Rhodium Adsorption on Gallic Acid Resol Resin

M. Can Vocational School of Arifiye, 54580, Sakarya University, Turkey

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A new adsorbent resin has been developed by immobilizing gallic acid with formaldehyde, and its adsorption properties to Rh3+ were reviewed with respect to the collection in aqueous solution. Linear and nonlinear regression procedures have been applied to the Langmuir, Freundlich, Tempkin, Dubinin-Radushkevich, and Redlich-Peterson isotherms. The resin exhibited good adsorption capacity towards Rh3+ from acidic aqueous solutions ([H+]=1 M, [Cl-]=1 M). The equilibrium adsorption capacity at 293 K was up to 69.43 mg g-1. The adsorption isotherms could be well described by Langmiur equation. The experimental studies suggested that gallic acid formaldehyde resin was effective for the adsorption of Rh3+ from chloride acid solutions, and the loaded Rh3+ could be easily desorbed from the 1 M HNO3 + 0.1 M NaClO3 solution mixture with a hundred percent efficiency. Thermodynamic parameters such as the entropy change, enthalpy change and Gibbs free energy change were calculated. The adsorption of Rh3+ was found to be an endothermic adsorption process. This suggested that the resin can be used as an active biosorbent for the recovery of Rh3+ from 1 M HCl concentrated acid solution.

DOI: 10.12693/APhysPolA.127.1301 PACS numbers: 82.30.Hk