Synthesis of Carbon Nanotubes using Electric Arc Furnace Slag as a Source of Catalyst
Keywords:
carbon nanotubes, hematite, electric arc furnace slag, chemical vapor deposition.Abstract
Low-cost productions of high-quality multiwall carbon nanotubes (MWCNTs) have been widely studied. Carbon nanotubes have been synthesized using thermal chemical vapor deposition previously. In this paper, high purity and quality of MWCNTs with about 30 nm in diameter have been successfully produced using catalyst derived from electric arc furnace slag (EAFS) and acetylene gas (C2H2) as a carbon source via chemical vapor deposition. The hematite catalyst was extracted from EAFS using simple reflux and re-precipitation process. Catalyst and CNTs was characterized using field emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM), thermogravimetric analysis (TGA) and Raman spectroscopy. The carbon nanotubes were highly graphitized (ID/IG ratio = 0.36) and have higher purity up to 93 %. Because the catalyst is the unsupported catalyst, they can be removed from carbon nanotubes by simple reflux with a low concentration of hydrochloric acids for only 30 minutes. In a nutshell, the utilization of EAFS not only solve the environmental problem causes by the dumping of EAFS in the landfill, it also produces a value-added product such as MWCNTs.
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