Synthesis of novel functional hydrothermal carbon spheres for removal of uranium from aqueous solution

A novel chelate sorbent (bis-3,4-dihydroxybenzy) p -phenylen diamine-grafted hydrothermal carbon spheres (HCS-BDBPD) had been successfully synthesized through chemical grafting method. FT-IR and SEM were used to analyze the chemical and microscopy structure of HCS-BDBPD. The batch experiments were carried out to study uranium adsorption properties of HCSs-BDBPD aimed at confirming the optimum condition for removal uranium from waste. The result showed that the sorption process was spontaneous and endothermic in nature and the maximum uranium sorption capacity of 272 mg/g was obtained under the conditions tested, the selectivity of HCSs toward uranium was improved after grafting BDBPD groups on the surface of HCSs.