CN110872108A - Preparation method of biomass nano-porous carbon - Google Patents
Preparation method of biomass nano-porous carbon Download PDFInfo
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- CN110872108A CN110872108A CN201810994155.XA CN201810994155A CN110872108A CN 110872108 A CN110872108 A CN 110872108A CN 201810994155 A CN201810994155 A CN 201810994155A CN 110872108 A CN110872108 A CN 110872108A
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/05—Preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30
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Abstract
The invention provides a preparation method of biomass nano-porous carbon in the chemical field, which comprises the following steps of (1) selecting bamboo, coconut shell, hemp stalk and eucalyptus globulus as biomass matrix raw materials, and processing the biomass matrix raw materials; (2) the four different biomass precursor raw materials are subjected to 850 ℃ high-temperature vacuum calcination to prepare four different biomass nanoporous carbons; (3) grinding and sieving four prepared different biomass nanoporous carbons to 200 meshes (the average particle size is 70 μm), and then impregnating a metal precursor solution to obtain metal catalyst particles; (4) before introducing the metal nano-functional phase, the BNCs firstly adopt a nitric acid solution (68%) with a certain concentration to stir ions for 6 hours at room temperature so as to remove inorganic impurities and introduce oxygen-containing functional groups on the surface of a precipitation site of the enhanced metal catalyst, and then the BNCs are repeatedly washed by deionized water until the pH value is 7; the invention has simple operation.
Description
Technical Field
The invention belongs to the field of chemistry, and particularly relates to a preparation method of biomass nano-pore carbon.
Background
The activated carbon prepared by using biomass as a raw material, such as coconut shells, hemp stems, eucalyptus globulus or bamboo, has the advantages of rich source materials, low price, large specific surface area and the like, and is widely applied to microwave absorption, sewage treatment, catalyst carriers and electrochemical electrode materials. In addition, the biomass nanoporous carbon is renewable, environmentally friendly and non-toxic in source. These advantages make them one of the carbon-based materials that is being used as an emphasis in the development and synthesis of hybrid electrode materials.
However, even though biomass nanoporous carbons have a sufficiently large specific surface area, their application in electric double layer capacitors is still limited. Because they mostly contain relatively complex surface characteristics and a curved irregular and narrow channel structure, these micropores (e.g., less than 2 nm in diameter) are difficult to wet with electrolyte and cannot store charges. Therefore, the specific capacitance obtained is generally not high, with a value of 200F g-1Left and right. Research shows that the nano functional phase is loaded on the carbon-based surface, and the capacitance performance can be improved by introducing the component of the pseudocapacitance, which benefits from the high conductivity and the high specific capacitance of the carbon-based surfaceCan act synergistically. In the prior art, the problem that the blockage of carbon-based pores is greatly increased due to the deposition of nanoparticles, and the effective exertion of a carbon-based double-layer capacitor is hindered, or the poor binding force between a nano reinforcing phase and a carbon base causes the poor capacitor cycle stability is still existed, however, the biomass nano-porous carbon contains sp 2-and sp 3-bonds and complex surface properties, is different from the two-dimensional structure of a graphite plane with perfect graphene, and has the multi-dimensional, multi-scale, multi-structure and porous morphological characteristics, thereby bringing greater difficulty and influence for the subsequent introduction of a nano-scale functional phase with high uniformity and good dispersibility.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to overcome the defects in the prior art, provides the preparation method of the biomass nano-porous carbon, solves the technical problem that the surface of the active carbon prepared in the prior art is easy to block, and utilizes the influence rule of the nano-porous carbon prepared by the invention on the shape change of the nano-functional phase, so that the surface of the loaded nano-porous carbon is not easy to block.
The purpose of the invention is realized as follows: the preparation method of the biomass nanoporous carbon comprises the following steps:
(1) selecting bamboo, coconut shells, hemp stems and eucalyptus globulus as biomass matrix raw materials, and treating the biomass matrix raw materials;
(2) the four different biomass precursor raw materials are subjected to 850 ℃ high-temperature vacuum calcination to prepare four different biomass nanoporous carbons;
(3) grinding and sieving four prepared different biomass nanoporous carbons to 200 meshes (the average particle size is 70 μm), then impregnating a metal precursor solution to obtain metal catalyst particles, and respectively marking the nanoporous carbons prepared by carbonizing bamboo, coconut shell, hemp stalk and eucalyptus globulus as follows: BNC-B, BNC-C, BNC-H and BNC-L;
(4) before introducing the metal nano-functional phase, the BNCs are firstly subjected to ion stirring for 6 hours at room temperature by using a nitric acid solution (68%) with a certain concentration so as to remove inorganic impurities and introduce oxygen-containing functional groups on the surface of a precipitation site of the enhanced metal catalyst, and then are repeatedly washed by deionized water until the pH value is 7.
As a further improvement of the present invention, in the step (4), the preparation of the metal catalyst support specifically comprises the following steps: quantitative bamboo porous carbon (BNC-B) was weighed as a carrier carbon base (0.5 g) and impregnated with 0.25M Co (NO3) 2.6H 2O solution to obtain a Co loading of 1% mass fraction.
Compared with the prior art, the nano-porous carbon prepared by the method has the advantages that the influence rule of the nano-porous carbon on the shape change of the nano-functional phase is utilized, and the surface of the loaded nano-porous carbon is not easy to block; can be applied to the work of preparing the biomass nano-pore carbon.
Detailed Description
The preparation method of the biomass nanoporous carbon comprises the following steps:
(1) selecting bamboo, coconut shells, hemp stems and eucalyptus globulus as biomass matrix raw materials, and treating the biomass matrix raw materials;
(2) the four different biomass precursor raw materials are subjected to 850 ℃ high-temperature vacuum calcination to prepare four different biomass nanoporous carbons;
(3) grinding and sieving four prepared different biomass nanoporous carbons to 200 meshes (the average particle size is 70 μm), then impregnating a metal precursor solution to obtain metal catalyst particles, and respectively marking the nanoporous carbons prepared by carbonizing bamboo, coconut shell, hemp stalk and eucalyptus globulus as follows: BNC-B, BNC-C, BNC-H and BNC-L;
(4) before introducing the metal nano-functional phase, the BNCs firstly adopt a nitric acid solution (68%) with a certain concentration to stir ions for 6 hours at room temperature so as to remove inorganic impurities and introduce oxygen-containing functional groups on the surface of a precipitation site of the enhanced metal catalyst, and then the BNCs are repeatedly washed by deionized water until the pH value is 7; the preparation method of the metal catalyst load specifically comprises the following steps of weighing quantitative bamboo porous carbon (BNC-B) as a carrier carbon base (0.5 g), and soaking the carrier carbon base in 0.25M Co (NO3) 2.6H 2O solution to obtain the Co load with the mass fraction of 1%.
The acetone solution in step (4) acts as a solvent because it can effectively impregnate the carbon material and can promote the dispersion of Co (NO3)2 on the carbon substrate.
Compared with the prior art, the nano-porous carbon prepared by the method has the advantages that the influence rule of the nano-porous carbon on the shape change of the nano-functional phase is utilized, and the surface of the loaded nano-porous carbon is not easy to block; can be applied to the work of preparing the biomass nano-pore carbon.
The present invention is not limited to the above embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some technical features without creative efforts based on the disclosed technical solutions, and these substitutions and modifications are all within the protection scope of the present invention.
Claims (2)
1. The preparation method of the biomass nanoporous carbon is characterized by comprising the following steps of:
(1) selecting bamboo, coconut shells, hemp stems and eucalyptus globulus as biomass matrix raw materials, and treating the biomass matrix raw materials;
(2) the four different biomass precursor raw materials are subjected to 850 ℃ high-temperature vacuum calcination to prepare four different biomass nanoporous carbons;
(3) grinding and sieving four prepared different biomass nanoporous carbons to 200 meshes (the average particle size is 70 μm), then impregnating a metal precursor solution to obtain metal catalyst particles, and respectively marking the nanoporous carbons prepared by carbonizing bamboo, coconut shell, hemp stalk and eucalyptus globulus as follows: BNC-B, BNC-C, BNC-H and BNC-L;
(4) before introducing the metal nano-functional phase, the BNCs are firstly subjected to ion stirring for 6 hours at room temperature by using a nitric acid solution (68%) with a certain concentration so as to remove inorganic impurities and introduce oxygen-containing functional groups on the surface of a precipitation site of the enhanced metal catalyst, and then are repeatedly washed by deionized water until the pH value is 7.
2. The method for preparing biomass nanoporous carbon according to claim 1 or 2, wherein the preparation of the metal catalyst support in the step (4) specifically comprises the following steps: quantitative bamboo porous carbon (BNC-B) was weighed as a carrier carbon base (0.5 g) and impregnated with 0.25M Co (NO3) 2.6H 2O solution to obtain a Co loading of 1% mass fraction.
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| CN201810994155.XA CN110872108A (en) | 2018-08-29 | 2018-08-29 | Preparation method of biomass nano-porous carbon |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111487292A (en) * | 2020-05-18 | 2020-08-04 | 黑龙江省科学院高技术研究院 | Preparation method and application of hemp stalk biomass graphene-based sulfur-doped tin oxide composite gas-sensitive material |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111487292A (en) * | 2020-05-18 | 2020-08-04 | 黑龙江省科学院高技术研究院 | Preparation method and application of hemp stalk biomass graphene-based sulfur-doped tin oxide composite gas-sensitive material |
| CN111487292B (en) * | 2020-05-18 | 2023-03-28 | 黑龙江省科学院高技术研究院 | Preparation method and application of hemp stalk biomass graphene-based sulfur-doped tin oxide composite gas-sensitive material |
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