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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
Source PublicationACS SUSTAINABLE CHEMISTRY & ENGINEERING
ISSN2168-0485
Volume5Issue:6Pages:5608-5616
Subtype期刊论文
AbstractThe 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.
KeywordGraphene 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
WOS KeywordGRAPHENE OXIDE NANOSHEETS ; LAYERED DOUBLE HYDROXIDES ; MULTIWALLED CARBON NANOTUBES ; NANOSCALE ZEROVALENT IRON ; MODELING TECHNIQUES ; ENHANCED ADSORPTION ; EFFICIENT REMOVAL ; AQUEOUS-SOLUTIONS ; THEORETICAL CALCULATIONS ; COMPETITIVE SORPTION
Indexed BySCI
Language英语
WOS IDWOS:000402950000125
Citation statistics
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/28760
Collection中科院上海应用物理研究所2011-2018年
Recommended Citation
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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