Kinetics of phosphate removal using surfactant modified clinoptilolite

Abstract

In this work, the preliminary results on the removal pathways for phosphate ions from aqueous solution using surfactant-modified clinoptilolite (SMC) were investigated. The chemical kinetic describes the time course of reaction pathways to reach the equilibrium, whereas chemical equilibrium gives no information about pathways and reaction rates. Langmuir and Freundlich isotherm constants and correlation coefficients for the present system were calculated and compared. The equilibrium process of phosphate removal was described well by the Langmuir isotherm. The sorption kinetic was tested for Elovich, pseudo-first order and pseudo-second order reaction models. The rate constants of sorption for all these kinetic models were calculated. The pseudo-second order kinetic reaction model was found to be the best for correlation of the data for phosphate removal from aqueous solution using modified clinoptilolite.