ION EXCHANGE REMOVAL OF PHOSPHATE FROM AQUEOUS SOLUTIONS

The sorption of phosphate is studied on amberlife IRA-400 as a function of temperatures (25 -55 °C) and phosphate concentrations 1.94 -3.23 mmol/L) which is found to increase with the increase in temperature and concentration of phosphate in solution. The ratios of chloride released/phosphate sorbed at all the temperatures are almost equal to one, indicating the sorption of HEOJ by the exchanger. The decrease in pH with the increase in temperature points towards the deprotonation of HJPO4 ~ before its sorption on the amber life IRA-400, The positive values of both the enthalpy and entropy show that the sorption of phosphate is endothermic and spontaneous in nature