Monolithic Porous Graphene/Poly(Vinyl Alcohol) Gels: Preparation, Structure and Dye Adsorption

Ping Wang; Yu Ping Guo

doi:10.4028/www.scientific.net/AMR.989-994.373

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Monolithic Porous Graphene/Poly(Vinyl Alcohol) Gels: Preparation, Structure and Dye Adsorption

Abstract:

The porous graphene oxide (GO) gels were prepared using the process of aqueous gel precursor freezing, solvent exchange, and ethanol drying technology. The GO sheets were consolidated by PVA and the obtained GO-PVA gel was reduced by glucose to prepare graphene nanosheet-SA (RGO-PVA) gel. GO-PVA and RGO-PVA gels exhibited the ultra-light densities of 10.52 and 11.24 mg/cm³, respectively. GO-PVA and RGO-PVA can effectively adsorb the liquids. The less the polarity of the liquid was, the more the adsorption for both GO-PVA and RGO-PVA gels was. The equilibrium and the dynamic adsorption of methylene blue dye were also investigated. The maximum adsorption capacities of dye were 571.4mg/g for GO-PVA and 81.0 mg/g for RGO-PVA at 30 oC.