▎ 摘　　要

NOVELTY - Composite material comprises rod-shaped cellulose nanocrystals, titanium dioxide grown on surface of rod-shaped cellulose nanocrystals, and graphene nanosheets supported on surface of titanium dioxide. USE - The composite material is useful for preparing glass, metal or fabric-based antibacterial and antiviral, formaldehyde removal and electret filter materials (claimed). ADVANTAGE - The material: is multifunctional; has good dispersibility, which can uniformly and firmly load on surface of fabric, preferably for fabric modification; has good antibacterial, antiviral and photocatalytic formaldehyde removal effects; can endow material with function of triboelectric generation; can continuously store electric charge by friction, when used for air filtration under air flow and dust purging; and has improved has anti-virus and filtration performance of electric charge, and improved filtering performance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing composite material, comprising (i) uniformly dispersing silver nitrate in glacial acetic acid and isopropanol mixed solution, and adding tetrabutyl titanate to obtain reaction solution, (ii) immersing rod-shaped cellulose nanocrystals in reaction solution, and reacting at 150-200degreesC for 5-12 hours to obtain rod-shaped cellulose nanocrystals with sheet titanium dioxide grown on surface, and (iii) dispersing graphene nanosheets in ethanol, adding rod-shaped cellulose nanocrystals of surface growth sheet titanium dioxide, ultrasonically dispersing, depositing graphene nanosheets on surface of flaky titanium dioxide to obtain composite material.