▎ 摘　　要

NOVELTY - A two-dimensional layered composite nanophotocatalyst material is a stack of two-dimensional layered structures comprising 5-20 wt.% graphene and 5-20 wt.% carbonitride as stable strengthening phases, and remaining bismuth oxybromide as substrate material. USE - Two-dimensional layered composite nanophotocatalyst material for purifying organic pollutants e.g. tetracycline in industrial wastewater (claimed), photocatalysis, gas sensing and sewage treatment. ADVANTAGE - The two-dimensional layered composite nanophotocatalyst material has high photocatalytic activity and degradation efficiency of more than 60% with respect to pollutants including tetracycline, and can be prepared industrially. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for manufacture of two-dimensional layered composite nanophotocatalyst material, which involves adding graphene, urea, bismuth nitrate and sodium chloride to a reaction crucible, preparing bismuth oxide-doped graphene/carbonitride composite layered material by the molten salt method, adding the resulting precursor to deionized water, adding surfactant and potassium bromide solution, dispersing, mixing, hydrothermally reacting, washing and drying.