Ultrafast and highly capture of U(VI) by hierarchical mesoporous carbon
Author:
Guo Han1, Li Ying1, Wang Huihui1, Zhang Ning1, Ishag Alhadi1, Mei Peng1, Alsulami Hamed2, Alhodaly Mohammed Sh.2, Sun Yubing12
Affiliation:
1. MOE Key Laboratory of Resources and Environmental System Optimization, College of Environmental Science and Engineering, North China Electric Power University , Beijing , 102206 , P.R. China 2. Department of Mathematics, Faculty of Science , King Abdulaziz University , P.O. Box 80203 , Jeddah, 21589 , Saudi Arabia
Abstract
Abstract
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 UO2
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 UO2
2+ adsorption. The pH-dependent adsorption was simulated by three surface complexation modellings, revealing that UO2
2+ adsorption on HMC was excellently fitted by triple layer model using two inner-sphere complexes (i. e. SOUO2
+ and SOUO2(CO3)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.
Funder
National Natural Science Foundation of China
Publisher
Walter de Gruyter GmbH
Subject
Physical and Theoretical Chemistry
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