氟掺杂钛柱撑蒙脱石的制备及其除砷应用研究

利用四氯化钛为前驱体，制备了不同氟掺杂量的钛柱撑蒙脱石。通过X射线衍射、傅立叶转换红外光谱、透射电子显微镜及比表面积、孔隙度分析等手段对材料结构进行表征，并考察了不同氟掺杂量的钛柱撑蒙脱石对饮用水中微量砷的吸附作用。结果表明，氢氟酸掺杂量为20 mL的20HF-Ti-MMT形成了钛柱撑结构，材料中的锐钛矿型二氧化钛颗粒粒度分布均匀，结晶度好，材料颗粒均匀，晶型完整，稳定性良好，由于比表面积大和表面羟基含量多等特点对饮用水中微量砷的吸附效果较佳，砷吸附率最高为99.76%。

Preparation of fluorine doped titanium pillared montmorillonite and its arsenate adsorbing application

Titanium pillared montmorillonite（Ti-MMT） modified with different proportions of fluorine element was preparedwith TiCl4 as the precursor.The structure of the as-prepared sample was characterized by X-ray diffraction（XRD），Fouriertransform infrared（FT-IR），transmission electron microscopy（TEM），and surface area/pore diameter analysis.Furthermore，the influence of fluorine doping amounts on the adsorptions of trace arsenate in drinking water was investigated.Results indi-cated that when the doping amount of hydrofluoric acid was 20 mL，the 20HF-Ti-MMT with titanium pillared structure was obtained.Anatase-type TiO2 particles were deposited on the surface of 20HF-Ti-MMT with homogeneous particle size，well-crystallized shape，high crystallization integrity，and good stability.The 20HF-Ti-MMT had better effect on adsorption of trace arsenate in drinking water than the others due to its higher specific surface area and larger surface hydroxyl content.The highest arsenate adsorption rate was 99.76%.