▎ 摘　　要

NOVELTY - Preparing bismuth vanadate of carbon nitride/graphene/(040) crystal, involves dissolving bismuth nitrate penta hydrate in dilute nitric acid and subjected to hydrothermal reaction for 13-16 hours. The mole ratio of bismuth nitrate penta hydrate to ammonium metavanadate is 1:1. The first precursor liquid is heated at 70-90 degrees C for 50-80 minutes to obtain (040) crystal layer bismuth vanadate precipitate. The precipitate is washed and dried to obtain (040) bismuth vanadate powder. USE - Method for preparing bismuth vanadate of carbon nitride/graphene/(040) crystal for photocatalytic degradation of organic contamination (claimed). ADVANTAGE - The method enables to prepare bismuth vanadate of carbon nitride/graphene/(040) crystal improves the (040) crystal face bismuth vanadate light catalytic performance. DETAILED DESCRIPTION - Preparing bismuth vanadate of carbon nitride/graphene/(040) crystal, involves dissolving bismuth nitrate penta hydrate in dilute nitric acid and subjected to hydrothermal reaction for 13-16 hours. The mole ratio of bismuth nitrate penta hydrate to ammonium metavanadate is 1:1. The first precursor liquid is heated at 70-90 degrees C for 50-80 minutes to obtain (040) crystal layer bismuth vanadate precipitate. The precipitate is washed and dried to obtain (040) bismuth vanadate powder. The graphene oxide is dissolved in 40-60vol.% of ethanol and subjected to ultrasonic dispersion and stirred uniformly. Dilute nitric acid is added and dispersed ultrasonically. Sodium hydroxide solution is added and dispersed ultrasonically to obtain graphene oxide solution, where the mole ratio of graphene, nitric acid and sodium hydroxide solution is (0.35-0.7):1:1. The prepared (040) crystal plane bismuth vanadate powder is placed into the graphene oxide solution, and stirred for 30-60minutes to form the second precursor solution. The second precursor solution is subjected to hydrothermal reaction at the 150-180 degrees C for 80-120minutes to obtain reduced graphene oxide/(040) crystal surface bismuth vanadate precipitation. The precipitated is washed and dried to obtain reduced graphene oxide/(040) crystal surface bismuth vanadate powder. The mole ratio of (040) crystal face bismuth vanadate powder and graphene oxide in the graphene oxide solution is (3-5):1. The urea is added and the mixture is calcined to 530-580 degrees C for 2-4hours to obtain graphene carbon nitride powder. The prepared graphene carbon nitride powder is dissolved in deionized water. The prepared reduced graphene oxide/(040) crystal surface bismuth vanadate powder is added into the graphene carbon nitride powder solution in a mass ratio of (2-8):(8-2) and stirred for 30-60 minutes to obtain the third precursor liquid. The third precursor liquid is subjected to ultrasonic reaction at room temperature. The precipitate formed by the reaction is washed and dried to obtain a carbonitride/graphene/(040) plane vanadyl vanadate heterojunction.