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3D nitrogen doped graphene gels as robust and sustainable adsorbents for dyes

Abstract

A series of 3D nitrogen doped graphene gels (NG) were synthesized for the dyes removal from wastewater. Their structures were characterized by XRD, SEM, TEM, element analysis, BET and XPS. It is found that the distribution of functional groups on NG surface could be significantly affected by the difference in nitrogen source, which could further influence their adsorption behaviors. Among them, the hybrid prepared from hexamethylenediamine as nitrogen source shows the best adsorbability for acidic dyes, while the hybrid obtained from ethylenediamine displays the largest adsorption capacity for basic dyes. Adsorption isotherms and kinetics were also investigated. The results indicate that the best interpretation is given by Langmuir isotherm equation, and the adsorption dynamic behavior is fit for the pseudo-first-order model. Meanwhile, intra-particle diffusion kinetics manifest rate-controlling steps include external diffusion and intra-particle diffusion. Moreover, all adsorbents exhibit excellent reusability. Therefore, NG adsorbents show potential applicative value in the treatment of dye wastewater.

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Publication details

The article was received on 11 Aug 2017, accepted on 08 Nov 2017 and first published on 08 Nov 2017


Article type: Paper
DOI: 10.1039/C7NJ02984E
Citation: New J. Chem., 2017, Accepted Manuscript
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    3D nitrogen doped graphene gels as robust and sustainable adsorbents for dyes

    J. Geng, L. Si, H. Guo, C. Lin, Y. Xi, Y. Li, X. Yan, B. Wang and L. Chen, New J. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7NJ02984E

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