化工进展2018，Vol.37Issue(5)：1680-1686,7.DOI:10.16085/j.issn.1000-6613.2017-1343
超重力液相沉淀法制备纳米铁酸钴
Preparation of cobalt ferrite nanoparticles by high gravity liquid precipitation method
祁贵生 1武晓利 1刘有智 1郑奇 1郭林雅1
作者信息
- 1. 中北大学超重力化工过程山西省重点实验室,山西省超重力化工工程技术研究中心,山西 太原 030051
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摘要
Abstract
Nanoparticles prepared by magnetic stirrer tend to have a wide particle size distribution and uneven dispersion. In order to address these problems,CoFe2O4nanoparticles were prepared by chemical coprecipitation in impinging stream-rotating packed bed(IS-RPB) using aqueous solutions of Fe(NO3)3/Co(NO3)2and NaOH as raw materials. The effects of rotational speed,liquid flow rate, NaOH concentration and crystallization time on the particle size of CoFe2O4nanoparticles were examined,and their magnetic properties were compared with that prepared by magnetic stirrer. The particle size,morphology and magnetic properties of as prepared nanoparticles were characterized by X-ray diffraction(XRD),fourier infrared spectroscopy(FTIR),transmission electron microscopy (TEM),nanoparticle size analyzer and vibrating sample magnetometer(VSM). The results showed that the particle size of CoFe2O4nanoparticles decreases with the increase of rotational speed,liquid flow rate and NaOH concentration,but increases with the increase of crystallization time. The optimum operating conditions are as follows:rotational speed 900r/min,liquid flow rate 60L/h,NaOH concentration 3mol/L,and crystallization time 6h. CoFe2O4nanoparticles prepared under optimum operating conditions have an irregular shape with an average diameter of about 20nm and a saturation magnetization of 75.43emu/g,which is 40% higher than that prepared by magnetic stirrer.关键词
超重力/化学共沉淀/撞击流-旋转填料床/铁酸钴/纳米粒子Key words
high gravity/chemical coprecipitation/impinging stream-rotating packed bed/cobalt ferrite (CoFe2O4)/nanoparticles分类
化学化工引用本文复制引用
祁贵生,武晓利,刘有智,郑奇,郭林雅..超重力液相沉淀法制备纳米铁酸钴[J].化工进展,2018,37(5):1680-1686,7.
