Sorption of Ni2+ ions by AlPO4 is studied as a function of concentrations and temperature at pH 7. Potentiometric titration, dissolution and FTIR studies are employed to determine the mechanism of the process of the uptake of Ni2+ ions which is found to be both the ion exchange and the surface precipitation of the corresponding metal phosphates. Freundlich equation is found applicable to the sorption data, and is employed to evaluate the thermodynamic parameters deltaH(o) and deltatS(o).
Sorption studies of Cu 2+ ions onto AlPO 4 were carried out as a function of pH (3-5) and temperature (303-323 K). The extent of sorption was found to increase with an increase in Cu 2+ ion concentration, pH and the temperature of the system. The Kurbatov equation along with a new equation based on the law of mass action were found applicable to the sorption data. The sorption mechanism was found to consist of an exchange between the H + ions from the exchanger and Cu 2+ ions from the aqueous solution. The thermodynamic parameters evaluated showed that the process was endothermic and nonspontaneous in nature. FT-IR spectroscopy was also employed to evaluate the mechanism of Cu 2+ ion sorption.
Sorption studies were conducted for Co2+ ions on AlPO4 at different concentrations and temperatures. Sorption of Co2+ was found to increase with increase in concentration and temperature. To determine the mechanism of the sorption process, dissolution of AlPO4 in the presence of Co2+ ions and desorption studies were performed which indicated the mechanism of sorption to be the ion exchange followed by precipitation. FTIR studies were also employed to confirm the proposed mechanism.
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