Synthesis, characterization and isotherm studies of new composite sorbents

摘要

With different methods, different molar ratios and different surfactants have been investigated to reach the optimum conditions for synthesized zirconium tungstate (Zr(IV)W). Zr(IV)W with different molar ratios of o-toluidine was synthesized to reach the optimum conditions for poly-o-toluidine zirconium tungstate (POTZr(IV)W). POTZr(IV)W with different molar ratios of tungstate was used to achieve the optimum conditions for poly-o-toluidine Zr(IV) tungstophosphate (POTZr(IV)WP). The Na+ capacity for all the prepared materials was investigated in order to determine the best ion exchanger towards the absorbed ions. The chemical and physical properties of materials were determined. Sorption isotherm studies of La3+, Ce3+, Nd3+ and Sm3+ ions were performed at different reaction temperatures and analysed by Langmuir, Freundlich, Dubinin-Raduchkivich and Temkin isotherm models. Thermodynamic parameters such as Delta GA degrees, Delta HA degrees and Delta SA degrees were determined and found to be endothermic and spontaneous in nature.