Li Yunlong, Lu Lu, Li Xiuping, Chen Dan, Ma Liyu, Liu Ruijiang
J Nanosci Nanotechnol. 2016 Jun;16(6):6131-8. doi: 10.1166/jnn.2016.10842.
Magnetic NiFe2O4 nanorods were prepared successfully via a facile solution combustion process, the morphology, chemical composition, microstructure and magnetic properties of as-prepared NiFe2O4 nanorods were investigated by XRD, VSM, SEM, TEM, EDX, SAED and BET techniques. The magnetic NiFe2O4 nanorods were characterized with average length of about 130 nm, the diameter of around 25 nm, the specific magnetization of 105.2 Am2/kg, and the specific surface area of 88.8 m2/g. The nanorods were employed to remove congo red (CR) from aqueous solutions, the adsorption kinetic and adsorption isotherm of CR onto NiFe2O4 nanorods at room temperature were investigated. The regression equation was found in good agreement with the pseudo-second-order kinetic model in a range of initial CR concentrations of 80-400 mg/L. Compared with Freundlich and Temkin models, Langmuir model fitted the adsorption isotherm of CR onto NiFe2O4 nanorods better, which suggested that the adsorption of CR onto NiFe2O4 nanorods was a monolayer absorbing mechanism. Meanwhile, the adsorption capacity of CR onto NiFe2O4 nanorods is large when pH is less than 9.
通过简便的溶液燃烧法成功制备了磁性NiFe2O4纳米棒，采用XRD、VSM、SEM、TEM、EDX、SAED和BET技术对所制备的NiFe2O4纳米棒的形貌、化学成分、微观结构和磁性进行了研究。所制备的磁性NiFe2O4纳米棒的特征为平均长度约130nm，直径约25nm，比磁化强度为105.2 Am2/kg，比表面积为88.8 m2/g。将该纳米棒用于从水溶液中去除刚果红（CR），研究了室温下CR在NiFe2O4纳米棒上的吸附动力学和吸附等温线。在初始CR浓度为80 - 400 mg/L范围内，回归方程与准二级动力学模型吻合良好。与Freundlich模型和Temkin模型相比，Langmuir模型能更好地拟合CR在NiFe2O4纳米棒上的吸附等温线，这表明CR在NiFe2O4纳米棒上的吸附为单分子层吸附机制。同时，当pH小于9时，CR在NiFe2O4纳米棒上的吸附容量较大。
