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Melamine modified graphene hydrogels for the removal of uranium(VI) from aqueous solution

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Abstract

Melamine-modified graphene hydrogels (MA–GH) were successfully synthesized through a simple one-step method. The three-dimensional (3D) porous network of the graphene hydrogel composite was functionalized using melamine with multiple nitrogen-containing functional groups. Based on its unique network structure, large surface area and sufficient active sites, the synthesized 3D hydrogels displayed a high adsorption capacity (404.85 mg g−1), high removal rate of uranium(VI) (>90% at ppm level, or ∼75% in simulated seawater) and large KUd value (8.52 × 104 mL g−1). The adsorption process was described well using pseudo-second-order kinetics and the Langmuir isotherm model. The thermodynamic parameters indicated that the adsorption process was spontaneous and endothermic. Based on the above results, the MA–GH composites reveal promising potential as an adsorbent for capturing uranium(VI) in aqueous solution and simulated seawater.

Graphical abstract: Melamine modified graphene hydrogels for the removal of uranium(vi) from aqueous solution

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Publication details

The article was received on 01 Jun 2017, accepted on 08 Aug 2017 and first published on 10 Aug 2017


Article type: Paper
DOI: 10.1039/C7NJ01927K
Citation: New J. Chem., 2017, Advance Article
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    Melamine modified graphene hydrogels for the removal of uranium(VI) from aqueous solution

    X. Wang, R. Li, J. Liu, R. Chen, H. Zhang, Q. Liu, Z. Li and J. Wang, New J. Chem., 2017, Advance Article , DOI: 10.1039/C7NJ01927K

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