▎ 摘　　要

NOVELTY - Preparing graphene oxide/(040) crystal plane bismuth vanadate heterojunction comprises dissolving bismuth(III) nitrate pentahydrate in dilute nitric acid, adding ammonium metavanadate, stirring to obtain precursor A, carrying out hydrothermal reaction of precursor liquid A to obtain (040) crystal plane bismuth vanadate, washing the precipitate, drying to obtain (040) crystal plane bismuth vanadate powder, adding prepared (040) bismuth vanadate powder into graphene oxide solution, stirring to form precursor B, carrying out hydro-thermal reaction, cooling, washing the precipitate and drying. USE - The heterojunction is useful for photocatalytic degradation of organic pollutants (claimed). ADVANTAGE - The method combines graphene oxide with excellent conductivity as carrier and (040) crystal face bismuth vanadate powder, graphene oxide nanoscale structure supports bismuth vanadate structure, and it enhances structural stability, provides a channel for electronic transmission, improves the conductivity, so that the catalytic performance of bismuth vanadate is enhanced. DETAILED DESCRIPTION - Preparing graphene oxide/(040) crystal plane bismuth vanadate heterojunction comprises (i) dissolving bismuth(III) nitrate pentahydrate in dilute nitric acid, adding ammonium metavanadate and stirring for 50-80 minutes to obtain precursor A, where the molar ratio of bismuth(III) nitrate pentahydrate and ammonium metavanadate is 1:1, (ii) carrying out hydrothermal reaction of precursor liquid A at 70-90 degrees C for 13-16 hours, to obtain (040) crystal plane bismuth vanadate , washing the precipitate and drying to obtain (040) crystal plane bismuth vanadate powder, (iii) dissolving graphene oxide in ethanol aqueous solution, ultrasonically dispersing and stirring uniformly, then adding dilute nitric acid, ultrasonically dispersing and stirring uniformly, and then adding sodium hydroxide solution, ultrasonic dispersing and stirring uniformly to obtain graphene oxide solution, where the mole ratio of the oxidized graphene to the nitric acid in the added dilute nitric acid and the sodium hydroxide in the sodium hydroxide solution is (0.35-0.7):1:1, and (iv) adding the prepared (040) bismuth vanadate powder into the graphene oxide solution, stirring for 30-60 minutes to form precursor B, and carrying out hydro-thermal reaction of precursor B at 60-90 degrees C for 3-11 hours, cooling to room temperature, and washing the precipitate generated by the reaction and drying.