Preparation method of cigarette end biochar material for selectively adsorbing ammonia in smoke

Abstract

The invention discloses a preparation method of a cigarette end biochar material for selectively adsorbing ammonia in smoke, which comprises the following steps: cleaning waste cigarette ends, addinginto a sodium hydroxide water solution, stirring and filtering the mixture, and drying the material to obtain a solid sample for later use; putting the solid sample prepared in the previous step together with a certain amount of trithiocyanuric acid and CaCl2 into a ball mill to be milled into mixed powder; transferring the mixed powder prepared in the previous step into a tubular furnace, calcining under the protection of inert gas, naturally cooling after calcining is completed, then washing the material with a mixed solution of ultrapure water and ethanol for multiple times, and drying thematerial to obtain the sulfur-calcium co-doped biochar material. The sulfur-calcium co-doped biochar material prepared by the method has many active sites, large specific surface area and good adsorption effect on ammonia, and waste cigarette butts can also generate more oxygen-containing functional groups in the calcining process; the functional groups can generate electrostatic adsorption, ion exchange and hydrogen bond attraction, so that the adsorption effect of the sulfur-calcium double-doped biochar material on ammonia is greatly improved.

Description

technical field

[0001] The invention relates to the field of biochar material modification, in particular to a method for preparing a cigarette butt biochar material which selectively absorbs ammonia in flue gas. Background technique

[0002] Ammonia (Ammonia, that is, ammonia), is a compound of nitrogen and hydrogen, the molecular formula is NH 3 , is a colorless gas with a strong pungent odor. It is easily soluble in water, and 1 volume of water can dissolve 700 times the volume of ammonia under normal temperature and pressure. The aqueous solution is also called ammonia water. It can be turned into a liquid by cooling and pressurizing, and liquid ammonia is a refrigerant. Ammonia is also an important raw material for the manufacture of nitric acid, fertilizers, and explosives. Ammonia is also a direct or indirect constituent of all medicines. Ammonia has a wide range of uses, but it also has dangerous properties such as corrosiveness. Ammonia is a naturally occurring...

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