▎ 摘　　要

NOVELTY - A nanocomposite photocatalyst comprises graphene oxide, bismuth salt, bromine source and chlorine. USE - Nanocomposite photocatalyst. ADVANTAGE - The photocatalyst has high UV and visible light catalytic activity. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of nanocomposite photocatalyst comprising dispersing graphene oxide into organic solvent to obtain 0.1-0.3 g/L dispersed graphene oxide, dissolving bismuth (III) nitrate pentahydrate in bromine-containing source to obtain solution A, dissolving chlorine source in ethylene glycol, stirring for 30 minutes, adding dispersed graphene oxide and solution A, ultrasonically mixing at 160-200 degrees C for 12-24 hours into PTFE lining stainless steel reactor, cooling, washing with deionized water, and drying.