【摘要】 采用合成磁铁矿、纤铁矿、四方纤铁矿进行分批实验,研究了其对水溶液中Cd(Ⅱ)的吸附性能。利用X射线粉末衍射仪对3种铁(氢)氧化物进行表征。测定了磁铁矿、纤铁矿、四方纤铁矿的比表面积分别为17.19,121.60,60.92 m~2/g。准二级动力学模型较好地拟合了Cd(Ⅱ)在3种铁(氢)氧化物的动力学数据,3种铁(氢)氧化物对Cd(Ⅱ)的最大吸附量分别为11.83,4.387,3.73 mg/g。pH值小于5时,pH值对磁铁矿和纤铁矿吸附水溶液中Cd(Ⅱ)的能力影响不大;当pH=4时,四方纤铁矿吸附水溶液中Cd(Ⅱ)的效果最好。更多还原

【Abstract】 Batch adsorption experiments were carried using synthetic magnetite, lepidocrocite and akaganeite to investigate the adsorption properties of Cd(Ⅱ) in aqueous solution. Three kinds of iron oxides were characterized by X-ray powder diffraction(XRD). The specific surface areas of magnetite,lepidocrocite and akaganeite were 17.19, 121.60 and 60.92 m~2/g, respectively. The maximum adsorption capacity of the three iron oxides to Cd(Ⅱ) was 11.83, 4.387 and 3.73 mg/g, for magnetite, lepidocrocite and akaganeite, respectively. The kinetic data of Cd(Ⅱ) on three kinds of iron oxides were fitted by the pseudo-second-order equation well. No significant effect of Cd by magnetite and lepidocrocite was little affected at pH < 5;when the pH was 4, akaganeite had the best adsorption capacity for Cd in aqueous solution.更多还原