Method for preparing boron-doped porous carbon material with high specific surface area from biomass

Abstract

The invention relates to a method for preparing a high-specific-surface-area boron-doped porous carbon material from biomass, which comprises the following steps: pulverizing biomass into fine particles, proportionally and uniformly mixing the pulverized biomass particles with a boric acid-containing water solution to form a mixture, and putting the mixture into a hydrothermal reaction kettle to perform hydrothermal reaction; dehydrating and drying hydrothermal carbon obtained after the hydrothermal reaction; putting the dried hydrothermal carbon into a pyrolyzing furnace, and carrying out rapid pyrolysis under the protection of an inert atmosphere to obtain a biomass source boron-doped porous carbon material with high specific surface area after rapid pyrolysis; the method has the advantages of wide sources of raw materials, simple and green process, lower equipment requirements, short time consumption in the production process and high efficiency, and is suitable for industrial large-scale production.

Description

technical field [0001] The invention belongs to the field of boron-doped carbon material preparation, especially the field of biomass preparation of boron-doped porous carbon material with high specific surface area. Background technique [0002] Biomass is widely distributed in nature and has huge reserves, and it is the only carbon-neutral energy source that can replace petroleum-derived fuels and chemicals. China produces about 100 million tons of waste biomass (crop stalks, sawdust, weeds, microalgae, animal waste, etc.) every year. The energy contained in these waste biomass is equivalent to 100 million tons of standard coal, which is a huge treasure trove of resources. . Biomass can be converted into a solid substance containing a large number of aromatic ring structures through hydrothermal or pyrolysis technologies, that is, biochar, which has a very broad application prospect in the field of environment and chemical industry; in recent years, the application of car...

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Problems solved by technology

However, the preparation methods of boron-doped carbon materials reported so far have disadvantages such as complex process, difficulty in doping boron atoms, low specific surface area of ​​obtained carbon materials and micropore-dominated pore structure, which is not conducive to adsorption and mass transfer;

[0003] For example, CN201910994262.7 introduces a method of using boron-doped mesoporous carbon to remove heavy metals in water. The method uses template method to prepare boron-doped mesoporous carbon with high specific surface area: boric acid, sucrose, concentrated sulfuric acid and water are mixed in proportion It is a multi-component solution A, which is infiltrated into a mesoporous silicon template and solidified to obtain a composite A; then boric acid, sucrose, concentrated sulfuric acid and water are mixed in proportion to a multi-component solution B, and the composite A is impregnated into a multi-component solution B , solidified to obtain composite B; finally, composite B is heat-treated to remove the template to obtain boron-doped mesoporous carbon; the carbon material prepared by this method contains boron functional groups, but the template method used in the above method has many steps, The process is complex, time-consuming, and energy-consuming, and the carbon source used is sucrose, which is costly and unfavorable for large-scale industrial production; another example is CN201911344836.2 which discloses a method for preparing boron-doped carbon nanometers by using lignin. The method and product of the ball: dissolving lignin and boron-based additives in water according to a preset mass ratio to prepare a mixed solution; performing ultrasonic treatment on the mixed solution; performing drying and grinding processes on the lignin solution, Obtain lignin powder; perform pyrolysis treatment on the lignin powder, and prepare the boron-doped carbon nanospheres after cooling; although the process is simple, the carbon source is lignin, and the requirements for lignin powder are relatively high , which is not conducive to popularization, and the prepared boron-doped carbon materials have problems such as small specific surface area and low boron atom doping efficiency

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