▎ 摘　　要

NOVELTY - Preparing silver-bismuth photocatalyst comprises (i) adding concentrated sulfuric acid and concentrated nitric acid mixed acid to graphene at 85-100 degrees C, reacting for 2-8 hours, filtering, washing and drying to obtain modified graphene, (ii) adding silver nitrate, bismuth nitrate dissolved in anhydrous ethanol, the concentration of silver nitrate in the mixed solution of silver and bismuth nitrate is 0.3-1 mol/l, mixing the modified graphene prepared in (i) to the silver nitrate and bismuth nitrate mixed solution. USE - The method is useful for preparing silver-bismuth photocatalyst loaded with graphene having tetrahydron structure (claimed). DETAILED DESCRIPTION - Preparing silver-bismuth photocatalyst comprises (i) adding concentrated sulfuric acid and concentrated nitric acid mixed acid to graphene at 85-100 degrees C, the ratio of graphene and mixed acid is 0.5-2:1, reacting for 2-8 hours, filtering, washing and drying to obtain modified graphene, (ii) adding silver nitrate, bismuth nitrate dissolved in anhydrous ethanol, the concentration of silver nitrate in the mixed solution of silver and bismuth nitrate is 0.3-1 mol/l, mixing the modified graphene prepared in (i) to the silver nitrate and bismuth nitrate mixed solution in the ratio of 20ml-1g: 30ml, ultrasonic dispersing for 1-2 hours to obtain solution A, (iii) dissolving sodium hydroxide in 70-75% ethanol to obtain solution B, the sodium hydroxide concentration is 1.5-2 mol/l, (iv) stirring, mixing B liquid droplets into the A solution to obtain solution C, the molar ratio of sodium hydroxide in B solution and silver nitrate in solution A is 2-4:1, adding cetrimonium bromide and serine, stirring and transferring to the reactor at 180-200 degrees C, hydrothermal reacting for 2-4 hours, filtering, washing and drying to obtain the product.