UPTAKE OF URANIUM IONS BY MOLECULAR-SIEVE

Adsorption of uranium on molecular sieve ((13)X-type) has been studied as a function of shaking time, amount of adsorbent, pH, concentration of adsorbate and temperature. Uranium adsorption obeys the Langmuir a nd Dibinin-Rudushkevich isotherms equations. The values of Delta H deg rees and Delta S degrees were calculated from the slopes and intercept s of plots between 1n K-D versus 1/T. The results show endothermic hea t of adsorption but negative free energy value indicating that the pro cess of uranium adsorption on molecular sieve is favoured at high temp erature. The influence of various cations and anions on uranium adsorp tion were also studied.