Activated carbon modification method for removing ammonia gas in air

Abstract

The invention discloses an activated carbon modification method for removing ammonia gas in air. The method comprises the following steps of: (1) activated carbon pretreatment: cleaning activated carbon with hydrochloric acid, and opening activated carbon pore channels; (2) activated carbon modification treatment: carrying out activated carbon modification by adopting a nitric acid dipping oxidation method and an oxalic acid, phosphoric acid and succinic acid non-volatile acid load dipping method, and performing oscillation treatment by using a shaking table in the dipping process; and (3) activated carbon drying treatment; filtering the modified liquid, and drying the activated carbon. A traditional activated carbon modification method of traditional metal salt impregnation is replaced, and the problems that a metal salt is separated out to block activated carbon pores and an impregnated substance is prone to falling off to pollute the field environment are solved; an activated carbonmodification method for forming an oxygen-containing functional group through high-concentration strong oxidation is replaced, so that the influence of strong water absorption on adsorption of othersubstances by the activated carbon and the influence on the ammonia gas removal effect are avoided; activated carbon is used as a carrier, and ammonia gas is removed by using non-volatile acid, so that the adsorption capacity of the activated carbon to ammonia gas is improved.

Description

technical field [0001] The invention relates to the technical field of modified activated carbon, in particular to an activated carbon modification method for removing ammonia in air. Background technique [0002] Air pollution is becoming more and more serious, and there are a large number of nitrogen compounds in the air. Among them, ammonia gas has an unpleasant smell and can burn people's eyes, skin and mucous membranes of the respiratory tract. It has become the main pollutant in nitrogen compound pollution. How to remove the nitrogen compounds in the air Ammonia has become a problem that we must think about. [0003] Activated carbon is an artificial material with a three-dimensional structure and a large specific surface area. Activated carbon contains a large number of micropores and has a huge specific surface area, which can effectively remove color and odor, and can remove most organic pollutants and some inorganic substances in secondary sewage, including some t...

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Problems solved by technology

[0005] In the prior art, when ammonia is processed, physical adsorption is often used, but the coconut shell activated carbon activated by water vapor or potassium hydroxide has relatively low adsorption capacity for ammonia, and almost no adsorption capacity; The modification method is mostly modified by impregnation with metal salts. However, metal salts will precipitate on the surface of activated carbon and cause the following problems:

[0006] 1. The precipitated metal salts block the pores of activated carbon, which affects the adsorption capacity of activated carbon to gaseous small molecules, and then affects the removal effect of ammonia;

[0007] 2. Using modified activated carbon impregnated with metal salts, the impregnated matter is easy to fall off, polluting the site environment, and requires additional treatment of the impregnated matter that falls off;

[0009] 3. The oxygen-containing functional groups on the surface of activated carbon will increase the water absorption capacity of activated carbon, and the stronger water absorption will affect the adsorption of other substances by activated carbon, thus affecting the removal effect of ammonia;

[0010] In summary, the modified activated carbon impregnated with metal salts and the modified activated carbon with strong oxidation are not effective in removing ammonia. It is necessary to develop a new method of activated carbon modification to improve the removal effect of ammonia.

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