Cyclodextrin Self-Assembled Graphene Oxide Aerogel Microspheres As Broad-Spectrum Adsorbent For Removing Dyes And Organic Micropollutants From Water

Adsorption is used extensively to deal with increasingly serious water pollution. In this paper, beta-cyclodextringraphene oxide aerogel microspheres (CD-GAM) with 3D porous structure was prepared by electrospraying combining with freeze-casting and sequently mild self-assembly. Owing to the integration of graphene oxide (GO) and beta-cyclodextrin (beta-CD), the CD-GAMs exhibit excellent broad-spectrum adsorption capabilities for dyes and organic micropollutants, including anionic dyes of methylene blue (439 mg/g) and Rhodamine B (388 mg/g), cationic dyes of acid red 87 (234 mg/g) and methyl orange (167 mg/g), organic micropollutants aromatic model compound of carcinogen 2,4-dichlorophenol (17 mg/g), pharmaceuticals of propranolol hydrochloride (49 mg/g), contraceptive ethynyl estradiol (19 mg/g) and plastic components bisphenol A (38 mg/g). The adsorption capacity of CD-GAM for most pollutants reach equilibrium within 10 min. In addition, the CD-GAM maintained stable regenerative adsorption capacity more than 80 % in five cycles. The broad-spectrum adsorbent CD-GAM is an ideal choice for removing complex and diverse pollutants from wastewater.