Feasibility of using a rotating packed bed in preparing Fe3O4 nanoparticles
Feasibility of using a rotating packed bed in preparing Fe3O4 nanoparticles
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DOI：
10.1016/j.cej.2012.06.075
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发表时间：
2012-09
影响因子：
15.1
通讯作者：
Chia-Chang Lin;Jui-Min Ho;H. Hsieh
中科院分区：
文献类型：
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作者：
Chia-Chang Lin;Jui-Min Ho;H. Hsieh
采用旋转填充床（RPB）连续泵入FeCl 3/FeCl 2水溶液和NaOH溶液，在0.148mol/L的FeCl 3·6 H2O、0.075mol/L的FeCl 2·4 H2O和0.888mol/L的NaOH溶液中进行共沉淀，制备了纳米Fe 3 O 4。采用1800 rpm的转速、500 mL/min的液体流速和60°C的温度。以该方法制备的Fe 3 O 4纳米粒子的平均粒径为6.4nm，最大饱和磁化强度为50 emu/g，BET比表面积为173 m2/g。Fe_3O_4纳米粒子的生产速率为17 kg/天。采用罗丹明B（RhB）脱色法测定了RPB法制备的Fe 3 O 4纳米粒子的H2 O2活化能力，结果表明，Fe 3 O 4的用量、H2 O2的浓度和温度均与其活化能力有关。在pH 5、80°C、Fe 3 O 4投加量为0.30g/L、H2 O2浓度为0.11mol/L的条件下，采用旋转床制备的Fe 3 O 4纳米粒子对H2 O2具有活化作用，在75 min内脱色率约为100%，脱色速率常数为0.0592min-1。Fe 3 O 4-H2 O2体系对RhB的脱色符合准一级动力学模型。
Fe3O4nanoparticles were prepared by continuously pumping aqueous solutions of FeCl3/FeCl2and NaOH into a rotating packed bed (RPB), where 0.148mol/L of FeCl3·6H2O, 0.075mol/L of FeCl2·4H2O, and 0.888mol/L of NaOH co-precipitated. A rotational speed of 1800rpm, liquid flow rates of 500mL/min, and a temperature of 60°C were adopted. Fe3O4nanoparticles that were prepared in this manner had an average diameter of 6.4nm, a maximal saturation magnetization of 50emu/g, and a BET surface area of 173m2/g. The rate of production of Fe3O4nanoparticles was 17kg/day. The H2O2-activating capacity of Fe3O4nanoparticles that were prepared using the RPB, measured using the decolorization of Rhodamine B (RhB), was related to the Fe3O4dosage, the H2O2concentration, and the temperature. At pH 5 and 80°C with an Fe3O4dosage of 0.30g/L and an H2O2concentration of 0.11mol/L, the Fe3O4nanoparticles that were prepared using the RPB were observed to activate H2O2and to have a decolorization efficiency of approximately 100% in 75min with an observed decolorization rate constant of 0.0592min−1. The decolorization of RhB in the Fe3O4–H2O2process was consistent with the pseudo-first-order kinetic model.