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Abstract
The study of phosphate (P) fixation due to reactions which occur to the surfaces of soil minerals has been limited by a lack of different evidence on which a structural model may be based. A structural model should attempt at least to describe the co‐ordination of the adsorbed P ion, that is, to identify the immediate neighbor atoms or ions in contact with it. The kinetics of P adsorption from solution to exchangeable phases was investigated on hematite (h) and bentonite‐hematite (b‐h) system. Phosphate adsorption time was evaluated on the above samples using 1250, 2500,3750,5000, 7500 and 13500 μg P/L solutions equilibrated from 1 to 110 days. Equilibrium in P exchange reached faster in hematite than in bentonite‐hematite system. First order, Parabolic Diffusion, Elovich, modified Freundlich models, but also a new kinetic model applied on analytical data. Freundlich and the new kinetic model were found to describe P sorption for both examined samples, while Parabolic Diffusion and First order kinetic model were found better for bentonite‐hematite system while Elovich for hematite.
Notes
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