▎ 摘　　要

NOVELTY - An activated carbon is prepared by: (S1) assembling and crosslinking by dissolving polystyrene-b-polyoxyethylene block polymer in tetrahydrofuran to obtain a solution (A), adding aqueous ethanol solution to obtain a solution (B), stirring, adding deionized water and adding 2,6-pyridinediamine, stirring, reacting, adding graphene oxide aqueous solution to solution (B) to obtain a solution (C), stirring, leaving still, adding ammonium peroxodisulfate solution to solution (C) to obtain a solution (D), stirring the solution (D), centrifuging, washing the precipitate with the ethanol aqueous solution, and centrifugally dispersing in the ethanol aqueous solution to prepare microsphere solution; (S2) preparing pre-carbonized products made of straw or fruit shell; (S3) loading and calcining by immersing the pre-carbonized products in the microsphere solution, stirring, leaving still, filtering out, washing, air drying, heating, and cooling to obtain carbonized products; and (S4) activating. USE - The activated carbon is useful for synthesizing glyphosate by catalytic oxidation. ADVANTAGE - The activated carbon adopts polymer microspheres, which are carbonized and loaded on the surface of the carbonized product to provide basic pyridine nitrogen active sites for the catalytic oxidation of glyphosate, promote the oxidation reaction of glyphosate and improve the catalytic oxidation performance of activated carbon. DETAILED DESCRIPTION - An activated carbon is prepared by: (S1) assembling and crosslinking by dissolving 10 pts. wt. polystyrene-b-polyoxyethylene block polymer in tetrahydrofuran to obtain a solution (A), adding 3 times aqueous ethanol solution to obtain a solution (B), vigorously stirring at 800 rpm for 10 minutes, quickly adding the same volume of deionized water as solution (B), then adding 8 pts. wt. 2,6-pyridinediamine, stirring and reacting for 60 minutes, adding 4 vol.% 2 g/l graphene oxide aqueous solution to solution (B) to obtain a solution (C), uniformly stirring, leaving still for 10 minutes, adding 1 vol.% 0.3 g/ml ammonium peroxodisulfate solution to solution (C) to obtain a solution (D), stirring the solution (D) at 0-5 degrees C for 4 hours, centrifuging at 8000 rpm for 3 minutes, washing the precipitate with the ethanol aqueous solution, and centrifugally dispersing in the ethanol aqueous solution to prepare 10 g/l microsphere solution; (S2) pre-carbonizing shell by drying straw or fruit shell to a constant weight, crushing, quickly heating the straw at 10-20 degrees C/minute to 1000 degrees C under a protective atmosphere of nitrogen or argon, maintaining the temperature for 20 minutes to pyrolyze, adding the prepared product to hydrochloric acid solution to soak, removing excess impurities, and washing with deionized water to obtain pre-carbonized products; (S3) loading and calcining by immersing the pre-carbonized products in the microsphere solution, uniformly stirring, leaving still overnight, filtering out, washing with ethanol solution, air drying 60 degrees C for 12 hours, gradually heating from room temperature to 350 degrees C at a heating rate of 2 degrees C/minute, heat-preserving under nitrogen atmosphere for 3 hours, then increasing the temperature to 700 degrees C at a heating rate of 2 degrees C/minute, heat-preserving for 1 hour, and cooling to obtain carbonized products; and (S4) activating by soaking the carbonized product in an activator comprising a mixed aqueous solution of sodium hydroxide, potassium hydroxide and sodium bicarbonate for 6-18 hours, filtering out, washing with deionized water, drying, heating at 200-250 degrees C in air, heat-preserving for 20-40 minutes, switching the atmosphere to nitrogen or argon, then heating at 550 degrees C for calcination, introducing 0.1 g/minute water vapor into per gram of carbonized product, and calcining for 1-2 hours.