▎ 摘　　要

In this work, the beta-cyclodextrin modified magnetic graphene oxide (beta-CD/MGO) composite was fabricated by the in situ co-precipitation method and characterized by Fourier transform-infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), vibrating sample magnetometer (VSM), and particle size analysis. The adsorption behavior of dichromate ions on the beta-CD/MGO was investigated, and the mechanism of adsorption was also studied using FT-IR and XPS. The results from SEM and TEM showed that the graphene oxide (GO) layer became rough, and many fine particles were attached after compounding with ferroferric oxide and beta-cyclodextrin. The characterization results of FT-IR and XPS show that that beta-cyclodextrin and ferroferric oxide have been perfectly compounded to the graphene oxide layer and beta-CD/MGO has a particle size of about 460 nm, a specific surface area of 252.3 m(2)g(-1), and a saturation magnetization of 73.5 emu g(-1). The adsorption amount of dichromate ions on the beta-CD/MGO is affected by pH, adsorbent dosage, and adsorption time. Kinetic studies showed that the adsorption process followed a pseudo-second-order kinetic model. Equilibrium data agreed very well with the Langmuir model, the maximum adsorption amount of dichromate ions on the beta-CD/MGO was 49.95 mg g(-1). After five successive adsorbent reuses, the reuse rate is still 73%, indicating the excellent potential reusability of beta-CD/MGO adsorbent. beta-CD/MGO exhibits excellent adsorption performance for dichromate ions. As an environmentally friendly magnetic adsorbent, beta-CD/MGO is suitable for the treatment of dichromate-containing wastewater.