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In this study, the hierarchical mesoporous carbon (HMC) was synthesized by the hydrothermal method. The batch adsorption experiments showed that HMC exhibited the ultrafast equilibrium fate (80 % U(VI) capture efficiency within 5 min), high UO 2  2+  capture capacity (210 mg/g, pH = 4.5) and well recyclability. The investigations of XPS techniques indicated the oxygen-containing functional groups were responsible for high efficient UO 2  2+  adsorption. The pH-dependent adsorption was simulated by three surface complexation modellings, revealing that UO 2  2+  adsorption on HMC was excellently fitted by triple layer model using two inner-sphere complexes (i. e. SOUO 2  +  and SOUO 2 (CO 3 ) 3  5−  species) compared to constant capacitance model and diffuse layer model. These findings are crucial for expanding actual applications of HMC towards the removal of radionuclides under environmental cleanup.

Ultrafast and highly capture of U(VI) by hierarchical mesoporous carbon