▎ 摘　　要

NOVELTY - Preparation of sewage treatment agent involves dissolving graphene oxide in ultrapure water, ultrasonically processing to obtain 40-80 mg/L dispersion (A), dissolving cobalt nitrate hexahydrate, hexamethylenetetramine and crosslinking agent in ultrapure water, stirring to obtain dispersion (B), adding dispersion (B) to dispersion (A), stirring, adjusting pH to 9-11 with sodium hydroxide solution to obtain dispersion (C), adding dispersion (C) to PTFE-lined stainless steel autoclave, hydrothermally reacting, cooling to room temperature, washing with deionized water and ethanol pentahydrate for several times, leaving still, sucking supernatant liquid containing unreacted impurities again, and freeze-drying lower layer of cobalt tetroxide/graphene oxide composite with less moisture content. USE - Preparation of sewage treatment agent for ozonization water treatment (all claimed). ADVANTAGE - The preparation method is simple and produces cobalt tetroxide composite aerogels as treatment agent with excellent hydrophilic and hydrophobic property and excellent performance for the ozonization and degradation of hydrophilic/lipophilic pollutants. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for application method of the sewage treatment agent for ozonization water treatment, which involves adding the aerogel sewage treatment agent to ozonized water treatment system containing pollutant, stirring, passing ozone at 20 degrees C to degrade pollutants in the water, leaving still, gently removing aerogel on liquid surface with forceps, washing with deionized water, naturally drying and storing for later use.