Reduced graphene oxide-based hydrogels for the efficient capture of dye pollutants from aqueous solutions
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- Reduced graphene oxide-based hydrogels for the efficient capture of dye pollutants from aqueous solutions
- Tiwari, Jitendra N.; Mahesh, Kandula; Le, Nhien H.; Kemp, K. Christian; Timilsina, Rupak; Tiwari, Rajanish N.; Kim, Kwang S.
- Issue Date
- PERGAMON-ELSEVIER SCIENCE LTD
- CARBON, v.56, pp.173 - 182
- Three dimensional (3D) reduced graphene oxide (RGO)-based hydrogels were synthesized by the reduction of graphene oxide using sodium ascorbate. During gelation, mono-, bi-, and trilayer graphene nanosheets self-assemble into a well-defined and interconnected 3D porous network through strong van der Waals and pi-pi interactions. The 3D RGO-based hydrogels showed a large surface area, and a uniform pore size distribution. The application of the 3D mesoporous material as an adsorbent for the removal of the organic dyes, methylene blue (MB) and rhodamine B (RhB), from aqueous solutions was investigated. The 3D RGO-based hydrogels showed excellent removal capabilities for MB (similar to 100%) and RhB (similar to 97%) due to adsorption through strong pi-pi stacking and anion-cation interactions. Toxicity tests show that the aqueous solutions purified by 3D RGO-based hydrogels are comparable to control experiments conducted using distilled water.
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