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Obtaining graphene from coconut lignin using high temperature plasma
Graphene is a new material derived from graphite and other carbon sources and drives an industrial revolution as a consequence of its unique properties: waterproof, translucent, malleable, excellent electrical conductivity, among others and for now more expensive than diamond. Actually, there is no process of profitable production of the material, and in addition, it is generated from a finite source. Can lignin be a raw material for graphene? Lignin could be the best renewable source of graphene due to the high presence of benzene rings that make it up. The methodology of graphene production proposed in this work consists of taking the lignin to a plasma phase where the different ions will be projected on a copper surface due to the presence of a magnetic field, where graphene will be formed. In this work, lignin has been obtained by three methods: Klason, organosolv and Kraft. The best yields were those of the Klason process, up to 49%; However, Kraft lignin presents characteristics with graphite appearance and yield of 29% when 50 mesh coconut tow was used, and when 400 mesh was used, the yield was 25%, it should be noted that this last lignin was found to be soluble in acetone, indicating that a high depolymerization of lignin was reached as analyzed by IR. The Klason and Kraft lignins will be used to obtain graphene by high temperature plasma in a controlled atmosphere.