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In this study, a strategy has been provided for the preparation of different organic and inorganic-organic composite materials as ion exchange materials to be used for the removal of heavy metals from waste water. Polyaniline cerium phosphosilicate has been synthesized by incorporation of organic polymer polyaniline into the inorganic precipitate of cerium phosphosilicate. Scanning electron microscope (SEM), X-ray diffraction (XRD), IR and XRF have been used to characterize the structure of the different prepared materials. This new synthesized polyaniline cerium phosphosilicate was applied to remove toxic metal lanthanum La(III) from aqueous solution. The kinetic studies have been done to determine the mechanism of ion exchange system for the prepared inorganic and composite ion exchangers. The effects of different experimental parameters such as initial concentration of heavy metals, particle size, reaction temperature and drying temperature against interaction time were investigated in batch mode. The obtained data correlated well with the particle diffusion mechanism. The activation energy (Ea), activation entropy ΔS*, and diffusion coefficient D0 were evaluated. The correlation of these parameters with the ion-exchange characteristics of the material is discussed.

POLYANILINE BASED CERIUM PHOSPHOSILICATE: SYNTHESIS, CHARACTERIZATION AND DIFFUSION MECHANISM OF LA(III) IN AQUEOUS SOLUTIONS.