Titanium dioxide-zinc oxide-chitosan composite film and titanium dioxide immobilized material were prepared by titanium dioxide,and their free radical scavenging effect was studied.Then,the photocatalytic degradation of cypermethrin pesticide was studied by photocatalytic degradation of cypermethrin pesticide.The results showed that at 4℃,the scavenging rate of free radicals by TiO2 and ZnO mixed materials was 58.72%.The cabbage samples were treated with titanium dioxide-zinc oxide-chitosan composite film,and the degradation rate of cypermethrin was 40.78%by photocatalytic degradation.
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