A kind of preparation method of porous carbon material

Abstract

The invention belongs to the technical field of preparation of porous materials and in particular relates to a preparation method of a porous carbon material. A technological process comprises the following six steps: preparing a carrageenan water solution, preparing a metal salt solution, preparing hydrogel, washing and freezing the hydrogel, freeze-drying the hydrogel and preparing the porous carbon material. The porous carbon material is prepared based on carrageenan and the carrageenan is heated and dissolved into secondary distilled water to form a carrageenan solution; then the carrageenan solution and the metal salt solution are mixed to be subjected to gelation reaction, so as to generate the hydrogel; then the hydrogel is washed, frozen, freeze-dried and pyrolyzed to prepare the Fe and S hybridized porous carbon material; in the preparation process, the reaction is moderate and easy to control and the yield and the purity of the product are high; a novel method is provided for synthesis of the porous carbon material and an application field of the porous carbon material is expanded; the technological process has the advantages of simplicity, scientific and reasonable principle, strong operability, environment protection and energy saving, friendly utilization environment and wide application prospect.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of porous material preparation, and in particular relates to a method for preparing porous carbon material. The Fe (iron) and S (sulfur) hybrid porous carbon material is prepared based on carrageenan, which has the advantages of low cost, short time consumption, environmental protection and energy saving and The advantage of simplicity and ease of use. [0003] Background technique: [0004] Porous material is a material with a network structure composed of interconnected or closed pores. The boundary or surface of the pores is composed of pillars or plates. There are two typical pore structure forms: one is formed by a large number of polygonal pores aggregated on a plane The two-dimensional structure of a honeycomb is called a honeycomb material because its shape is similar to the hexagonal structure of a honeycomb; more generally, another three-dimensional structure formed by a large number of poly...

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Problems solved by technology

[0007] At present, the existing porous carbon material preparation methods have the defects of complex synthesis process, long synthesis cycle, high cost, difficult to obtain raw materials, and poor environmental protection. People try to use different methods to manufacture porous carbon materials with various pore shapes, pore sizes and structures. How to realize the regulation of the structure of porous carbon materials and doping other elements to improve the characteristics of porous carbon materials has become a research trend of new porous carbon materials; Carrageenan, because carrageenan is a hydrophilic colloid extracted from red algae seaweeds such as Eucheuma, Geliflower, and Carrageenan, its chemical structure is a polysaccharide sulfate ester composed of galactose and anhydrogalactose Calcium, potassium, sodium, ammonium salts of calcium, potassium, sodium, ammonium salts, according to the difference of sulfate ester binding form, carrageenan is divided into K type (Kappa), I type (Iota), L type (Lambda), and carrageenan in the prior art is widely used Used in the manufacture of jelly, ice cream, pastry, soft candy, canned food, meat products, eight-treasure porridge, white fungus bird's nest, soup food and cold salad food, based on the strong stability of carrageenan, the dry powder is not easy to degrade after long-term storage, in neutral and alkaline solutions It is also very stable, even if it is heated, it will not be hydrolyzed. A low-cost, short-time-consuming, environmentally friendly and simple method for preparing Fe (iron) and S (sulfur) hybrid porous carbon materials based on carrageenan is developed. Has good economic and social benefits

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