▎ 摘　　要

NOVELTY - The preparation of photocatalyst involves preparing a colloidal suspension of graphene oxide, centrifuging and dispersing, hydrothermally treating potassium hydroxide, niobium pentoxide and deionized water to obtain potassium niobate nanowires, mixing lithium nitrate powder material and potassium niobate nanowires with water, adding lithium nitrate solution to potassium niobate graphene oxide colloid suspension, dispersing, stirring, obtaining nano lithium niobate and graphene oxide composite, heating, obtaining nano lithium niobate-graphene composite and drying. USE - Preparation of nano lithium niobate-graphene composite photocatalyst (claimed). ADVANTAGE - The method prepares the photocatalyst by simple process and convenient operation, and ensures practical and effective implementation in short period. DETAILED DESCRIPTION - The preparation method of nano lithium niobate-graphene composite photocatalyst involves preparing a colloidal suspension of graphene oxide by using graphite powder as raw material, preparing graphene oxide by hummers, washing graphene oxide with distilled water, centrifuging and ultrasonically dispersing the centrifuged graphene oxide in distilled water, providing 38.7 wt.% potassium hydroxide, 0.4 wt.% niobium pentoxide and 60.9 wt.% deionized water, hydrothermally treating the material to obtain potassium niobate nanowires, adding lithium nitrate powder material and potassium niobate nanowires in a molar ratio of 6:1 to deionized water, mixing, forming lithium nitrate solution, adding colloidal suspension of graphene oxide to the solution, ultrasonically dispersing for 10-20 minutes, slowly adding the solution to potassium niobate-graphene oxide colloidal suspension, ultrasonically dispersing, stirring for 10-20 minutes, obtaining nano lithium niobate and graphene oxide composite, placing nano lithium niobate and graphene oxide composite in microwave reactor, heating at 70 degrees C for 40-60 minutes, obtaining nano lithium niobate-graphene composite, centrifuging nano lithium niobate-graphene composite, washing with distilled water twice, drying, and producing the final product of nano lithium niobate-graphene photocatalyst.