The adsorptive ability of Ti-pillared montmorillonite for lead (II) cation

In this thesis, Ti-pillared montmorillonite was prepared by a sol-gel method. The sample was characterized by X-ray diffraction (XRD) and high resolution transmission electron microscopy (HRTEM). The results show that the crystal phase of the sample is composed of anatase and montmorillonite. The microstructure of the sample is still layered structure, in which anatase particles lie in the interlayer space. Furthermore, the XRD results indicate that the interlayer distance of crystal plane (001) of the montmorillonite left-shift obviously. In other words, its interlayer distance increases obviously. The adsorptive ability of the sample was tested with industry wastewater, which containing Pb2+. The results indicate that the adsorptive rate of the sample for lead (II) cation is 100% almost. The Ti-pillared montmorillonite absorbed Pb2+ saturatedly was impregnated into 3 mol/L nitric acid solution for 2 h to dissolve the lead cation, then it was rinsed by deionized water for three times and dried at 120 °C overnight. The sample impregnated by nitric acid solution was used to treat Pb2+ containing industry wastewater again. The results show that its adsorptive rate can still reach above 95%.