Modified activated carbon for adsorbing phenol as well as preparation method and application thereof

Abstract

The invention discloses modified activated carbon for adsorbing phenol as well as a preparation method and an application of the modified activated carbon. The preparation method of the modified activated carbon for adsorbing phenol comprises the following steps: firstly, oxidizing activated carbon by adopting an oxidizing agent to obtain oxidized activated carbon; secondly, dipping the obtained oxidized activated carbon into an aqueous solution containing nitrogen-containing small molecules to obtain activated carbon adsorbed with the nitrogen-containing small molecules; and thirdly, carryingout microwave irradiation treatment on the obtained activated carbon adsorbed with the nitrogen-containing small molecules to obtain the modified activated carbon for adsorbing phenol. The surface ofthe prepared activated carbon has stable nitrogen-containing functional groups such as pyridine, pyrrole and amino, the pore structure and the specific surface area of the activated carbon are not greatly changed, the mass transfer process of phenol in the activated carbon particles is not influenced, and the adsorption capacity of the activated carbon to phenol can be effectively improved. Meanwhile, when the prepared modified activated carbon for adsorbing phenol is applied to a cigarette rate filter tip, the content of phenol in cigarette smoke is remarkably reduced, and no adverse effectis caused to cigarette aroma and smoking taste.

Description

technical field [0001] The invention belongs to the technical field of cigarette materials, and in particular relates to a modified activated carbon for adsorbing phenol, a preparation method and application thereof. Background technique [0002] Reducing the harm of cigarettes and retaining the effective aroma components in smoke are the main problems facing the current tobacco industry. As one of the main harmful components of smoke, phenol has a strong corrosive effect on human skin and mucous membranes. For a long time, researchers have developed a variety of harm reduction technologies, among which the development and application of cigarette filters is the most effective harm reduction method. Cigarette filter is to filter the particulate matter in cigarette smoke and absorb harmful components in the smoke to achieve harm reduction effect. Traditional filter materials are mainly made of acetate fiber and polypropylene fiber. These traditional filter materials have th...

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Problems solved by technology

The traditional activated carbon treatment method is to co-pyrolyze activated carbon and ammonia. Although it can achieve the purpose of eliminating oxygen-containing groups on the surface of activated carbon and increasing nitrogen-containing groups, it requires a high-temperature environment, high energy consumption, and high equipment strength.

Patent CN 107080287A discloses a method and application of activated carbon impregnation modification, which uses acid solution to activate activated carbon to increase the specific surface area and micro-mesoporous pore volume of activated carbon to increase the adsorption capacity of harmful substances in flue gas. However, this method still cannot optimize the functional groups on the surface of activated carbon; patent CN 101954274B discloses a composite material that uses a porous material as a carrier and supports an ionic sugar-containing copolymer on the outer layer to achieve the purpose of reducing phenol, but the preparation steps of this method It is cumbersome, and the outer layer copolymer may also block the micropore structure of activated carbon

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