▎ 摘　　要

NOVELTY - Preparing composite nanomaterial involves ultrasonically dispersing shell powder in deionized water to form shell powder suspension; dispersing nano-scale corn starch in deionized water by ultrasonic to form corn starch suspension; ultrasonically dispersing molybdenum disulfide powder in mixed solution of butanediol and water, centrifugally separating, and taking supernatant to obtain alcohol-water mixture of graphene-like molybdenum disulfide; and mixing shell powder suspension, corn starch suspension and alcohol-water mixture of graphene-like molybdenum disulfide at mass ratio of 5-10:2.5-4.3:0.1-0.3, performing ultrasonic treatment for 60 minutes, and drying. USE - Method for preparing composite nanomaterial. ADVANTAGE - The method prepares the composite nano material in a simple, cost-effective and eco-friendly manner with large specific surface area, good adsorption and photocatalytic activity, and can realize rapid adsorption and purification of pollutants in domestic sewage and aquaculture wastewater.