Su Guodong, Zheng Qifu, Wang Yulin, Liu Jia, Xiang Jun
College of Chemical and Material Engineering, Quzhou University, Quzhou 324000, P. R. China.
School of Mathematics and Physics, Jiangsu University of Science and Technology, Zhenjiang, 212003, P. R. China.
J Nanosci Nanotechnol. 2018 Apr 1;18(4):2665-2672. doi: 10.1166/jnn.2018.14286.
Magnetic 0.9NiFe2O4/0.1SiO2 nanocomposites were successfully prepared via a rapid combustion process, and the morphology and magnetic properties of them were investigated by TEM, XRD, VSM, and BET techniques. The magnetic 0.9NiFe2O4/0.1SiO2 nanocomposites calcined at 400 °C for 2 h with absolute alcohol of 20 mL were characterized with the average particle size of about 28 nm and the specific magnetization of 192.0 Am2/kg. The magnetic 0.9NiFe2O4/0.1SiO2 nanocomposites were employed to remove methylene blue (MB) from aqueous solutions, the adsorption kinetics and adsorption isotherm of MB onto 0.9NiFe2O4/0.1SiO2 nanocomposites at room temperature were investigated, and the regression equations were found in good agreement with the pseudo-second-order model in the initial MB concentrations of 100-600 mg/L; the adsorption equilibrium data of MB onto 0.9NiFe2O4/0.1SiO2 nanocomposites at room temperature were analyzed with Langmuir, Freundlich and Redlich-Peterson models, and the adsorption isotherm was most effectively described by the Redlich-Peterson model based on the value of the correlation coefficient (0.9810).
通过快速燃烧法成功制备了磁性0.9NiFe2O4/0.1SiO2纳米复合材料，并采用透射电子显微镜（TEM）、X射线衍射仪（XRD）、振动样品磁强计（VSM）和比表面积分析仪（BET）技术对其形貌和磁性能进行了研究。在400℃下用20 mL无水乙醇煅烧2 h的磁性0.9NiFe2O4/0.1SiO2纳米复合材料的平均粒径约为28 nm，比磁化强度为192.0 Am2/kg。将磁性0.9NiFe2O4/0.1SiO2纳米复合材料用于从水溶液中去除亚甲基蓝（MB），研究了室温下MB在0.9NiFe2O4/0.1SiO2纳米复合材料上的吸附动力学和吸附等温线，发现在初始MB浓度为100 - 600 mg/L时，回归方程与准二级模型吻合良好；用Langmuir、Freundlich和Redlich - Peterson模型分析了室温下MB在0.9NiFe2O4/0.1SiO2纳米复合材料上的吸附平衡数据，基于相关系数值（0.9810），Redlich - Peterson模型最有效地描述了吸附等温线。
