▎ 摘　　要

NOVELTY - Nano coating comprises 15-30 pts. wt. nano tourmaline powder, 5-10 pts. wt. nano titanium dioxide powder, 5-10 pts. wt. activated carbon powder, 5-10 pts. wt. zeolite powder, 20-30 pts. wt. volcanic stone powder, 5-10 pts. wt. nano silver powder, 10-20 pts. wt. nano white bamboo charcoal powder, 4-12 pts. wt. graphene powder, 4-8 pts. wt. sodium silicate, 10-15 pts. wt. acrylic acid, 10-20 pts. wt. ethanol, and 5-10 pts. wt. water. USE - The nano coating is useful for indoor air purification (claimed). ADVANTAGE - The coating can efficiently promote the release of organic compounds in the material through the limitation of each raw material, and can remove the organic compound and has an excellent bactericidal effect. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) a method for preparing nano-coating, comprising (i) adding sodium silicate, propionic acid and ethanol into water and stirring to obtain mixed solution, (ii) mixing activated carbon powder, zeolite powder and volcanic rock powder to obtain mixed material, (iii) mixing and stirring mixed solution and mixed material, adding nano tourmaline powder, nano titanium dioxide powder, graphene powder, nano silver powder and nano white bamboo charcoal powder, and stirring at high speed; and (2) an indoor air purification method, comprising spraying nano-coating on an aluminum plate, placing the aluminum plate indoors and heating the aluminum plate to 100-200degrees Celsius for air purification.