The K+
adsorption kinetics of
Fluvo-aquic soil and Cinnamon soil under different temperature were studied. The results showed:
1) the first order equations were the most suitable for fitting the adsorption under various temperature, with temperature increasing, the suitability of Elovich equation increased, while those of power equation and parabolic diffusion equation decreased; 2) the apparent adsorption rate constant ka and the product of ka multiplied by the apparent equilibrium adsorption q∞ increased when temperature increased, while q∞ reduced; 3) temperature influenced hardly the reaction order, the order of concentration and adsorpton site were always 1 respectively under various temperature; 4) the Gibbs free energy change △ G of potassium adsorption increased with temperature increasing, while enthalpy change △ H, entropy change △ S and activation energy Ea were independent of temperature; 5) the sorption were spontaneous process with heat releasing and entropy dropping,
Fluvo-aquic soil release more heat than Cinnamon soil.