Efficient electrocatalytic uranium removal and potential mechanism by hollow nitrogen-doped porous carbon-supported high-entropy alloy
A hollow nitrogen-doped porous carbon-supported high-entropy alloy(HEA@HNPC)was successfully prepared by ion exchange and used as an electrocatalyst for the removal of uranium from an aqueous solution.The as-synthesized HEA@HNCC possessed the feature of flexible element composition,adjustable surface electronic structure,and plentiful catalytic active sites.The removal performance for uranyl by HEA@HNCC electrocatalyst from aqueous solution and simulated groundwater was investigated,respectively.The results showed that the HEA@HNPC electrocatalyst exhibited fast kinetics,large extraction capacity,excellent selectivity and enhanced recycling stability for uranium removal,and removal efficiency of uranium by HEA@HNPC was up to 381.6 mg g-1d-1 in scale-up experiments.SEM,XRD,and XPS were used to analyze the electrochemical products,and it could be found that the reduced U(Ⅳ)would form a mixture solid with the CaCO3 precipitation to achieve efficient and continuous removal of uranium from aqueous solution.The electrochemical cyclic voltammetry(CV)curve revealed that the H*ad with strong reducing properties generated on the HEA@HNCC surface was the key species for U(Ⅵ)→U(Ⅳ)electroreduction.This discovery provides a significant reference for the mechanism research of the uranium removal from aqueous solution by electrochemical technology.
HEA@HNPCelectrochemical technologyuranium removalmechanism research
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