Functionalized graphene sheets with poly(ionic liquid)s and high adsorption capacity of anionic dyes

•We functionalized the graphene sheets with poly(ionic liquid) (r-GO-PIL).•The r-GO-PIL exhibited a capability of 1910mg·g−1 for methyl blue from water solution.•The facile regeneration by centrifugal separation was available for the r-GO-PIL. Graphene sheets were covalently functionalized with poly...

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Bibliographic Details
Published inApplied surface science Vol. 326; pp. 276 - 284
Main Authors Zhao, Weifeng, Tang, Yusheng, Xi, Jia, Kong, Jie
Format Journal Article
LanguageEnglish
Published Elsevier B.V 30.01.2015
Subjects
Adsorption
Covalence
Dyes
Dyes adsorption
Ethyl alcohol
Functionalization
Grafting
Graphene
Graphene sheets
Ionic liquids
Surface chemistry
X-ray photoelectron spectroscopy
Ionic liquids
Dyes adsorption
Functionalization
Graphene sheets
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Summary:•We functionalized the graphene sheets with poly(ionic liquid) (r-GO-PIL).•The r-GO-PIL exhibited a capability of 1910mg·g−1 for methyl blue from water solution.•The facile regeneration by centrifugal separation was available for the r-GO-PIL. Graphene sheets were covalently functionalized with poly(1-vinylimidazole) (PVI) type poly(ionic liquid), by utilizing a diazonium addition reaction and the subsequent grafting of PVI polymers onto the graphene sheet surface by a quaternarization reaction. The resultant modified graphene sheets showed improved dispersion property when being dissolved in DMF and ethanol. FTIR, XPS, XRD and TEM observations confirmed the success of the covalent functionalization, and thermogravimetric analysis revealed that the grafting ratio of PVI was ∼12wt%. The obtained PVI-functionalized graphene showed a high capability for removing anionic dyes such as methyl blue (MB) from water solution. The experimental data of isotherm fitted well with the Langmuir adsorption model. The adsorption capacity of 1910mgg−1 for methyl blue (MB) dye was observed for functionalized graphene sheets with poly(ionic liquid)s, which was higher than that of unmodified graphene. The high adsorption capacity observed in this study emphasizes that poly(ionic liquid)s-modified graphene materials have a great potential for water purification as they are highly efficient and stable adsorbents for sustainability.
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ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2014.11.069