US 12,404,179 B2
Method for the manufacture of reduced graphene oxide from expanded Kish graphite
Thi Tan Vu, Oviedo (ES); David Noriega Perez, Oviedo Asturias (ES); and Roberto Suarez Sanchez, Aviles Asturias (ES)
Assigned to ArcelorMittal, Luxembourg (LU)
Appl. No. 17/611,277
Filed by ArcelorMittal, Luxembourg (LU)
PCT Filed May 12, 2020, PCT No. PCT/IB2020/054459
§ 371(c)(1), (2) Date Nov. 15, 2021,
PCT Pub. No. WO2020/230010, PCT Pub. Date Nov. 19, 2020.
Claims priority of application No. PCT/IB2019/054058 (WO), filed on May 16, 2019.
Prior Publication US 2022/0234898 A1, Jul. 28, 2022
Int. Cl. C01B 32/23 (2017.01)
CPC C01B 32/23 (2017.08) [C01B 2204/04 (2013.01); C01B 2204/30 (2013.01)] 30 Claims
OG exemplary drawing
 
1. A method for manufacture of reduced graphene oxide from kish graphite comprising:
A. providing kish graphite,
B. optionally, pre-treating the kish graphite,
C. intercalation of the kish graphite with a persulfate salt and an acid at room temperature to obtain intercalated kish graphite,
D. expansion of the intercalated kish graphite at room temperature to obtain expanded kish graphite,
E. oxidation of the expanded kish graphite to obtain graphene oxide, and
F. reduction of the graphene oxide into reduced graphene oxide having oxygen functional groups including ketone groups, carboxyl groups, epoxy groups and hydroxyl groups,
wherein the reduced graphene oxide has 25%, or less, of the oxygen functional groups by weight, wherein the expansion of the intercalated kish graphite at room temperature lasts from 2 to 5 minutes.