▎ 摘　　要

NOVELTY - The preparation method of graphene oxide composite modified attapulgite water purification agent involves: (1) adding oligomeric 3-aminopropyltriethoxysilane to graphene oxide aqueous dispersion to obtain flocculated precipitate, subjecting flocculated precipitate and polyacrylamide to reaction under the catalysis of carbodiimide to obtain acrylamide oligomer graphene oxide, adding thiourea to aqueous solution of acrylamide oligomer graphene oxide to obtain graphene oxide composite by water bath method; and (2) crushing natural attapulgite to 100-200 mesh. USE - The method is useful for preparing graphene oxide composite modified attapulgite water purification agent (claimed). ADVANTAGE - The method enables simple and economical preparation of graphene oxide composite modified attapulgite water purification agent with unique layered structure, large specific surface area and increased absorbing and decoloring ability in an environmentally-friendly manner. DETAILED DESCRIPTION - The preparation method of graphene oxide composite modified attapulgite water purification agent involves: (1) adding oligomeric 3-aminopropyltriethoxysilane to graphene oxide aqueous dispersion to obtain flocculated precipitate, subjecting flocculated precipitate and polyacrylamide to reaction under the catalysis of carbodiimide to obtain acrylamide oligomer graphene oxide, adding thiourea to aqueous solution of acrylamide oligomer graphene oxide to obtain graphene oxide composite by water bath method, and then washing with water and freeze-drying; (2) crushing natural attapulgite to 100-200 mesh, adding 4-6 times the weight of deionized water to obtain suspension slurry, thoroughly dispersing by ultrasonic waves, centrifuging to take upper suspension, carrying out vacuum filtration to obtain attapulgite, drying, placing dried attapulgite in flask, adding 2 mole hydrochloric acid to carry out ultrasonic treatment for 10-20 minutes, carrying out vacuum filtration, drying in oven under vacuum and grinding to 100-200 mesh to obtain modified attapulgite; and (3) adding graphene oxide composite obtained in step (1), modified attapulgite prepared in step (2), powdered activated carbon, vinyltrimethoxysilane and composite microbial powder to round bottom flask, adding water under stirring, then carrying out ultrasonic treatment for 30-40 minutes, performing vacuum filtration, drying in oven under vacuum, and grinding to 100-200 mesh to obtain product.