Uranium recovery from uranium-containing wastewater. (A) Schematic of the uranium recovery device for treating uranium-containing wastewater. (B) Images of SWTC-PAO sponge loaded in the extraction unit. (C) Metal ion concentrations in the wastewater before and after uranium recovery. (D) Extraction kinetics of SWTC-PAO sponge in wastewater. The change curve of uranium concentration is shown. (E) Process for separating and purifying uranium from the eluate. (F) XRD patterns of UO₂(NO₃)₂·6H₂O and the product recovered from uranium-containing wastewater.