CN110872110A - Method for preparing biomass nano-pore carbon - Google Patents
Method for preparing biomass nano-pore carbon Download PDFInfo
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- CN110872110A CN110872110A CN201810995507.3A CN201810995507A CN110872110A CN 110872110 A CN110872110 A CN 110872110A CN 201810995507 A CN201810995507 A CN 201810995507A CN 110872110 A CN110872110 A CN 110872110A
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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
Abstract
The invention provides a method for preparing biomass nanoporous 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 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), and then obtaining metal catalyst particles by a microwave deposition precipitation method; (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 method for preparing 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 2nm 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 conductivity of the carbon-based surface and the pseudocapacitanceSynergy in high specific capacitance performance. 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, and provides a method for preparing biomass nano-porous carbon, which solves the technical problem that the surface of an activated carbon base prepared in the prior art is easy to block.
The purpose of the invention is realized as follows: a method of making biomass nanoporous carbon, comprising the 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 obtaining metal catalyst particles by a microwave deposition precipitation method, 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: weighing a certain amount of BNC-B as a carrier carbon base (0.09 g), adding 180 mL of a reaction solution Co (NO3) 2.6H 2O of 3.4 mM of precursor metal ions, uniformly mixing, and dropwise adding a 33 mM urea solution; after the ultrasonic treatment for 3 min, the mixed suspension is placed into a microwave oven for reaction for 12 min.
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
A method of making biomass nanoporous carbon, comprising the 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 obtaining metal catalyst particles by a microwave deposition precipitation method, 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.
In the step (4), the preparation of the metal catalyst load specifically comprises the following steps: weighing a certain amount of BNC-B as a carrier carbon base (0.09 g), adding 180 mL of a reaction solution Co (NO3) 2.6H 2O of 3.4 mM of precursor metal ions, uniformly mixing, and dropwise adding a 33 mM urea solution; after the ultrasonic treatment for 3 min, the mixed suspension is placed into a microwave oven for reaction for 12 min.
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. A method of preparing biomass nanoporous carbon, comprising the 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 obtaining metal catalyst particles by a microwave deposition precipitation method, 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 step (4) of preparing the metal catalyst support specifically comprises the following steps: weighing a certain amount of BNC-B as a carrier carbon base (0.09 g), adding 180 mL of a reaction solution Co (NO3) 2.6H 2O of 3.4 mM of precursor metal ions, uniformly mixing, and dropwise adding a 33 mM urea solution; after the ultrasonic treatment for 3 min, the mixed suspension is placed into a microwave oven for reaction for 12 min.
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| CN201810995507.3A CN110872110A (en) | 2018-08-29 | 2018-08-29 | Method for preparing biomass nano-pore carbon |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111704134A (en) * | 2020-07-12 | 2020-09-25 | 兰州理工大学 | Wave-absorbing material based on agricultural and forestry waste recycling and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111704134A (en) * | 2020-07-12 | 2020-09-25 | 兰州理工大学 | Wave-absorbing material based on agricultural and forestry waste recycling and preparation method thereof |
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Application publication date: 20200310 |