The invention discloses
activated carbon for capturing
carbon dioxide and a preparation method and application thereof.The preparation method of the
activated carbon comprises the steps that waste
sludge is dried to constant weight, smashed and sieved to obtain
sludge powder, under the protection of
inert atmosphere, the
sludge powder,
oil paint and an initiator azodiisobutyronitrile are heated and stirred in ethyl
alcohol, a free
radical polymerization reaction is conducted, and the
activated carbon is obtained; the preparation method comprises the following steps: precipitating a
solid in the process, filtering,
drying, preparing oily paint sludge, carbonizing at high temperature in a tubular furnace in which N2
atmosphere is introduced, immersing the obtained carbon material in a KOH
aqueous solution, heating, stirring and reacting, after the reaction is finished, carrying out suction
filtration and
drying, and calcining and activating the dried sample in the tubular furnace in which N2
atmosphere is introduced, thereby obtaining the oily paint sludge. And immersing the activated sample in a
sulfuric acid solution, heating and stirring for reaction, and after the reaction is finished, performing suction
filtration and
drying to obtain the activated
carbon product. The activated carbon prepared by the invention has the advantages of low cost, good
adsorption selectivity and large CO2 adsorption capacity.