School of Water Resource and Environmental Engineering, East China University of Technology, Nanchang, Jiangxi, 330013, People's Republic of China.
School of Resources and Environmental Science, Wuhan University, Wuhan, Hubei, 430079, People's Republic of China.
Environ Sci Pollut Res Int. 2020 Aug;27(24):30778-30788. doi: 10.1007/s11356-020-09389-6. Epub 2020 May 30.
In this work, the β-cyclodextrin modified magnetic graphene oxide (β-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 β-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 β-cyclodextrin. The characterization results of FT-IR and XPS show that that β-cyclodextrin and ferroferric oxide have been perfectly compounded to the graphene oxide layer and β-CD/MGO has a particle size of about 460 nm, a specific surface area of 252.3 mg, and a saturation magnetization of 73.5 emu g. The adsorption amount of dichromate ions on the β-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 β-CD/MGO was 49.95 mg g. After five successive adsorbent reuses, the reuse rate is still 73%, indicating the excellent potential reusability of β-CD/MGO adsorbent. β-CD/MGO exhibits excellent adsorption performance for dichromate ions. As an environmentally friendly magnetic adsorbent, β-CD/MGO is suitable for the treatment of dichromate-containing wastewater.
在这项工作中，采用原位共沉淀法制备了β-环糊精修饰的磁性氧化石墨烯（β-CD/MGO）复合材料，并通过傅里叶变换红外光谱（FT-IR）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X 射线光电子能谱（XPS）、振动样品磁强计（VSM）和粒径分析对其进行了表征。研究了β-CD/MGO 对重铬酸根离子的吸附行为，并通过 FT-IR 和 XPS 研究了吸附机理。SEM 和 TEM 的结果表明，氧化石墨烯（GO）层变得粗糙，复合四氧化三铁和β-环糊精后，附着了许多细小颗粒。FT-IR 和 XPS 的表征结果表明，β-环糊精和四氧化三铁已完美复合到氧化石墨烯层上，β-CD/MGO 的粒径约为 460nm，比表面积为 252.3mg，饱和磁化强度为 73.5emu/g。β-CD/MGO 对重铬酸根离子的吸附量受 pH 值、吸附剂用量和吸附时间的影响。动力学研究表明，吸附过程遵循准二级动力学模型。平衡数据与 Langmuir 模型非常吻合，β-CD/MGO 对重铬酸根离子的最大吸附量为 49.95mg/g。经过五次连续的吸附剂重复使用，重复使用率仍为 73%，表明β-CD/MGO 吸附剂具有优异的潜在可重复使用性。β-CD/MGO 对重铬酸根离子表现出优异的吸附性能。作为一种环保型磁性吸附剂，β-CD/MGO 适用于处理含铬废水。
