▎ 摘　　要

NOVELTY - Preparing PVP (polyvinylpyrrolidone) modified graphene-supported BiOCl (bismuth oxychloride) photocatalyst involves weighing raw materials, dissolving cerium nitrate in ethylene glycol, and stirring uniformly to obtain a cerium nitrate solution with 0.1-0.2 mmol/mL molar concentration, dissolving potassium chloride and citric acid in a mixture of ethanol and water, stirring uniformly to obtain a mixture A, where taking potassium chloride, citric acid, and mixture of ethanol and water in (3-4) mmol:(1-2) mmol:(20-22) mL ratio, mixing ruthenium nitrate solution and mixture A to obtain reaction solution, where mixture A having Bi3/+ ion and Cl/- ion in 1:1 ratio, placing the reaction solution in an autoclave, reacting under 2-4 MPa pressure at 100-150 degrees C temperature for 10-15 hours to obtain a mixture containing BiOCl, centrifuging, washing and drying to obtain BiOCl, and dispersing the graphene in mixture of deionized water and absolute ethanol. USE - Method used for preparing PVP (polyvinylpyrrolidone) modified graphene-supported BiOCl (bismuth oxychloride) photocatalyst (claimed). ADVANTAGE - The method offers PVP modified graphene supported BiOCl photocatalyst, which can suppress electron holepairs recombination of changing BiOCl aggregation phenomenon and improves the light catalysis efficiency. The degradation of methyl orange in the PVP modified graphene-loaded BiOCl photocatalyst has /)98.7% photocatalytic efficiency. DETAILED DESCRIPTION - Preparing PVP (polyvinylpyrrolidone) modified graphene-supported BiOCl (bismuth oxychloride) photocatalyst involves weighing raw materials, dissolving cerium nitrate in ethylene glycol, and stirring uniformly to obtain a cerium nitrate solution with 0.1-0.2 mmol/mL molar concentration, dissolving potassium chloride and citric acid in a mixture of ethanol and water, stirring uniformly to obtain a mixture A, where taking potassium chloride, citric acid, and mixture of ethanol and water in (3-4) mmol:(1-2) mmol:(20-22) mL ratio, mixing ruthenium nitrate solution and mixture A to obtain reaction solution, where mixture A having Bi3/+ ion and Cl/- ion in 1:1 ratio, placing the reaction solution in an autoclave, reacting under 2-4 MPa pressure at 100-150 degrees C temperature for 10-15 hours to obtain a mixture containing BiOCl, centrifuging, washing and drying to obtain BiOCl, dispersing the graphene in mixture of deionized water and absolute ethanol, and ultrasonically dispersing to obtain a graphene solution having 0.2-0.4 mg/mL molar concentration, mixing BiOCl, PVP and graphene solution in (15-100):1:(0-60) ratio, stirring uniformly to obtain a mixed solution B, placing in an autoclave, and reacting at 140-180 degrees C temperature for 1-5 hours under 3-4 MPa to obtain a mixture containing graphene-supported BiOCl, centrifuging, washing, and drying to obtain a PVP-modified graphene-supported BiOCl photocatalyst. An INDEPENDENT CLAIM is included for a PVP-modified graphene-supported BiOCl photocatalyst, which comprises graphene and BiOCl, and the BiOCl nanosheet distributed on the surface of graphene.