Preparation method of high adsorptive activated carbon

Abstract

The invention discloses a preparation method of high adsorptive activated carbon and belongs to the technical field of activated carbon preparation. The preparation method specifically comprises the following steps of: uniformly mixing an organic solvent lignin with an aqueous solution of an activator (its mass concentration is 25-50%), drying at 105-120 DEG C, carrying out carbonization and activation at 600-900 DEG C with the activation time being 1-3h, cooling to room temperature after carbonization and activation, boiling with water, carrying out thermal filtration, washing until pH value is 6.5-7.5, drying, and grinding to obtain the activated carbon. The lignin is derived from green separative products of crop straw; the carbonization and activation process is simple; there is few emission pollutants; and the prepared activated carbon has large specific surface area, strong adsorbability and substantial benefits, economic significance and social benefits, and is mainly used in the fields of food industry, pharmaceutical industry, chemical industry, energy, environmental protection and the like.

Description

technical field [0001] The invention relates to a method for preparing activated carbon, in particular to a method for preparing activated carbon from straw lignin. Background technique [0002] As a porous carbon-containing material, activated carbon has a well-developed pore structure and a huge specific surface area inside, and different types of oxygen-containing groups on the surface. It has the functions of decolorization, purification, disinfection and deodorization, and decontamination. Used in food industry, pharmaceutical industry, chemical industry, energy and environmental protection and other fields. According to the latest report, the global demand for activated carbon is expected to grow rapidly at an average annual rate of 9.9% in the next five years, and by 2014 the global demand for activated carbon will reach 1.7 million tons. Among them, the United States, the world's largest activated carbon market, will grow at an average annual rate of more than 15%. ...

AI Technical Summary

Problems solved by technology

It is estimated that about 150 to 180 million tons of industrial lignin are discharged every year in the world, most of which are used as heat sources, and less than 1% (mainly lignosulfonate) is reused as organic chemical resources, and some Discharged into environmental pollutants, which not only caused serious environmental pollution but also caused a lot of waste of resources

Therefore, the carbonate with weaker alkalinity and less corrosion to equipment becomes a better activator in the process of preparing activated carbon by chemical activation (D Adinata, W M A W Daud, M K Aroua. Preparation and characterization of activated carbon from palm shell .by chemical activation with K 2 CO 3 , Bioresource Technology, 2007, 98: 145-149.II Gurten, M Ozmak, E Yagmur, et al. Preparation and characterization of activated carbon from. Biomass and bioenergy, 2012, 37: 73-81.), but with lignin There is no relevant patent document for the process of preparing activated carbon as raw material

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