▎ 摘　　要

NOVELTY - Preparing graphene quantum dot (GQDs)/tungsten trioxide dihydrate ultra-thin nano composite photocatalyst comprises providing 20-40 mg tungsten trioxide dihydrate block powder, adding to 15 ml 1-2 mg/ml GQDs solution in mass ratio of 4:3 respectively, carrying out ultrasonic treatment for 3-5 hours, centrifuging at 10000 revolutions/minute for 10 minutes, removing supernatant, adding distilled water (required amount), centrifuging at 3000 revolutions/minute for 10 minutes, freezing, drying supernatant, obtaining GQDs/tungsten trioxide dihydrate nano composite photocatalyst. USE - The method is useful for preparing graphene quantum dot (GQDs)/tungsten trioxide dihydrate ultra-thin nano composite photocatalyst (claimed). ADVANTAGE - The method: has simple technical condition; and strong operability. The photocatalyst can generate great current and has high light catalytic activity.