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Ultrafast and highly capture of U(VI) by hierarchical mesoporous carbon
Radiochimica Acta ( IF 1.4 ) Pub Date : 2020-09-25 , DOI: 10.1515/ract-2019-3233
Han Guo 1 , Ying Li 1 , Huihui Wang 1 , Ning Zhang 1 , Alhadi Ishag 1 , Peng Mei 1 , Hamed Alsulami 2 , Mohammed Sh. Alhodaly 2 , Yubing Sun 1, 2
Affiliation  

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.

中文翻译:

分级介孔碳对 U(VI) 的超快和高度捕获

摘要 本研究采用水热法合成了多级介孔碳(HMC)。批量吸附实验表明,HMC 表现出超快的平衡命运(5 分钟内 80% U(VI) 捕获效率)、高 UO2 2+ 捕获容量(210 mg/g,pH = 4.5)和良好的可回收性。XPS 技术的研究表明含氧官能团负责高效的 UO2 2+ 吸附。通过三个表面络合模型模拟了 pH 依赖性吸附,表明使用两种内球络合物(即 SOUO2 + 和 SOUO2(CO3)3 5− 物种)的三层模型非常适合 HMC 上的 UO2 2+ 吸附,与恒定电容模型和扩散层模型。
更新日期:2020-09-25
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