Preparation method of biomass-based active carbon

Abstract

The invention relates to a preparation method of biomass-based active carbon used for absorbing volatile organic pollutants and organic pollutants in waste water. The preparation method comprises following steps: 1, rice husk pretreatment, wherein rice husk is washed and dried; 2, rice husk pyrolysis charcoal preparation, wherein, clean rice husk is subjected to primary pyrolysis at 450 DEG C so as to obtain rice husk pyrolysis charcoal; and 3, the rice husk pyrolysis charcoal is mixed with potassium hydroxide at an alkali to charcoal ratio of 3:1, an obtained mixture is heated to 400 DEG C ina tubular furnace, the temperature is controlled to be constant for a certain period of time, and is increased to 750 DEG C for constant temperature treatment. The raw materials are widely available,are cheap, and are friendly to the environment; the whole reaction process conditions are mile; operation is simple, and is convenient to control. The raw materials are nontoxic and harmless, are friendly to the environment, are high in safety, are low in equipment requirement, and are beneficial for large scale production. The specific surface area of the obtained rice husk based active carbon is as high as 2094.15m<2> / g, the surface of the active carbon possesses abundant porous structures; the rice husk active carbon is used for adsorption removing of benzene series, and the removing rateis as high as 80.2%.

Description

technical field [0001] The invention relates to a preparation method of biomass-based activated carbon which can be used for adsorbing volatile organic pollutants and organic pollutants in waste water. Background technique [0002] Activated carbon is a carbonaceous material with rich pore structure, large specific surface area and special surface characteristics. It has good adsorption capacity, good chemical stability, high mechanical strength and convenient regeneration. It is widely used in environmental protection, electrode materials, Chemical industry, food processing, drug refining and other fields are essential products for the national economy and people's daily life. [0003] With the advancement of science and technology and the development of the national economy, especially in recent years, the governments of various countries have strengthened the protection and governance of the environment, further promoting the research and development of activated carbon, ...

AI Technical Summary

Problems solved by technology

Traditional activated carbon preparation mostly uses wood, charcoal, etc. as raw materials. With the enhancement of everyone's awareness of environmental protection, people have experienced the huge negative impact of the deterioration of the ecological environment on sustainable development. The country has implemented a strategy of banning logging on natural forests. , causing the source of wood and charcoal to shrink, so that the raw materials for preparing activated carbon are greatly restricted, and the price is also on the rise.

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