Method for promoting preparation of biomethane by cobalt-nickel zeolite imidazate framework derived porous carbon

Abstract

The invention relates to a biomass energy utilization technology, and aims to provide a method for promoting preparation of biomethane by cobalt-nickel zeolite imidazate framework derived porous carbon. The method comprises the following steps: mixing cobalt chloride, polyvinylpyrrolidone and a methanol solution of dimethylimidazole, violently stirring, and aging to obtain a cobalt zeolite imidazate framework; washing, drying in vacuum, and grinding to obtain cobalt zeolite imidazate framework powder; dispersing in ethanol, adding nickel dichloride hexahydrate, and stirring to form a cobalt-nickel zeolite imidazate framework with an eggshell structure; drying in vacuum, and carbonizing in a tube furnace under a nitrogen condition to obtain porous carbon microspheres containing cobalt-nickel nanoparticles; and washing with hydrofluoric acid, drying in vacuum, and grinding into powder to obtain the cobalt-nickel zeolite imidazate framework derived porous carbon. According to the method,the biomethane production performance of a fermentation system can be effectively improved, the electron transfer performance of the system is optimized, the content of electroactive extracellular polymeric substances in the system is increased, and electron shuttle mediated interspecific electron transfer is enhanced.

Description

technical field [0001] The invention relates to biomass energy utilization technology, in particular to a method for promoting the preparation of biomethane by porous carbon derived from cobalt-nickel zeolite imidazolate skeleton. Background technique [0002] In order to alleviate the energy crisis and environmental pollution, methane, as a renewable energy source, is playing an increasingly important role. It has the advantages of high calorific value, environmental friendliness, and wide application. Methane can be produced in a variety of ways, among which anaerobic fermentation is an ideal way, which has the advantages of less solid residue, low nutritional requirements, and high operating load rate, but at the same time has the disadvantages of slow reaction, which leads to the hydraulic retention time of the methanogenic reaction. Longer, while the rate of microbial electron transport largely determines the rate of methanogenesis. In order to save cost and reduce rea...

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Problems solved by technology

[0006] However, the above-mentioned technology of adding conductive materials to the fermentation system to enhance direct electron transfer between microbial species also has some defects. For example, the specific surface area of ​​traditional carbon-based conductive materials is relatively small, which makes it difficult to recycle and reuse; the small size of metal nanoparticles is not conducive to fermentation. Attachment and immobilization of microorganisms, etc., which lead to limited improvement of the performance of the fermentation system by adding traditional conductive materials, the degradation rate of the substrate in the system and the production rate of biomethane are not fast enough, and the hydraulic retention time needs to be further shortened to reduce production costs; The electron transfer performance of microorganisms in the system is not good, and it is difficult to meet the requirements for reducing the intermediate metabolite CO 2 Electron transfer requirements for methanogenesis; the content of electroactive extracellular polymers that play an important role in microbial extracellular electron transfer needs to be further improved, etc.

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