▎ 摘　　要

NOVELTY - Preparing monoclinic phase bismuth vanadate/graphene oxide (GO)/RGO crystal comprises e.g. (i) dissolving bismuth(III) nitrate pentahydrate in dilute nitric acid, stirring, then adding oleic acid, n-heptane and acetone, sodium hydroxide solution to form precursor solution, drying, (ii) pouring concentrated sulfuric acid into an Erlenmeyer flask, cooling, adding graphite, sodium nitrate and potassium permanganate, heating, drying to obtain flaky graphene graphene oxide, and (iii) dissolving the flaky graphene oxide in aqueous ethanol solution, ultrasonic dispersing and post processing. USE - The method is useful for preparing monoclinic phase bismuth vanadate/graphene oxide (GO)/RGO crystal (claimed). ADVANTAGE - The method has simple operation and stable process, and is preparation method. DETAILED DESCRIPTION - Preparing monoclinic phase bismuth vanadate/graphene oxide (GO)/RGO crystal comprises (i) dissolving A mmol bismuth(III) nitrate pentahydrate in B ml dilute nitric acid, uniformly stirring, then adding into C ml oleic acid, D ml n-heptane and E ml acetone, continuing to stir, then adding F ml sodium hydroxide solution to form precursor solution, stirring the precursor solution at room temperature for 6-10 hours to obtain bismuth(III) oxide, then washing and drying, where ratio of A, B, C, D, E and F is 1:8-10:2.5-3.5:2.5-3.5:9-11:4-6, the concentration of dilute nitric acid is 0.95-1.05 mol/l, the concentration of sodium hydroxide solution is 9-11 mol/l, (ii) pouring M ml of concentrated sulfuric acid into an Erlenmeyer flask, cooling to 0 degrees C and maintaining a constant temperature, under continuous stirring condition, adding X g graphite, Y g sodium nitrate and Z g potassium permanganate, where ratio of M, X, Y and Z is 100-130:5:4-6:12-18, stirring to obtain a mixed solution, heating the mixture to 25 degrees C, stirring and keeping the temperature for 2.5-3.5 hours, heating the mixture to 35 degrees C, stirring and keeping the temperature for 0.5-4 hours, then cooling the mixture to 0 degrees C and constant temperature to 1.5-2.5 hours, adding deionized water and hydrogen peroxide solution to obtain dark brown graphene oxide product, where the volume ratio of mixture, deionized water and hydrogen peroxide solution is 100-130:300-500:50-100, then washing the dark brown graphene oxide product, centrifuging, drying to obtain flaky graphene graphene oxide, (iii) dissolving the flaky graphene oxide in aqueous ethanol solution, ultrasonic dispersion to obtain concentration of 1.8-2.2 g/l graphene oxide suspension, dissolving bismuth(III) oxide in absolute ethanol, then dropwise adding acetic acid until solution becomes white and having concentration of 0.015-0.025 mol/l of bismuth(III) oxide suspension, dissolving ammonium metavanadate in hot deionized water, heating to stir to obtain concentration of 0.035-0.045 mol/l of a clear yellow-brown ammonium metavanadate solution, (iv) mixing ammonium metavanadate solution in bismuth(III) oxide suspension in a molar ratio of bismuth and vanadium of 1:1, homogenizing, then adding graphene oxide suspension, precipitating a bright yellow precipitate, continuing to stir for 30-60 minutes to prepare precursor solution, where mass fraction of graphene oxide in the precursor solution is 15-40%, and (v) pouring the precursor solution into a hydrothermal kettle, carrying out hydrothermal reaction at 180 degrees C for 6-12 hours, cooling the mixture to room temperature, washing the product, and drying to obtain final product.