▎ 摘　　要

NOVELTY - Composite catalyst comprises gold (Au) and Graphene oxide/carbon nanotube (GO/CNT) at mass ratio of 1:2-1:19. The mass ratio of GO and CNT is 0 or 1:0-5. USE - Composite catalyst used for catalytic reduction of aromatic nitro compound, particularly 4-nitrophenol (claimed). ADVANTAGE - The catalyst has high reduction rate, stability, and simple recovery. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) preparation of composite catalyst comprising taking GO, adding solvent, preparing into 0.1-3 mg/ml GO sol-gel, where solvent is preferably water; taking CNT, adding N-methyl pyrrolidone, preparing into 0.1-3 mg/ml CNT suspension; mixing sol-gel and suspension, uniformly stirring to obtain mixed solution; adding chloroauric acid tetrahydrate aqueous solution while stirring for 25 minutes, uniformly stirring to obtain mixed solution; dropping aqueous solution of sodium borohydride, reacting at room temperature for 2-5 hours, preferably 3 hours, filtering, and washing; and (2) catalytic reduction of aromatic nitro compound, particularly 4-nitrophenol comprising reacting nitro aromatic compound and composite catalyst in the presence sodium borohydride (NaBH4) at 0-30 degrees C for 3-90 minutes by dissolving prepared composite non-film catalyst and 4-nitrophenol with water, uniformly stirring to obtain mixed solution; adding NaBH4 water solution; or dissolving 4-nitrophenol with water; adding NaBH4 water solution; and reacting with composite catalyst thin film; where molar ratio of nitro aromatic compound and composite catalyst is 1:0.01-0.05 and the molar ratio of aromatic nitro compounds and NaBH4 is 1:50-100.