▎ 摘　　要

NOVELTY - Pyrrole copolymer grafted porous graphene adsorbent is prepared by (i) adding graphene oxide to deionized water, dispersing, adding polystyrene microspheres, stirring, freezing, drying to obtain graphene oxide/polystyrene microsphere composite, and performing heat treatment to obtain porous graphene, (ii) adding porous graphene to mixed acid, dispersing, adding deionized water to dilute, filtering, washing and drying to obtain carboxylated graphene, (iii) adding sodium hydroxide and tetrabutylammonium hydrogen sulfate to acetonitrile, dispersing, adding pyrrole and 3-chloropropylamine hydrochloride, reacting, extracting, purifying and drying to obtain 1-(2-aminoethyl)pyrrolidine, and (iv) adding carboxylated graphene to anhydrous N,N-dimethylformamide, ultrasonically dispersing, adding thionyl chloride, placing in ice bath, stirring, distilling, adding 1-(2-aminoethyl)pyrrolidine and pyrrole, stirring, adding ferric chloride, washing, filtering and drying to obtain the product. USE - As pyrrole copolymer grafted porous graphene adsorbent. ADVANTAGE - The method improves the pore structure of graphene oxide, increases the specific surface area, increases the number of amino groups on the pyrrole monomer, improves the adsorption performance and adsorbs a large amount of chromium hexavalent ion, and reduces chromium hexavalent ion by electrons to the less toxic chromium(III) ion. DETAILED DESCRIPTION - Pyrrole copolymer grafted porous graphene adsorbent is prepared by (i) adding graphene oxide to deionized water, ultrasonically dispersing, adding polystyrene microspheres, stirring for 2-6 hours in a magnetic stirring device, quickly freezing in a liquid nitrogen atmosphere, drying to obtain graphene oxide/polystyrene microsphere composite, putting in a tube furnace, and performing heat treatment at 480-550 degrees C for 1-3 hours in a nitrogen atmosphere to obtain porous graphene, (ii) adding porous graphene to mixed acid, ultrasonically dispersing, stirring at 60-80 degrees C for 6-18 hours, adding deionized water to dilute, leaving still for 12-36 hours, filtering, washing and drying to obtain carboxylated graphene, (iii) adding sodium hydroxide and tetrabutylammonium hydrogen sulfate in a ratio of 100:(1-3) to acetonitrile, ultrasonically dispersing, adding pyrrole and 3-chloropropylamine hydrochloride in a ratio of 100:(80-120), reacting under nitrogen atmosphere at 70-90 degrees C for 12-36 hours, extracting, purifying and drying to obtain 1-(2-aminoethyl)pyrrolidine, and (iv) adding carboxylated graphene to anhydrous N,N-dimethylformamide, ultrasonically dispersing, adding thionyl chloride, placing in an ice bath, stirring for 1-3 hours, distilling under reduced pressure to remove thionyl chloride, adding 1-(2-aminoethyl)pyrrolidine and pyrrole, stirring at 0-5 degrees C for 20-40 minutes, adding ferric chloride, continuing to stir at -5 to 5 degrees C for 4-8 hours, washing, filtering and drying to obtain the product.