| CPC C01B 32/172 (2017.08) [B01D 57/02 (2013.01); C01B 32/159 (2017.08); C01B 2202/22 (2013.01); Y10T 428/30 (2015.01)] | 12 Claims |

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1. A nanocarbon separation method, comprising:
preparing a nanocarbon dispersion liquid in which a nanocarbon and a non-ionic surfactant are dispersed in a solvent;
injecting the nanocarbon dispersion liquid into a separation tank;
applying a direct current voltage to a first electrode provided at an upper part of the interior of the separation tank and a second electrode provided at a lower part of the interior of the separation tank and generating a pH gradient in the nanocarbon dispersion liquid inside the separation tank; and
separating metallic nanocarbons and semiconductor nanocarbons included in the nanocarbon dispersion liquid,
wherein an amount of the non-ionic surfactant in the nanocarbon dispersion liquid in the separation tank is 1 wt % or more and 5 wt % or less.
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