▎ 摘　　要

NOVELTY - An air filter comprises 30-40 pts. wt. graphene, 35-55 pts. wt. active silicon, 15-25 pts. wt. clay, 5-10 pts. wt. hydrosol and 0.5-2 pts. wt. nano silver powder. USE - Air filter is used for absorbing formaldehyde. ADVANTAGE - The air filter has large surface area, strong absorption capacity, high filtration efficiency and durability, and improved strength and toughness. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of the air filter.