Method for preparing modified activated carbon from coffee residues

Abstract

The invention provides a method for preparing modified activated carbon from coffee residues. The method includes soaking raw materials, namely, the coffee residues, in sodium hydroxide solution at first; carbonizing the coffee residues at the high temperatures to increase the specific surface areas of the coffee residues, spraying potassium chloride solution on the coffee residues, activating the coffee residues at the high temperatures again and keeping the temperatures of the coffee residues constant; activating the coffee residues by the aid of water vapor, spraying iron sulfate solution on the coffee residues and carrying out activating treatment on the coffee residues; adding silane coupling agents into the coffee residues and grinding and smashing the silane coupling agents and the coffee residues; adding potassium ferrate, diatomaceous earth and MnO2 into the coffee residues, sufficiently grinding the potassium ferrate, the diatomaceous earth, the MnO2 and the coffee residues and sufficiently mixing the potassium ferrate, the diatomaceous earth, the MnO2 and the coffee residues with one another to obtain mixtures; calcining and cooling the mixtures to obtain the modified activated carbon which is a final product. The method has the advantages that the modified activated carbon has abundant micropores, the micropores are slightly larger than harmful gas, the specific surface area of the modified activated carbon is larger than 3000 square meters / gram, the modified activated carbon is high in efficiency and adsorption capacity for toxic and harmful gas such as benzene, formaldehyde and ammonia gas, gaseous pollutants and harmful repugnant substances in indoor air can be effectively removed, purposes of reducing pollution and purifying the air can be achieved, and increase of the formaldehyde in the indoor air can be effectively inhibited.

Description

technical field [0001] The invention relates to the field of activated carbon preparation, in particular to a method for preparing modified activated carbon from coffee grounds. Background technique [0002] With the development of airtight modern buildings for the purpose of heat preservation, noise reduction, and energy saving, chemical substances emitted by building materials, furniture, and cigarette smoke produced by smoking are the reasons why modern people often suffer from asthma, chemical allergies, and immunity. important cause of disease. According to the U.S. Environmental Protection Agency's research, the air pollution that people breathe indoors is 2-5 times that of outdoor air, sometimes even up to 100 times, and almost 90% of modern people's activities are carried out indoors. As a result, breathing polluted indoor air for a long time can cause headaches, dizziness, fainting, irritate eyes, ears, mouth and nose, and even cause difficult-to-cure respiratory d...

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Problems solved by technology

[0003] The working principle of the air purifier is actually to rely on the physical adsorption of activated carbon to absorb harmful gases such as formaldehyde in the air. The efficiency of the existing activated carbon is relatively low, and it is basically impossible to achieve the effect of purifying the whole room. Generally, it can only purify a corner of the room. Moreover, once activated carbon reaches the adsorption saturation state, if it is not treated, it will become a poisonous source, continuously volatilize polluting gas into the air, causing secondary pollution. Activated carbon has become one of the important research directions

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