The utilization of adsorbents for the rapid and highly effective removal of uranium from wastewater is a promising method.However,the currently reported adsorbents exhibit excellent adsorption capabilities but have limited suitability within specific pH ranges.In this study,a layered CaP-1 adsorbent was synthesized from agricultural waste oyster shell powder,and its main component was identi-fied as Ca(H2PO4)2·H2O.CaP-1 showed excellent removal efficiency for U(Ⅵ)over a wide pH range(3.0～7.0),with an adsorption capacity ranging from 1702.48 to 2058.71 mg·g-1,exceeding that of many expensive adsorbents.Kinetic studies revealed that CaP-1 primarily removes U(Ⅵ)from water through chemical adsorption.Mechanistic studies demonstrated that the H2PO4-in CaP-1 can regulate the solution pH,facilitating the formation of the precipitate Ca(UO)2(PO4)·6H2O.This study provides a cost-effective,efficient,and versatile adsorbent for the removal of U(Ⅵ).
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