Sorption of Ammonium Ions onto Natural and Modified Egyptian Kaolinites : Kinetic and Equilibrium Studies

Abstract EN

Thermally activated, acid-activated, and acid-leached of thermally activated kaolinites were prepared from the Egyptian ore.

The physical and chemical properties were studied using N2 sorption at −196°C, FTIR, SEM, and the total surface acidity.

The sorption of NH4+ ions on the investigated sorbents was controlled with the solution pH, sorbent dosage, and initial concentration of NH4+ solution.

Kinetic and equilibrium NH4+ sorption at 30°C were employed.

Four kinetic models were applied to the kinetic sorption data; pseudo-second-order, Elovich, and intraparticle diffusion models fitted well the kinetic data whereas pseudo-first-order model was less applicable.

Elovich parameters refer to physical sorption type of NH4+ on nonuniform sites and the intraparticle diffusion controls the sorption of NH4+ by kaolinites to a small extent.

The equilibrium sorption data followed Langmuir and D-R models; the negative value of ΔG indicates a spontaneous sorption and the mean sorption energy obtained shows also physical sorption.

The sorption capacities of nonactivated and activated Egyptian kaolinites towards NH4+ sorption (10.87–45.45 mg·g−1) were good sorbents as compared with those uptaken by other clays reported in the literature and proved to be more active besides being less expensive and highly available.