期刊
JOURNAL OF SOLID STATE CHEMISTRY
卷 224, 期 -, 页码 88-93出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2014.06.030
关键词
Graphene oxide; Polydopamine; Heavy metal ion adsorption; Surface functionalization
资金
- National Basic Research Program of China [2013CB933000]
- National Natural Science Foundation of China [21273270, 21004076]
- Key Development Project of Chinese Academy of Sciences [KJZD-EW-M01-3]
- Natural Science Foundation of Jiangsu Province [BK20130007]
By utilizing polydopamine (PD) nano-thick interlayer as mediator, polyethylenimine (PEI) brushes with abundant amine groups were grafted onto the surface of PD coated graphene oxide (GO) uniformly via a Michael-Addition reaction and produced a PEI-PD/GO composite nanosheets. The PEI-PD/GO composite exhibited an improved performance for adsorption of heavy metal ions as compared to PEI-coated GO and pure GO. The adsorption capacities for Cu2+, Cd2+, Pb2+, Hg2+ are up to 87, 106, 197, and 110 mg/g, respectively. To further make the GO based composite operable, PEI-PD/RGO aerogel was prepared through hydrothermal and achieved a high surface area up to 373 m(2)/g. Although the adsorption capacity of PEI-PD/RGO aerogel for heavy metal ions decreases a little as compared to PEI-PD/GO composite dispersion (38, 32, 95, 113 mg/g corresponding to Cu2+, Cd2+, Pb2+, and Hg2+, respectively), it could be recycled several times in a simple way by releasing adsorbed metal ions, indicating its potential application for cleaning wastewater. (C) 2014 Elsevier Inc. All rights reserved.
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