The spent alum sludge was employed for the removal of specific fission products including 137 Cs, 85 Sr, 152+154 Eu, 99 Mo, and 99 Tc radionuclides from radioactive waste. The physicochemical features of spent alum sludge were investigated. The results illustrated that the uptake percentages were 94.2, 90.5, 87.6, 87.1, and 76.6%, correspondingly, for 99 Mo, 152+154 Eu, 99 Tc, 85 Sr, and 137 Cs. The kinetic studies illustrated that the adsorption process obeyed Langmuir kinetics which is a combination of first-order and second-order expressions. The findings demonstrated that the spent alum sludge can be applied successfully as a low-cost and effective adsorbent for the treatment of radioactive waste.
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