▎ 摘　　要

NOVELTY - An heterojunction composite material comprises graphene-carbonitride/titania/nickel-iron-layered double hydroxide hetero-junction composite material which is prepared from a hydrotalcite precursor aqueous solution, graphene-carbonitride nanosheets and titanium oxide in a high temperature environment. USE - Heterojunction composite material used for reduction of carbon dioxide to carbon monoxide under photocatalysis (claimed). ADVANTAGE - The heterojunction composite material has excellent photocatalytic stability, improved photocatalytic carbon dioxide reduction reaction, and improved carbon monoxide yield of 161.79 micromol/g. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for use of the heterojunction composite material for reduction of carbon dioxide to carbon monoxide under photocatalysis.