文献类型：期刊文献

英文题名：One-Pot Synthesis of LDH/GO Composites as Highly Effective Adsorbents for Decontamination of U(VI)

作者：Linghu, Wensheng[1];Yang, Hai[1];Sun, Yanxia[1];Sheng, Guodong[1];Huang, Yuying[2]

机构：[1]Shaoxing Univ, Coll Chem & Chem Engn, Shaoxing 312000, Zhejiang, Peoples R China;[2]Chinese Acad Sci, Shanghai Inst Appl Phys, SSRF, Shanghai 201204, Peoples R China

年份：2017

卷号：5

期号：6

起止页码：5608

外文期刊名：ACS SUSTAINABLE CHEMISTRY & ENGINEERING

收录：SCI-EXPANDED(收录号：WOS:000402950000125)、、EI(收录号：20172303743269)、Scopus(收录号：2-s2.0-85020193754)、WOS

基金：This work was supported by the Shaoxing University of Research Startup Project (20155029), Natural Science Foundation of Zhejiang Province (LY1513070001) and National Natural Science Foundation of China (21577093, 21207092).

语种：英文

外文关键词：Uranium; LDH; Graphene oxide; Modeling; Spectroscopic techniques

外文摘要：The removal mechanism of U(VI) on Mg-Al-layered double hydroxide-supported graphene oxide (LDH/GO) composites was investigated by batch, spectroscopic, and surface complexation modeling. The batch experiments showed that the enhanced removal of U(VI) on LDH and LDH/GO composites in the presence of carbonate was observed at pH < 5.0, whereas the presence of carbonate significantly inhibited U(VI) removal at pH starting from 7.0 to 9.0. It is demonstrated that the oxygenated functional groups (i.e., -OH) were responsible for the high effective removal of U(VI) by XPS analysis. The results of XANES and EXAFS spectra indicated that adsorption of U(VI) on LDH/GO composites was inner-sphere surface complexation. According to surface complexation modeling, the removal of U(VI) on LDH/GO composites can be satisfactorily fitted by a diffuse layer model with an ion exchange (X2UO2) and two inner-sphere surface complexes (SOUO2+ and SOUO2(CO3)(2)(3-) species). The maximum adsorption capacities of LDH and LDH/GO composites calculated from the Langmuir model at pH 4.5 and T = 293 K were 99.01 and 129.87 mg/g, respectively. These findings indicated that GO-based composites can be used as a highly effective adsorbents for the preconcentration and immobilization of radionuclides in environmental cleanup.