A kind of method utilizing banana peel to prepare carbon foam

Abstract

The invention relates to a method for preparing carbon foam by using banana peel. First prepare 0.5-4mol / L zinc nitrate solution, then measure banana peel: zinc nitrate solution = 1:1-100 mass ratio, then place banana peel in zinc nitrate solution at 20-100°C for 1-60 hours. Take out the impregnated banana peel, dry it at 50-100°C for 1-24 hours, then put it in a tube furnace, and heat the dried banana peel at a heating rate of 1-60°C / min under the protection of an inert atmosphere Carbonize at 600-1400°C for 0.5-10 hours, and finally, wash the product with 0.5-4 mol / L nitric acid or deionized water to obtain carbon foam. The process of the invention is simple and easy to control, and the cost is low, and the specific surface area of ​​the prepared carbon foam is above 300m2 / g.

Description

technical field [0001] The invention relates to a method for preparing carbon foam by using banana peel. The specific surface area of ​​the carbon foam prepared by the method of the present invention is at 300m 2 / g or more, the production process is simple and easy to control, and the cost is low. Background technique [0002] Carbon foam is a new type of carbon material with excellent properties such as high specific surface area, adjustable thermal conductivity and electrical conductivity, low thermal expansion coefficient, high specific heat capacity, and corrosion resistance. It is used in heat treatment, electrochemical double-layer capacitors and fuel cells. Electrode materials, catalysts and catalyst supports have important and very broad application prospects. When preparing carbon foams, the properties of carbon sources and the preparation process conditions often have a greater impact on the microstructure and physical properties of carbon foams. Therefore, sin...

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Problems solved by technology

For example, "Process for making carbon foam" (US Patent 6033506, 2000), "A preparation method of pitch carbon foam material" (Chinese invention patent, application number: 200510027824.9), "Method for preparing carbon foam" (Chinese invention patent , application number: 01816776.4), Method for producing carbon foam and graphite foam (Japan patent 2003286019, 2003), "a preparation method of high-strength coal tar pitch carbon foam material" (Chinese invention patent, application number: 200710173126.9), " A preparation method for high-strength thermal insulation pitch carbon foam" (Chinese invention patent, application number: 10173127.3), etc. These methods can produce carbon foams with different properties, but the limitations of their preparation are: high-pressure equipment is required, and most of the precursors are Pretreatment at 300-500°C or even higher temperature conditions is required, foaming agent needs to be added, and the production cost is relatively high

In addition, because the foaming process is not easy to control, the carbon foam structure is not easy to control, which limits the application of carbon foam to a certain extent.