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Abstract
Uranium extraction from uranium-containing wastewater is a promising solution to the uranium resource shortage, but the extraction process faces significant challenges such as poor selectivity, low elution efficiency, and recovery difficulties. In this study, we developed thermally responsive uranium ion-imprinted magnetic mesoporous microspheres (Fe3O4@mSiO2@FIIP) using polymer F-127 as a thermosensitive switch and sodium phytate as a crosslinking monomer, enabling effective uranium recovery from uranium-containing wastewater. By adjusting the adsorption and elution temperatures, Fe3O4@mSiO2@FIIP achieved higher adsorption selectivity and elution efficiency compared to ion-imprinted magnetic mesoporous microspheres without F-127 (Fe3O4@mSiO2@IIP). Additionally, Fe3O4@mSiO2@FIIP demonstrated superior selectivity for uranium ions over other cations compared to non-imprinted magnetic mesoporous microspheres (Fe3O4@mSiO2@NIP). It exhibited excellent salt resistance, reaching adsorption equilibrium within 60 min with a maximum adsorption capacity of 529.5 mg/g. Life cycle assessment (LCA) and techno-economic assessment (TEA) indicated that Fe3O4@mSiO2@FIIP is more environmentally friendly and economically feasible for treating uranium-containing wastewater. This study provides a new paradigm for synthesizing thermosensitive imprinting materials, holding significant potential for uranium recovery applications.
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