The chemical purification processes of detonation-synthesized nanodiamond (DND) has been very important in the industry because the process is very expensive and dangerous. Especially, the chemicals including carrier acid (e.g. H2SO4, HNO3, etc.) and oxidant (e.g. HClO4, KMnO4, etc.) are expensive and chemical waste disposal causes environmental issues. Therefore, the cost effective and environmentally friendly process of DND chemical purification is very attractive to the industry.
Here, we demonstrate the recycling process of DND chemical purification with H2SO4 and KMnO4. We recycled H2SO4 with three times and characterized sp3/sp2 carbon ratio of the purified DND. The results show consistent of sp3/sp2 carbon ratio even though H2SO4 have been reused with three times. The details will be presented in this talk.