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Three dimensional graphene sponge for use as a highly efficient and recyclable absorbent for oil water separation
13th International Conference on Nanotek & Expo
December 05-07, 2016 Phoenix, USA
Oscar Bagoole, Sohail Shah, Hammad Younnes, Md. Mahfuz Rahman, Amal al Ghaferi
Masdar Institute of Science and Technology, UAE
Posters & Accepted Abstracts: J Nanomed Nanotechnol
Abstract:
Three-dimensional graphene sponges obtained by enhanced Hummer�??s method and freeze-drying are a highly efficient tool for use during oil-water separation1. Due to the hydrophobic nature of the graphene and contact angles with water in excess of 170, three dimensional graphene sponge is an invaluable and feasible substitute to various natural absorbers and organic materials such as expandable perlite and wool fibre2. Due to the high porosity of the spongy graphene, it can absorb oils from 50 times up to a maximum of 120 times its own weight in various oils. For this study, a shape-mouldable and three dimensional spongy graphene with high specific surface area used as a protean and recyclable sorbent for not only oils but also toxic solvents such as chloroform. The nanoporous characteristic allows spectroscopy and microscopic studies such as the use of Raman spectroscopy and Environmental Scanning Electron Microscopy (ESEM). We study the influence of various parameters ( porosity, hydrophobicity, surface area) on the absorption capability of the graphene sponge. Furthermore, we also report how to improve the regeneration efficiency( > 12 times) by heat treatment, adhering to the full release of absorbates (>99%) and still exhibiting the same micro and macro structure as before. In addition we will discuss how the introduction of halogen atoms to the graphene sponge enhances superhydrohobicity. The present work demonstrates that graphene sponges can be used in industry to separate oils and water. Topics regarding environmental protection will also be addressed.
Biography :
Email: bagooleoscar@hotmail.com