▎ 摘　　要

NOVELTY - Preparing tinbismuth/graphene composite visible photocatalyst comprises e.g. dissolving bismuth nitrate pentahydrate in 20 ml concentration is 4 mmol/l nitric acid solution, adding 2 mmol tin grain into solution, stirring to dissolving marked as solution X, dissolving 0.3 g graphene oxide in 20 mL ethanol to obtain yellow clear solution Y, stirring, adding the solution Y in the solution X, continuously stirring for 30 minutes, mol concentration is 2 mol/l sodium hydroxide solution adjusting pH of system is 12, and maintaining the pH is stable, continuously stirring for 2 hours. USE - The photocatalyst is useful for degradation of refractory biodegradable dye waste water. ADVANTAGE - The photocatalyst has wide absorption spectrum range, stable performance, non-toxic, and cheap. DETAILED DESCRIPTION - Preparing tinbismuth/graphene composite visible photocatalyst comprises (i) dissolving bismuth nitrate pentahydrate in 20 ml concentration is 4 mmol/l nitric acid solution, adding 2 mmol tin grain into solution, stirring to dissolving marked as solution X, (ii) dissolving 0.3 g graphene oxide in 20 ml ethanol to obtain yellow clear solution Y, (iii) stirring, adding the solution Y in the solution X, continuously stirring for 30 minutes, mol concentration is 2 mol/l sodium hydroxide solution adjusting pH of system is 12, and (iv) maintaining the pH is stable, continuously stirring for 2 hours, transferring to reaction kettle to 180 degrees C to react for 24 hours, centrifugally separating, washing three times each with water and ethanol, freezing and drying to obtain the tin bismuth/graphene composite visible photocatalyst.