Abstract
Water purification from radionuclides was investigated using an effective and low-cost adsorbent produced in high quantities from the fuel combustion in power stations where mazote, coal and other fuels are extensively used. Fly ash's particles were used to investigate the removal of uranium-238 ions, in the concentration range of 27.9, 55.8, 111.6 Bq/l from ground water. In order to investigate the effect of various parameters including pH, contact time, initial metal ion concentration, dose adsorbent and temperatures, batch tests have been performed. The optimum contact time was 30 minutes and the appropriate pH was found to be 4.5. The temperature effects on kinetics and equilibrium were closely investigated in fly ash pores. Endothermic findings and a temperature rise resulted in an increase in the adsorption rate of uranium-238. Data was applied at different temperatures (293, 303 and 313 K) with the isotherms Langmuir, Freundlich and Dubinin - Radushkevich. The best way to explain the data was to find the Langmuir Adsorption Model. Adsorption kinetics have been studied in pseudo-first, pseudo-second order. A pseudo-second-order mechanism was the best in fitting the data. Thermodynamic parameters; Delta H degrees, Delta G degrees, and Delta S degrees have been studied. SEM is used to assess morphological changes in the fly ash surfaces following adsorption of uranium-238 ions.