多孔蒙脱土的制备及对Pb(II)吸附特性研究
Preparation of porous montmorillonite and adsorptionproperties study of Pb(II) on It

为改善蒙脱土对Pb（Ⅱ）的吸附性能，以碳酸钙作为致孔剂，以钠基蒙脱土（MMT，montmor-illonite）作为实验原料，制备多孔蒙脱土材料（PM，porous montmorillonite）。通过（SEM，scanning electronmicroscopy），（FTIR，fourier transform infrared spectrum），（XRD，X-ray diffraction）进行表征分析，研究了PM对Pb（Ⅱ）的吸附性能。实验结果表明：PM具有发达的孔状结构；在25℃时，PM对Pb（Ⅱ）的吸附量，随pH值的增加先增加后减小，在pH为5.5时达到最大；PM对Pb（Ⅱ）的吸附动力学过程符合准二级动力学模型；吸附等温线符合Langmuir模型，在25℃，pH为5.5时，饱和吸附量达到143.5 mg·g。
To improve adsorption propertiesof Pb(Ⅱ) onmontmorillonite,porous montmorillonite(PM) is prepared using CaCO3 porogen and Na-montmorillonite material. The properties of PM are characterized by scanning electron microscopy(SEM),Fourier transform infrared spectrum (FTIR) and X-ray diffraction(XRD), and the adsorption properties of Pb(Ⅱ) on PM are discussed.The experimental results show that PM has abundant pores.With the increase of PH value,adsorption capacity by PM of Pb(Ⅱ) increases first and then decreases at 25℃,and the adsorption capacity is the highest when initial pH is 5.5.The adsorption process accords with the pseudo-second order kinetics model and the adsorption isotherm accords with Langmuir equation. The saturated adsorption capacity is 143.5 mg/g at 25℃,when pH is 5.5