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：

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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。