16 2. The method for preparing graphene from a biomass-derived carbonaceous mesophase as in 17 claim 1, wherein the base substance is one of wafer or powdery single crystalline silicon, 18 polycrystalline silicon, mica, and quartz.

20 3. The method for preparing graphene from a biomass-derived carbonaceous mesophase as in 21 claim 1, wherein the ethanol solution of the biomass-derived carbonaceous mesophase refers to a 22 solution prepared by dissolving a biomass-derived carbonaceous mesophase in absolute ethyl 23 alcohol.

25 4. The method for preparing graphene from a biomass-derived carbonaceous mesophase as in 26 claim 1, wherein the concentration of the ethanol solution of the biomass-derived carbonaceous 27 mesophase is 0.01 to 5 wt %.

29 5. The method for preparing graphene from a biomass-derived carbonaceous mesophase as in 30 claim 1, wherein a temperature during the drying is room temperature to 100 °C.

31 1 6. The method for preparing graphene from a biomass-derived carbonaceous mesophase as in 2 claim 1, wherein the hydrogen-containing atmosphere is pure hydrogen or a mixture of hydrogen 3 and nitrogen or another inert gas.

9 8. The method for preparing graphene from a biomass-derived carbonaceous mesophase as in 10 claim 1, wherein a temperature of the heat treatment is 600 to 1000 ° C, and a processing time is 1 11 to 6 hours.

13 9. The method for preparing graphene from a biomass-derived carbonaceous mesophase as in 14 claim 1, wherein the alcohol solvent is one of methanol, ethanol, normal propanol, isopropanol, 15 normal butanol, 1-pentanol, and ethylene glycol.

16 2. The method for preparing graphene from a biomass-derived carbonaceous mesophase as in 17 claim 1, wherein the base substance is one of wafer or powdery single crystalline silicon, 18 polycrystalline silicon, mica, and quartz.

20 3. The method for preparing graphene from a biomass-derived carbonaceous mesophase as in 21 claim 1, wherein the ethanol solution of the biomass-derived carbonaceous mesophase refers to a 22 solution prepared by dissolving a biomass-derived carbonaceous mesophase in absolute ethyl 23 alcohol.

25 4. The method for preparing graphene from a biomass-derived carbonaceous mesophase as in 26 claim 1, wherein the concentration of the ethanol solution of the biomass-derived carbonaceous 27 mesophase is 0.01 to 5 wt %.

29 5. The method for preparing graphene from a biomass-derived carbonaceous mesophase as in 30 claim 1, wherein a temperature during the drying is room temperature to 100 °C.

31 1 6. The method for preparing graphene from a biomass-derived carbonaceous mesophase as in 2 claim 1, wherein the hydrogen-containing atmosphere is pure hydrogen or a mixture of hydrogen 3 and nitrogen or another inert gas.

9 8. The method for preparing graphene from a biomass-derived carbonaceous mesophase as in 10 claim 1, wherein a temperature of the heat treatment is 600 to 1000 ° C, and a processing time is 1 11 to 6 hours.

13 9. The method for preparing graphene from a biomass-derived carbonaceous mesophase as in 14 claim 1, wherein the alcohol solvent is one of methanol, ethanol, normal propanol, isopropanol, 15 normal butanol, 1-pentanol, and ethylene glycol.

16 2. The method for preparing graphene from a biomass-derived carbonaceous mesophase as in 17 claim 1, wherein the base substance is one of wafer or powdery single crystalline silicon, 18 polycrystalline silicon, mica, and quartz.

20 3. The method for preparing graphene from a biomass-derived carbonaceous mesophase as in 21 claim 1, wherein the ethanol solution of the biomass-derived carbonaceous mesophase refers to a 22 solution prepared by dissolving a biomass-derived carbonaceous mesophase in absolute ethyl 23 alcohol.

25 4. The method for preparing graphene from a biomass-derived carbonaceous mesophase as in 26 claim 1, wherein the concentration of the ethanol solution of the biomass-derived carbonaceous 27 mesophase is 0.01 to 5 wt %.

29 5. The method for preparing graphene from a biomass-derived carbonaceous mesophase as in 30 claim 1, wherein a temperature during the drying is room temperature to 100 °C.

31 1 6. The method for preparing graphene from a biomass-derived carbonaceous mesophase as in 2 claim 1, wherein the hydrogen-containing atmosphere is pure hydrogen or a mixture of hydrogen 3 and nitrogen or another inert gas.

9 8. The method for preparing graphene from a biomass-derived carbonaceous mesophase as in 10 claim 1, wherein a temperature of the heat treatment is 600 to 1000 ° C, and a processing time is 1 11 to 6 hours.

13 9. The method for preparing graphene from a biomass-derived carbonaceous mesophase as in 14 claim 1, wherein the alcohol solvent is one of methanol, ethanol, normal propanol, isopropanol, 15 normal butanol, 1-pentanol, and ethylene glycol.

16 2. The method for preparing graphene from a biomass-derived carbonaceous mesophase as in 17 claim 1, wherein the base substance is one of wafer or powdery single crystalline silicon, 18 polycrystalline silicon, mica, and quartz.

20 3. The method for preparing graphene from a biomass-derived carbonaceous mesophase as in 21 claim 1, wherein the ethanol solution of the biomass-derived carbonaceous mesophase refers to a 22 solution prepared by dissolving a biomass-derived carbonaceous mesophase in absolute ethyl 23 alcohol.

25 4. The method for preparing graphene from a biomass-derived carbonaceous mesophase as in 26 claim 1, wherein the concentration of the ethanol solution of the biomass-derived carbonaceous 27 mesophase is 0.01 to 5 wt %.

29 5. The method for preparing graphene from a biomass-derived carbonaceous mesophase as in 30 claim 1, wherein a temperature during the drying is room temperature to 100 °C.

31 1 6. The method for preparing graphene from a biomass-derived carbonaceous mesophase as in 2 claim 1, wherein the hydrogen-containing atmosphere is pure hydrogen or a mixture of hydrogen 3 and nitrogen or another inert gas.

9 8. The method for preparing graphene from a biomass-derived carbonaceous mesophase as in 10 claim 1, wherein a temperature of the heat treatment is 600 to 1000 ° C, and a processing time is 1 11 to 6 hours.

13 9. The method for preparing graphene from a biomass-derived carbonaceous mesophase as in 14 claim 1, wherein the alcohol solvent is one of methanol, ethanol, normal propanol, isopropanol, 15 normal butanol, 1-pentanol, and ethylene glycol.