▎ 摘　　要

NOVELTY - Flexible graphene oxide composite fiber catalyst preparation involves adopting phosphoric acid intercalation method to pre-oxidize graphite powder, and then stirring and mixing graphite oxide powder, sodium nitrate and concentrated sulfuric acid in a mass ratio of 0.2-2:0.2-2:20-120 at 0-5 degrees C. The potassium permanganate is added in the formed mixture with stirring for 10-100 minutes, where 30-200 ml deionized water is added at 70-100 degrees C for 10-100 minutes, and then cooled and washed with ionized water and hydrogen peroxide solution to obtain graphene oxide solution. The washed product is subjected to static precipitation and dialysis purification treatment for 2-10 days to obtain a high-purity graphene oxide solution. USE - Method for preparing flexible graphene oxide composite fiber catalyst for catalyzing p-nitrophenol. ADVANTAGE - The method prepares the flexible graphene oxide composite fiber in a simple, cost-effective and eco-friendly manner with improved catalytic efficiency, high stability and biocompatibility, and provides easy recovery, convenient operation, and broad application prospects in different fields such as medicine, pesticides and dyes. DETAILED DESCRIPTION - Flexible graphene oxide composite fiber catalyst preparation involves adopting phosphoric acid intercalation method to pre-oxidize graphite powder, and then stirring and mixing graphite oxide powder, sodium nitrate and concentrated sulfuric acid in a mass ratio of 0.2-2:0.2-2:20-120 at 0-5 degrees C. The potassium permanganate is added in the formed mixture with stirring for 10-100 minutes, where 30-200 ml deionized water is added at 70-100 degrees C for 10-100 minutes, and then cooled and washed with ionized water and hydrogen peroxide solution to obtain graphene oxide solution. The washed product is subjected to static precipitation and dialysis purification treatment for 2-10 days to obtain a high-purity graphene oxide solution. 1-15 ml 20-200 mM cetyltrimethylammonium bromide (CTAB) aqueous solution is heated at 20-50 degrees C in a water bath under stirring for 3-30 minutes, and then mixed with 0.1-1 ml 4-50 mM chloroauric acid solution and 0.3-0.6 ml 10-200 mM sodium borohydride aqueous solution under stirring for 3-30 minutes to obtain a gold seed solution. 10-100 ml 0.05-0.2M cetyltrimethylammonium bromide aqueous solution is heated in a water bath at 20-50 degrees C under stirring for 3-30 minutes, and then mixed with 0.5-5 ml 0.1-50mM chloroauric acid aqueous solution, 0.1-10 ml 0.5-5mM silver nitrate aqueous solution and 0.1-10ml 50-500mM L-ascorbic acid aqueous solution under stirring for 5-50 minutes to prepare gold silver nitrate aqueous solution. The prepared gold silver nitrate aqueous solution is centrifuged at a centrifugal speed of 8000-12000 revolutions per minute to remove free CTAB, and then performed electrostatic adsorption to obtain graphene oxide doped material solution. The obtained solution is centrifuged and concentrated to prepare a wet spinning solution, where a micro syringe pump is used to wet-spin the calcium chloride-isopropanol aqueous solution as spinning coagulation bath to obtain the graphene oxide composite fiber catalyst. An INDEPENDENT CLAIM is included for a method for preparing graphene oxide composite fiber catalyst, which involves: (A) washing graphene oxide composite fiber catalyst with ethanol solution for 3-7 times; (B) drying in an oven at 40-90 degrees C for 12-24 hours; (C) catalyzing reduction reaction by mixing p-nitrophenol solution and sodium borohydride solution; and (D) filtering the reaction solution to obtain the flexible composite fiber catalyst.