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Adsorption of uranium as uranyl ion UO22+ was investigated on the surface of pretreated refinery wastewater sludge. The sludge was chemically activated using different acids (HCl, HNO3, H2SO4, H3PO4), and its uranium uptake capacity from aqueous solution was checked after each activation process. The highest uptake capacity was obtained for sludge treated by phosphoric acid followed by washing with...
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