One-Pot Synthesis of LDH/GO Composites as Highly Effective Adsorbents for Decontamination of U(VI)
Linghu, WS; Yang, H; Sun, YX; Sheng, GD; Huang, YY
2017
发表期刊ACS SUSTAINABLE CHEMISTRY & ENGINEERING
ISSN2168-0485
卷号5期号:6页码:5608-5616
文章类型期刊论文
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.
关键词Graphene Oxide Nanosheets Layered Double Hydroxides Multiwalled Carbon Nanotubes Nanoscale Zerovalent Iron Modeling Techniques Enhanced Adsorption Efficient Removal Aqueous-solutions Theoretical Calculations Competitive Sorption
DOI10.1021/acssuschemeng.7b01303
关键词[WOS]GRAPHENE OXIDE NANOSHEETS ; LAYERED DOUBLE HYDROXIDES ; MULTIWALLED CARBON NANOTUBES ; NANOSCALE ZEROVALENT IRON ; MODELING TECHNIQUES ; ENHANCED ADSORPTION ; EFFICIENT REMOVAL ; AQUEOUS-SOLUTIONS ; THEORETICAL CALCULATIONS ; COMPETITIVE SORPTION
收录类别SCI
语种英语
WOS记录号WOS:000402950000125
引用统计
文献类型期刊论文
条目标识符http://ir.sinap.ac.cn/handle/331007/28760
专题中科院上海应用物理研究所2011-2018年
推荐引用方式
GB/T 7714
Linghu, WS,Yang, H,Sun, YX,et al. One-Pot Synthesis of LDH/GO Composites as Highly Effective Adsorbents for Decontamination of U(VI)[J]. ACS SUSTAINABLE CHEMISTRY & ENGINEERING,2017,5(6):5608-5616.
APA Linghu, WS,Yang, H,Sun, YX,Sheng, GD,&Huang, YY.(2017).One-Pot Synthesis of LDH/GO Composites as Highly Effective Adsorbents for Decontamination of U(VI).ACS SUSTAINABLE CHEMISTRY & ENGINEERING,5(6),5608-5616.
MLA Linghu, WS,et al."One-Pot Synthesis of LDH/GO Composites as Highly Effective Adsorbents for Decontamination of U(VI)".ACS SUSTAINABLE CHEMISTRY & ENGINEERING 5.6(2017):5608-5616.
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