2015-05-042015-05-042009-02-24Marek, Irene Morin, Wang, Yuhuang, Hauge, Robert H. and Shan, Hongwei, "Purification of carbon nanotubes based on the chemistry of fenton's reagent." Patent US7494639B2. issued 2009-02-24. Retrieved from https://hdl.handle.net/1911/79984.https://hdl.handle.net/1911/79984The present invention is directed to methods of purifying carbon nanotubes (CNTs). In general, such methods comprise the following steps: (a) preparing an aqueous slurry of impure CNT material; (b) establishing a source of Fe2+ ions in the slurry to provide a catalytic slurry; (c) adding hydrogen peroxide to the catalytic slurry to provide an oxidative slurry, wherein the Fe2+ ions catalyze the production of hydroxyl radicals; and (d) utilizing the hydroxyl radicals in the oxidative slurry to purify the CNT material and provide purified CNTs.12 ppengUtility patentUS7494639B2