▎ 摘　　要

NOVELTY - In-situ synthesis of bismuth oxychloride carbon-based composite, involves dissolving a bismuth source in an alcohol solution, adding a carbon material, ultrasonically dispersing to obtain a dispersion, dissolving vitamin B1 hydrochloride in water, dripping in the dispersion while stirring, reacting, washing, and drying. USE - Synthesis of bismuth oxychloride carbon-based composite useful as photocatalyst for decomposing dyes e.g. methyl orange, rhodamine B, and methylene blue in water, and volatile organic compounds e.g. formaldehyde, toluene, benzene and xylene in gas (all claimed). ADVANTAGE - The method does not use an acid, alkali or surfactant, is a simple liquid-phase synthesis, and provides composite with uniform petal-shaped structure, which can effectively catalyze decomposition of dye and volatile organic compounds under visible light condition, and has activity, which is almost not changed even after use for several times. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for use of the composite as visible light photocatalyst, which involves adding the composite to water with a dye concentration of 15-150 mg/L or gas with a volatile organic compound concentration of 10-100 mg/L, at room temperature, and reacting for 0.1-12 hours.