Thermodynamic of adsorption of indium on strong acidic cationic exchange fiber

Adsorption of In3+ from aqueous solution by strong acid cationic exchange fiber(SACEF) was studied using batch experiments.Langmuir,Dubinin-Radushkevich(D-R),Freundlich,Temkin,Redlich-Peterson(R-P)and Koble-Corrigan(K-C) models were applied to analyze the adsorption equilibrium data of In3+on SACEF obtained with researching range of concentration at 293 323 K through linear fitting and nonlinear fitting methods.The results show that,except for Langmuir nonlinear fitting and Dubini-Radushkevieh models,the adsorption equilibrium data can be well interpreted by both the linear fitting and nonlinear fitting of the models with the R2values about 0.9.Out of all the models,Langmuir linear fitting model is the suitable model with highest linear fitting R2 value.The value of isosteric enthalpy indicates that the endothermic nature of the adsorption of In3+on SACEF.The adsorption of In3+on SACEF is an endothermic,spontaneous and entropy increase process with H0 and reasonable explanation is given to the adsorption behavior.