Mô hình hấp phụ đẳng nhiệt và động học hấp phụ phosphat trên vật liệu hydrotalcit Mg-Al/CO3

Abstract

In this paper, the hydrotalcite Mg-Al/CO3 material was synthesized successfully with an Mg/Al molar ratio of 2:1 by the co-precipitation method. SEM images, XRD patterns and FTIR Spectra and Energy Dispersive X-ray Spectra (EDX) of the material were analyzed. Equilibrium adsorption isotherms and kinetic models of the phosphate adsorption process on the hydrotalcite material Mg-Al/CO3 were investigated. The experimental data were analyzed by Langmuir and Freundlich models of adsorption. The phosphate adsorption on the material was well fitted to both Langmuir and Freundlich isotherms, and the maximum adsorption capacity was found to be 46.95 mg/g with the material sample was calcined at 600oC. The kinetic data obtained at different concentrations have been analyzed using a pseudo-first-order and a pseudo-second-order equation. The experimental data fitted very well with the pseudo-second-order kinetic model.