▎ 摘　　要

NOVELTY - Preparing hetero-poly-acid/graphene oxide composite material comprises e.g. dissolving sodium tungstate in water, using diluted hydrochloric acid to adjust pH value to 4.5-6, adding sodium dihydrogen phosphate, heating at 80-90 degrees C, constant temperature stirring for 0.8-1.2 hours, filtering, taking potassium chloride, adding filtrate after stirring and dissolving, cooling for separating out crystal, filtering and drying to obtain the heteropoly acid, where solid-liquid ratio of the sodium tungstate to boiling water is 7-12 g:50ml, and dissolving heteropoly acid into distilled water. USE - The material is useful for industrial dye waste water treatment (claimed). ADVANTAGE - The material: is loaded on the carrier, which not only can greatly improve the specific surface area; has good catalytic performance; and improves the repeatability. DETAILED DESCRIPTION - Preparing hetero-poly-acid/graphene oxide composite material comprises (a) dissolving sodium tungstate in water, using diluted hydrochloric acid to adjust pH value to 4.5-6, adding sodium dihydrogen phosphate, heating at 80-90 degrees C, constant temperature stirring for 0.8-1.2 hours, filtering, taking potassium chloride, adding filtrate after stirring and dissolving, cooling for separating out crystal, filtering and drying to obtain the heteropoly acid, where solid-liquid ratio of the sodium tungstate to boiling water is 7-12 g:50ml, (b) dissolving heteropoly acid into distilled water to obtain solution A, sodium tungstate, sodium dihydrogen phosphate with the mass ratio of potassium chloride is 40-50:5-10:10, dissolving graphene oxide into deionized water to prepare a mass volume concentration of 1-3g/l in the solution B, mixing the solution A and solution B respectively ultrasonic for 0.3-0.8 hours and stirring for 18-24 hours, drying to obtain the heteropoly acid/graphene oxide composite material, where the heteropoly acid and oxidized grapheme with mass ratio of 10-90:1.