CATION-EXCHANGE AND SORPTION PROPERTIES OF ALUMINUM PHOSPHATE

The ion-exchange properties of amorphous aluminum phosphate have been studied in aqueous electrolyte solutions of KCl over a temperature ran ge of 300-320 K. The data were explained by the law of mass action. So rption of Cu2+, Ni2+ and Co2+ on AlPO4 was also studied as a function of temperature and concentration, and the data were fitted to Langmuir adsorption equations. In all cases the adsorption was found to increa se with increases in temperature and concentration in the selectivity order Cu2+ > Co2+ > Ni2+. Further, the values of Langmuir constants we re used to calculate the thermodynamic parameters Delta S degrees, Del ta H degrees, and Delta G degrees.