Cobalt-nickel zeolite imidazolate framework-derived porous carbon for biomethane production

Abstract

The invention relates to biomass energy utilization technology, and aims to provide a method for promoting the preparation of biomethane by porous carbon derived from cobalt-nickel zeolite imidazolate skeleton. Including: mixing the methanol solution of cobalt chloride, polyvinylpyrrolidone and dimethylimidazole, stirring vigorously, aging to obtain the cobalt zeolite imidazolate skeleton; washing, vacuum drying and grinding to obtain the cobalt zeolite imidazolate skeleton powder; dispersing in ethanol Then add nickel dichloride hexahydrate, and stir to form a cobalt-nickel zeolite imidazolate framework with an eggshell structure; place it in a tube furnace after vacuum drying, and carbonize it under nitrogen; obtain porous carbon microspheres containing cobalt-nickel nanoparticles; Cleaning with hydrofluoric acid, vacuum drying and grinding into powder to obtain porous carbon derived from cobalt-nickel zeolite imidazolate framework. The invention can effectively improve the biomethane production performance of the fermentation system, optimize the electron transfer performance of the system, increase the content of the electroactive extracellular polymer in the system, and strengthen the interspecies electron transfer mediated by the electron shuttle.

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...

AI Technical Summary

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.

Images