Isotherm adsorption studies of Cd (ii) ion removal from aqueous solutions by modified rubber- based adsorbent

Abstract

This work is dedicated to adsorption study of Cd (II) ions by 1-[1-Methyl-2-(methylamino) ethyl] thiourea modified synthetic rubber. The impact of pH, contact time, initial metal ion concentration were among the several parameters influencing the adsorption process that was studied throughout the research. The highest adsorption capacity was achieved with 593.47 mg/g at pH=3 after modification with new thiourea derivative. Five adsorption isotherm models were examined to explain the adsorption process, and it was found that results are in agreement with the Redlich–Peterson Isotherm. The Temkin model was examined and found that there is chemical adsorption occurs in the adsorbent-adsorbate system. Desorption study are also included in this paper to study regeneration property of the adsorbent. So, 0.5 mol/l H3PO4 has demonstrated the maximum desorption capability over Cd (II) ions. Keywords: adsorption, Cd (II), modification, isotherm, modification, thiourea.