▎ 摘　　要

NOVELTY - Adsorbing polystyrene microplastics in water comprises e.g. (i) preparing graphene oxide; (ii) reducing graphene oxide aqueous solution to obtain two-dimensional reduced graphene oxide; (iii) changing the two-dimensional reduced graphene oxide into three-dimensional reduced graphene oxide by applying freeze-drying method comprising performing freeze drying of two-dimensional reduced graphene oxide to obtain fluffy three-dimensional reduced graphene oxide; (iv) preparing 0.1-0.8 g/l polystyrene microplastic solution and dispersing it uniformly; (v) adding fluffy three-dimensional reduced graphene oxide obtained in step (iii) as an adsorbent into microplastic solution prepared in step (iv), placing mixture in a constant temperature shaking box for shaking, preferably to adsorb polystyrene microplastics on the fluffy three-dimensional reduced graphene oxide; and (vi) allowing mixture to stand, so that precipitating adsorbent completely at bottom and separating from test solution. USE - The method is useful for adsorbing polystyrene microplastics in water. ADVANTAGE - The method: utilizes very small amount of three-dimensional reduced graphene oxide is considerable in short time and three dimensional graphene as adsorbent which has certain feasibility. DETAILED DESCRIPTION - Adsorbing polystyrene microplastics in water comprises (i) preparing graphene oxide by applying modified Hummers method; (ii) reducing graphene oxide aqueous solution by a hydrothermal reduction method to obtain two-dimensional reduced graphene oxide; (iii) changing the two-dimensional reduced graphene oxide into three-dimensional reduced graphene oxide by applying freeze-drying method comprising performing freeze drying of two-dimensional reduced graphene oxide at -30 to -40 degrees C in freeze-dryer for 48 hours to obtain fluffy three-dimensional reduced graphene oxide; (iv) preparing 0.1-0.8 g/l polystyrene microplastic solution, where solvent is ethanol and distilled water with a volume ratio of 1:1, and dispersing it uniformly during preparation process; (v) adding fluffy three-dimensional reduced graphene oxide obtained in step (iii) as an adsorbent into microplastic solution prepared in step (iv), placing mixture in a constant temperature shaking box for shaking at 160-200 rpm/min at room temperature for 5-480 minutes, preferably to adsorb polystyrene microplastics on the fluffy three-dimensional reduced graphene oxide; and (vi) allowing mixture to stand for 30-60 minutes, so that precipitating adsorbent completely at bottom and separating from test solution.