Preparation method of carbon aerogel for air filtration

The invention discloses a preparation method of a carbon aerogel for air filtration. The preparation method comprises the following steps: by using natural fresh pomelo peel as the raw material, carrying out hydrothermal-process carbonization, removing impurities with anhydrous ethanol, removing the anhydrous ethanol with deionized water, prefreezing, carrying out freeze-drying and the like, thereby preparing the carbon aerogel. The pyrolysis process is simple, and has the advantages of low energy consumption, simple steps and easy operation; the carbon aerogel has favorable adsorption capacity for formaldehyde, PM2.5 and other air contaminants, obviously enhances the air purification rate, and greatly lowers the injury of the air contaminants to the human body; the preparation method of the carbon aerogel is different from that of the traditional aerogel and commercial activated carbon, and the preparation process is simple and convenient; the preparation method is different from that of the traditional aero