Method for preparing biomass graphene by using cellulose as raw material
First Claim
1. A method for preparing biomass graphene using cellulose as a raw material, comprising:
- preparing a catalyst solution, wherein a catalyst is added to distilled water to form a first mixture, the first mixture is stirred for 10 to 30 min to form a catalyst solution, in which the ratio of catalyst to solvent is within 2;
100 to 35;
100;
preparation a precursor, wherein a biomass cellulose is added to the catalyst solution to form a second mixture, the second mixture is stirred for 1 to 4 hours then deoxidized at a high temperature and dried to obtain a precursor, in which the mass ratio of cellulose to solvent is within 3;
100 to 40;
100;
heat-treating the precursor including a pre-carbonization step and a secondary carbonization step, wherein the pre-carbonization step includes heating the precursor to within 220 to 650°
C. at 10 to 20°
C./min for 1 to 6 hours in an atmosphere including at least one of nitrogen gas, argon gas, and hydrogen gas to obtain a pre-carbonized precursor, and the secondary carbonization step includes heating the pre-carbonized precursor to within 900 to 1650°
C. at 5 to 16°
C./min for 4 to 15 hours to obtain a heat-treated product; and
obtaining graphene, wherein the heat-treated product is acid-treated, centrifuged, washed with distilled water to neutral, and dried at 80-110°
C. to obtain graphene.
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Abstract
A method for preparing biomass graphene by using cellulose as a raw material includes preparing a catalyst solution, carrying out ionic coordination and high-temperature deoxidization on cellulose and a catalyst so as to obtain a precursor, carrying out thermal treatment and pre-carbonization, and carrying out acid treatment and drying to obtain the graphene. The graphene is uniform in morphology with a single-layer or multi-layer two-dimensional layered structure having a dimension of 0.5 μm to 2 μm, and an electric conductivity of 25000 S/m to 45000 S/m. The graphene can be applied to electrode materials of super capacitors and lithium ion batteries, and can also be added to resin and rubber as an additive so as to improve physical properties of the resin and the rubber.
2 Citations
10 Claims
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1. A method for preparing biomass graphene using cellulose as a raw material, comprising:
-
preparing a catalyst solution, wherein a catalyst is added to distilled water to form a first mixture, the first mixture is stirred for 10 to 30 min to form a catalyst solution, in which the ratio of catalyst to solvent is within 2;
100 to 35;
100;preparation a precursor, wherein a biomass cellulose is added to the catalyst solution to form a second mixture, the second mixture is stirred for 1 to 4 hours then deoxidized at a high temperature and dried to obtain a precursor, in which the mass ratio of cellulose to solvent is within 3;
100 to 40;
100;heat-treating the precursor including a pre-carbonization step and a secondary carbonization step, wherein the pre-carbonization step includes heating the precursor to within 220 to 650°
C. at 10 to 20°
C./min for 1 to 6 hours in an atmosphere including at least one of nitrogen gas, argon gas, and hydrogen gas to obtain a pre-carbonized precursor, and the secondary carbonization step includes heating the pre-carbonized precursor to within 900 to 1650°
C. at 5 to 16°
C./min for 4 to 15 hours to obtain a heat-treated product; andobtaining graphene, wherein the heat-treated product is acid-treated, centrifuged, washed with distilled water to neutral, and dried at 80-110°
C. to obtain graphene. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification