According to the adsorption characteristics of activated carbon, activated carbon is mainly used to remove pollutants in water, decolor, filter and purify liquids and gases. It is also used for air purification, waste gas recovery (such as the recovery of gas benzene in the chemical industry), and precious metals. Recycling and refining. Activated carbon is mainly made of materials with high carbon content, such as wood, coal, fruit shells, bones, and petroleum residues. With coconut shell as the most commonly used raw material, its adsorption effect is formed by physical and chemical absorption, and its appearance is black in color.