Characteristics of ammonium adsorption by the natural clinoptilotite
沸石吸附铵离子的若干性质的研究

The kinetics of NH4+ adsorption and desorption by a naturalzeolite clinoptilotite were investigated. Kinetic models evaluated at different equilibrium NH4+ concentrations included the first-order kinetics, modified Freundlich, parabolic diffusion, and heterogeneous diffusion. They described the NH4+ adsorption process well, with r2 values ranging from 0.843 to 0.997. The desorption of the adsorbed NH4+ was far more rapid than the adsorption. The influence of pH on adsorption depends on the buffer solution used and its concentration.