Affiliated Kunshan Hospital, Jiangsu University, Kunshan 215300, P. R. China.
College of Vanadium and Titanium, Panzhihua University, 617000, P. R. China.
J Nanosci Nanotechnol. 2020 Feb 1;20(2):957-964. doi: 10.1166/jnn.2020.16932.
Magnetic NiCoFe₂O₄ nanoparticles were prepared via the alcohol-solution combustion process, the morphology and magnetic property of them were investigated by the scanning electron microscopy (SEM), the transmission electron microscope (TEM), the X-ray diffraction (XRD), the vibrating sample magnetometer (VSM), the energy dispersive spectroscopy (EDS) and the Brunauer-Emmett-Teller (BET). The as-prepared magnetic NiCoFe₂O₄ nanoparticles calcined at 400 °C for 2 h with absolute alcohol of 30 mL were characterized with the average nanoparticle size of around 30 nm and the specific magnetization (Ms) of 14.7 emu/g. The adsorption characteristics of reactive blue (RB) from aqueous solutions onto NiCoFe₂O₄ nanoparticles were investigated by UV spectroscopy at room temperature; the adsorption kinetics data were in good agreement with the pseudo-second-order kinetic model in the initial RB concentrations of 100-400 mg/L. Compared with Langmuir and Freundlich models, the Temkin model (correlation coefficient ² =0.9998) could be used to evaluate the adsorption isotherm of RB onto the magnetic NiCoFe₂O₄ nanoparticles at room temperature, which revealed that the adsorption of RB onto the magnetic NiCoFe₂O₄ nanoparticles was a hybrid of monolayer and multilayer adsorbing mechanism.
通过醇溶液燃烧法制备了磁性 NiCoFe₂O₄ 纳米粒子，通过扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X 射线衍射（XRD）、振动样品磁强计（VSM）、能谱仪（EDS）和 Brunauer-Emmett-Teller（BET）研究了它们的形态和磁性。用 30ml 绝对酒精在 400°C 下煅烧 2 小时的所制备的磁性 NiCoFe₂O₄ 纳米粒子具有约 30nm 的平均纳米粒子尺寸和 14.7 emu/g 的比磁化强度（Ms）。在室温下通过紫外光谱研究了反应性蓝（RB）从水溶液中吸附到 NiCoFe₂O₄ 纳米粒子上的吸附特性；在初始 RB 浓度为 100-400mg/L 时，吸附动力学数据与准二级动力学模型吻合较好。与 Langmuir 和 Freundlich 模型相比，Temkin 模型（相关系数²=0.9998）可用于评估 RB 在室温下吸附到磁性 NiCoFe₂O₄ 纳米粒子上的吸附等温线，这表明 RB 吸附到磁性 NiCoFe₂O₄ 纳米粒子上是单层和多层吸附机制的混合。
