Affiliated Kunshan Hospital, Jiangsu University, Kunshan 215300, P. R. China.
School of Pharmacy, Jiangsu University, Zhenjiang 212013, P. R. China.
J Nanosci Nanotechnol. 2019 May 1;19(5):2702-2709. doi: 10.1166/jnn.2019.15825.
Magnetic MnFe₂O₄ nanosheets were prepared via the facile combustion process, the morphology, chemical composition, microstructure and magnetic properties of them were investigated by SEM, EDX, XRD, TEM, SAED and VSM. The as-prepared magnetic MnFe₂O₄ nanosheets calcined at 400 °C for 2 h with absolute alcohol of 30 mL were characterized with average diameter of about 55 nm, the thickness of around 20 nm, the specific magnetization of 44.0 Am²/kg and the specific surface area of 49.6 m²/g. The removal behavior of Congo red (CR) from aqueous solutions onto MnFe₂O₄ nanosheets was investigated by UV spectroscopy at room temperature; the adsorption kinetics data related to the adsorption of CR from aqueous solutions were in good agreement with the pseudo-second-order kinetic model in the initial concentrations of 80-400 mg/L. By comparison of the Langmuir, Freundlich and Temkin models for adsorption isotherms of CR, the Temkin model (correlation coefficient ² = 0.998) could be used to evaluate the adsorption isotherm of CR onto the magnetic MnFe₂O₄ nanosheets at room temperature, which suggested that the adsorption of CR onto the magnetic MnFe₂O₄ nanosheets was a hybrid of monolayer and multilayer absorbing mechanism.
通过简单的燃烧过程制备了磁性 MnFe₂O₄ 纳米片，通过 SEM、EDX、XRD、TEM、SAED 和 VSM 研究了它们的形貌、化学成分、微观结构和磁性。在 400°C 下用 30 mL 绝对乙醇煅烧 2 小时制得的磁性 MnFe₂O₄ 纳米片的平均直径约为 55nm，厚度约为 20nm，比磁化强度为 44.0 Am²/kg，比表面积为 49.6 m²/g。通过室温下 UV 光谱法研究了 MnFe₂O₄ 纳米片从水溶液中去除刚果红（CR）的去除行为；在初始浓度为 80-400mg/L 时，与从水溶液中吸附 CR 相关的吸附动力学数据与准二级动力学模型吻合较好。通过比较 CR 的 Langmuir、 Freundlich 和 Temkin 吸附等温线模型，Temkin 模型（相关系数 ² = 0.998）可用于评估 CR 吸附到磁性 MnFe₂O₄ 纳米片上的吸附等温线，这表明 CR 吸附到磁性 MnFe₂O₄ 纳米片上是单层和多层吸收机制的混合。
