论文部分内容阅读
以FeCl_2×4H_2O和FeCl_3×6H_2O为原料、NaOH为沉淀剂,采用撞击流-旋转填料床制备Fe_3O_4纳米颗粒,考察了超重力因子、液体流量和反应物浓度对Fe_3O_4颗粒粒径的影响及其对Pb(Ⅱ)和Cd(Ⅱ)的吸附性能.结果表明,随超重力因子、液体流量及反应物浓度增加,Fe_3O_4颗粒的粒径减小,最佳制备条件为超重力因子65.32、液体流量60 L/h及Fe Cl3×6H2O浓度0.321 mol/L,该条件下所制超顺磁性单分散Fe_3O_4纳米颗粒的平均粒径约为10 nm,饱和磁化强度为60.5 emu/g.Fe_3O_4纳米颗粒对Pb(Ⅱ)和Cd(Ⅱ)吸附过程符合Langmuir吸附等温模型,计算的最大吸附容量分别为30.47和13.04 mg/g.
Fe_3O_4 nanoparticles were prepared by impinging stream-rotating packed bed with FeCl_2 × 4H_2O and FeCl_3 × 6H_2O as raw materials and NaOH as precipitating agent. The effects of supergravity factor, liquid flow rate and reactant concentration on the particle size of Fe_3O_4 particles were investigated. Pb (Ⅱ) and Cd (Ⅱ). The results show that the particle size of Fe 3 O 4 particles decreases with the increase of supergravity factor, liquid flow rate and reactant concentration. The optimum preparation conditions are the supergravity factor of 65.32, the liquid flow rate of 60 The average particle size of superparamagnetic monodisperse Fe_3O_4 nanoparticles was about 10 nm and the saturation magnetization was 60.5 emu / g under the conditions of L / h and FeCl3 × 6H2O concentration of 0.321 mol / L. The effect of Fe 3 O 4 nanoparticles on Pb The adsorption processes of (Ⅱ) and Cd (Ⅱ) conformed to the Langmuir adsorption isotherm model. The calculated maximum adsorption capacities were 30.47 and 13.04 mg / g, respectively.