Sorption kinetic studies of U(VI) on inorganic and organic modified red earth: comparison of linear and non-linear methods

The sorption of U(VI) on natural red earth, inorganic modified red earth and organic modified red earth were studied under given conditions. Kinetic studies of U(VI) sorption onto the red earth samples were discussed by linear and non-linear approaches. The results indicated that the inorganic modification greatly improved the surface properties and the sorption kinetics characteristics, and that organic modification increased the sorption capacity significantly. The non-linear pseudo-second-order kinetic model could fit the kinetics much better compared with the other linear forms.