- SORBENT, OBTAINED FROM ALT-MALEIC ANHYDRIDE-STYRENE COPOLYMER AND ETHYLENE GLYCOL

This paper presents the results of the removal of Rhodamine 6G dye from water solutions by means of a composite-sorbent, obtained from alt-maleic anhydride-styrene copolymer and ethylene glycol. The amount of sorbent, effect of contact time, initial concentration of the dye and temperature on the sorption degree and sorption capacity was investigated. The experimental results were analyzed using the Langmuir and Dubinin-Radushkevich isotherms. The equilibrium sorption capacity (31.95 mg/g) was determined using the Langmuir equation. The adsorption energy calculated using the Dubinin-Radushkevich equation (ED=4.556 kJ/mol) indicates that the sorption is of a physical nature. The kinetic and thermodynamic parameters of sorption were determined. The sorption process is described by a pseudo- second reaction order, a positive value triangle H degrees (+12.464kJ/mol) indicates that sorption is endothermic in nature and a positive value triangle S o (+ 0.0271 kJ/mol<middle dot>K), shows increase randomness in adsorption process. The analysis of the result UV-Vis (SPECORD 210 PLUS (Germany))analysis of the result shows that the sorbent used in the sorption process has an absorption maximum at 530.5 nm, which is typical for Rh6G.The association of the cationic dye with the active centres (negatively charged carboxylate ions) of sorbent suggests that Rh6G has been bounded by electrostatic interaction forces. The SEM (model JEOL JSM-7600F (Japan) scanning electron microscope) shows the inhomogeneous surface of the sorbent after sorption due to the absorption of the dye on the sorbent surface