In this study the effect of carbonate concentration on the sorption of uranyl ion from wastewaters was investigated. In the presence of carbonate ions, uranyl cation form a stable anionic complex which disturbs the removal of uranyl by cation exchangers such as zeolite P and A. These zeolites were loaded with some cations and investigated for the sorption of the complex. The sorption of uranyl by a surfactant-modified zeolite was investigated too. Because of low selectivity of these samples, a MCM-41/ZSM-5 composite was synthesized and loaded with a cation and the sorption of mentioned complex by composite was also investigated and the results were promising.

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