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In this study,a novel alginate-polyethyleneimine hybrid aerogel(Alg-PEI)that could remove Cu2+from wastewater was prepared by using a simple one-step synthesis and vacuum freeze-drying technology.As-prepared Alg-PEI exhibited high affinity and selectivity toward Cu2+and could take up 95.1%of the Cu2+in a 0.1 mM Cu2+solution.