▎ 摘　　要

NOVELTY - Preparing bismuth silicon oxide (Bi12SiO20)- bismuth oxide silicate (Bi2O2SiO3)/reduced graphene oxide photocatalyst, comprises (i) taking 0.4-0.6 g graphite powder and 98 wt.% concentrated sulfuric acid in mass ratio 1:70-1:90, mixing, stirring for 30-50 minutes, adding 3-5 g mixture of potassium permanganate and sodium nitrate, stirring, heating, and continue to stirring for 2-2.5 hours to obtain uniform mixed solution, (ii) preparing graphene oxide suspension, (iii) mixing absolute ethanol and deionized water in a volume ratio 1.6:1-2:1, adding 0.005 to 0.008mol/l citric acid into it, dissolving, adding 0.004-0.008 mol/l bismuth nitrate, and stirring until the solution is completely dissolved, taking ethyl orthosilicate based on the mass ratio between silicon and bismuth is 5:1-7:1, adding 1.8-2.5 g polyethylene glycol, and stirring until completely dissolved to obtain precursor solution, (iv) drying, and calcining, and (v) hydrothermally heating. USE - The method is useful for preparing bismuth silicon oxide (Bi12SiO20)- bismuth oxide silicate (Bi2O2SiO3)/reduced graphene oxide photocatalyst. ADVANTAGE - The method: ensures the obtained product has high specific surface area, can effectively adsorb organic solvents, is easy to recycle, and does not generate secondary pollution; is simple; adopts simple equipment, and has short production time. DETAILED DESCRIPTION - Preparing bismuth silicon oxide (Bi12SiO20)- bismuth oxide silicate (Bi2O2SiO3)/reduced graphene oxide photocatalyst, comprises (i) taking 0.4-0.6 g graphite powder and 98 wt.% concentrated sulfuric acid in mass ratio 1:70-1:90, mixing, stirring for 30-50 minutes, adding 3-5 g mixture of potassium permanganate and sodium nitrate in a mass ratio of 5.5:1-7:1, placing it in an ice water bath, stirring for 2-2.5 hours, placing it in a water bath at 30-40 degrees C, stirring for 2-2.5 hours, adding 130-150 ml water into it, heating the water bath at 90-100 degrees C, continue to stirring for 2-2.5 hours to obtain uniform mixed solution, (ii) adding 1-3 ml 30 wt.% hydrogen peroxide solution into the mixed solution dropwise, washing with deionized water and drying at 60-65 degrees C to obtain graphene oxide, and adding graphene oxide to deionized water to obtain graphene oxide suspension, (iii) mixing absolute ethanol and deionized water in a volume ratio 1.6:1-2:1, adding 0.005 to 0.008mol/l citric acid into it, dissolving, adding 0.004-0.008 mol/l bismuth nitrate, and stirring until the solution is completely dissolved, taking ethyl orthosilicate based on the mass ratio between silicon and bismuth is 5:1-7:1, and dissolving it in the above solution until it is fully dissolved, adding 1.8-2.5 g polyethylene glycol, stirring until completely dissolved to obtain precursor solution, (iv) placing the precursor solution in a water bath, reacting in a water bath at 85-90 degrees C for 3-4 hours, drying at 150-160 degrees C for 7-10 hours to obtain Bi12SiO20-Bi2O2SiO3 xerogel, calcining it at 600-650 degrees C for 2-5 hours to obtain Bi12SiO20-Bi2O2SiO3 composite powder, (v) taking 0.02-0.05 g Bi12SiO20-Bi2O2SiO3 composite powder and adding it into the graphene oxide suspension, the concentration ratio between Bi12SiO20-Bi2O2SiO3 composite powder and graphene oxide is 8-12:1, stirring and mixing in an ice water bath, ultrasonic treating for 4-6 hours, adding 100-200 mg L-ascorbic acid based on the mass ratio between L-ascorbic acid and graphene oxide of 1/5-1/10, and ultrasonically mixing for 10-12 hours to obtain suspension, and (vi), hydrothermally heating the suspension at 95-100 degrees C to obtain final product.