Adsorption thermodynamics of carbofuran on Sn (IV) arsenosilicate in H+, Na+ and Ca2+ forms

Abstract The adsorption thermodynamics of carbofuran was studied on Sn (IV) arsenosilicate cation exchanger in the H+, Na+ and Ca2+ forms at 25 and 50°C. The adsorption isotherms of carbofuran were found to follow the Freundlich adsorption model and yield ‘S’ and ‘L’ class isotherms. The order of adsorption of carbofuran on the different forms of cation exchanger is H+ > Na+ > Ca2+. The thermodynamic equilibrium constant (K0), standard free energy (ΔG0), enthalphy (ΔH0) and entropy (ΔS0) changes were also been calculated to predict the nature of adsorption.