▎ 摘　　要

NOVELTY - An efficient visible light catalyst contains 5-15 mass% substance (A) and bismuth tungstate (Bi2WO6) microsphere in which substance (A) is graphene oxide or graphene and Bi2WO6 microsphere is prepared by dissolving sodium tungstate dihydrate (Na2WO4.2H2O) solid in deionized water, ultrasonically stirring for 5-10 minutes to obtain uniform Na2WO4 solution, dissolving bismuth nitrate pentahydrate (Bi(NO3)3.5H2O) solid in ethylene glycol, ultrasonically stirring for 5-10 minutes to obtain Bi(NO3)3 solution, and mixing Na2WO4 solution and Bi(NO3)3-ethylene glycol solution. USE - An efficient visible light catalyst (claimed). ADVANTAGE - Catalyst is environment-friendly, and has increased dye absorbing ability, enhanced photo-induced carrier separation efficiency, improved photocatalytic activity, and high stability, and preparation method is simple and low in cost. DETAILED DESCRIPTION - An efficient visible light catalyst contains 5-15 mass% substance (A) and bismuth tungstate (Bi2WO6) microsphere in which substance (A) is graphene oxide or graphene and Bi2WO6 microsphere is prepared by dissolving sodium tungstate dihydrate (Na2WO4.2H2O) solid in deionized water, ultrasonically stirring for 5-10 minutes to obtain uniform Na2WO4 solution in which volume ratio of Na2WO4.2H2O solid and deionized water is 1-1.5 mmol:40 ml, dissolving bismuth nitrate pentahydrate (Bi(NO3)3.5H2O) solid in ethylene glycol, ultrasonically stirring for 5-10 minutes to obtain uniform Bi(NO3)3 solution in which volume ratio of Bi(NO3)3.5H2O solid and ethylene glycol is 2-3 mmol:40 ml, mixing Na2WO4 solution and Bi(NO3)3-ethylene glycol solution, stirring for 2-3 hours to obtain mixed liquid (A) in which volume ratio Bi(NO3)3 solution:Na2WO4 solution is 0.5-1.5:1, adding mixed liquid (A) in reaction container, reacting at 170-180 degrees C for 20-25 hours, taking out, cooling to room temperature to obtain solid substance, and centrifuging and alternately washing 4-5 times in which 1 centrifugation and alternate washing is performed by centrifuging and washing solid substance using anhydrous ethanol, and centrifuging and washing solid substance using deionized water. An INDEPENDENT CLAIM is included for preparation of efficient visible light catalyst which involves dissolving Na2WO4.2H2O solid in deionized water, ultrasonically stirring for 5-10 minutes to obtain uniform Na2WO4 solution in which volume ratio of Na2WO4.2H2O solid and deionized water is 1-1.5 mmol:40 ml, dissolving Bi(NO3)3.5H2O solid in ethylene glycol, ultrasonically stirring for 5-10 minutes to obtain uniform Bi(NO3)3 solution in which volume ratio of Bi(NO3)3.5H2O solid and ethylene glycol is 2-3 mmol:40 ml, mixing Na2WO4 solution and Bi(NO3)3-ethylene glycol solution, stirring for 2-3 hours to obtain mixed liquid (A) in which volume ratio Bi(NO3)3 solution:Na2WO4 solution is 0.5-1.5:1, adding mixed liquid (A) in reaction container, reacting at 170-180 degrees C for 20-25 hours, taking out, cooling to room temperature to obtain solid substance, centrifuging and alternately washing 4-5 times to obtain Bi2WO6 microsphere in which 1 centrifugation and alternate washing is performed by centrifuging and washing solid substance using anhydrous ethanol, and centrifuging and washing solid substance using deionized water, drying Bi2WO6 microsphere at 40-50 degrees C for 10-24 hours to obtain dried Bi2WO6, dissolving in deionized water, ultrasonically mixing for 30-40 minutes to obtain Bi2WO6 microsphere solution in which mass-to-volume (g:ml) ratio dried Bi2WO6:deionized water is 0.1-0.15:100, dissolving graphene oxide in deionized water, uniformly mixing to obtain graphene oxide solution in which mass-to-volume (g:ml) ratio graphene oxide:deionized water is 0.005-0.015:100, adding Bi2WO6 microsphere solution, ultrasonically mixing for 1-2 hours to obtain mixed liquid (B), and freezing in liquid nitrogen to obtain graphene oxide/Bi2WO6 composite material. DESCRIPTION OF DRAWING(S) - The drawing shows a transmission electron microscope image of a graphene oxide/bismuth tungstate composite material.