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Mohamed Mohamady Ghobashy, Huda Yousif Sharef, Muneer Baata — RSC Advances · Natural polysaccharides such as chitosan, alginate, cellulose, starch, carrageenan, and pectin are sustainable adsorbents for radionuclide removal. Engineered modifications enhance selectivity and capacity, achieving U( vi ) uptake above 600 mg g −1 .