▎ 摘　　要

NOVELTY - Purification agent comprises 32-46 pts. wt. graphene, 23-34 pts. wt. sepiolite, 21-29 pts. wt. gypsum powder, 14-21 pts. wt. Tarenna attenuata, 11-19 pts. wt. canola meal, 6-10 pts. wt. chitosan and 1-4 pts. wt. thickener. USE - The purification agent is useful for purifying domestic sewage. ADVANTAGE - The purification agent reduces the content of pollutants in the domestic sewage. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for method for preparing purification agent, which involves (a) weighing canola meal and T.attenuata, crushing the weighed material, sieving the crushed material using a sieve of 80 mesh size, adding 6-11 times absolute ethanol, extracting for 2 times at 62-70 degrees C (each time for 1.5-1.6 hours), combining the two extracts and concentrating to 20-25% of the original volume to prepare a concentrated liquid, (b) weighing graphene, frying the material at 120-160 degrees C for 32-47 minutes, crushing the weighed material, sieving the crushed material using a sieve of 200 mesh size, (c) weighing sepiolite, crushing the weighed material, sieving the crushed material using a sieve of 100 mesh size and mixing with the graphene powder, (d) adding the mixed powder to the concentrate, placing in an ultrasonic processor, ultrasonically treating at 65-79 degrees C for 1-2 hours to obtain mixed solution (A), (e) dissolving the chitosan in water for 3-5 times combining the mixture (A), ultrasonically treating for 30-42 minutes and centrifuging the material and (f) adding thickener to the supernatant and uniformly stirring the material.