钛交联蒙脱石纳米复合材料的合成与表征

PREPARATION AND CHARACTERIZATION OF Ti-PILLARED CLAYS NANOCOMPOSITE

利用经过精制的钠基蒙脱石作为基质材料,以钛酸正丁酯为钛源,制备了钛交联蒙脱石(Ti-pillared clays,Ti-PILCs)纳米复合材料.利用X射线衍射、热重/差热分析、红外光谱分析、N2吸附-脱附等分析手段对材料进行结构性能表征.X射线衍射分析表明:Ti-PILCs的层间距具有多分散性,d(001)值从钠基蒙脱石的1.28 Bm最高可上升为3.59 nm.热重/差热曲线显示:Ti-PILCs的加热质量损失比钠基蒙脱石大,且脱层间水过程与脱羟基过程的界限变得不清晰.比表面测定显示:比表面积从钠基蒙脱石的31.6 m2/g增大到Ti-PILCs的400 m2/g,且随温度的变化不大.孔径分布的测定表明:钠基蒙脱石和Ti-PILCs均具有物理堆砌形成的'卡房状'孔,而Ti-PILCs中还存在大量交联柱化形成的2～4 nm二维孔.红外光谱进一步证实Ti-PILCs具有Ti-O键和Ti-O-Si键的振动峰,说明该物质是钛交联多孔纳米复合材料.

Using purified Na-montmorillonite as the starting material and Ti （n- C4 H9O）4 as the titanium resource, Ti-pillared clay （Ti-PILCs）nanocomposites were prepared. The composition, structure and properties of the Ti-PILCs were studied by X-ray diffraction（XRD）, thermogravimetry and differential scanning calorimetry（TG- DSC）, Fourier transform infrared（FT- IR） spectroscopy, and nitrogen adsorption desorption. The results of XRD show the interlayer free spacing of Ti-PlLCs has polydispersity, and the value of d（001）, increases from 1.28 nm of sodium montmorillonite to 3.59 nm at most. The TG - DSC curves show the mass loss of Ti-PILCs after heating are more than the sodium montmorillonite and the delineation between the course of water desorption in the interlayer and desorption in the hydroxyl is not clear. Measurement of the specific surface area shows that it increases from the 31. 6 m^2 /g Of the sodium montmorillonite to 400 m^2/g of Ti-PILCs and changes little with increased temperature. The pore size distribution shows the sodium montmorillonite and Ti-PILCs have house-of-cards-like pores physically aggregated and Ti-PILCs has many two-dimensional pores of 2 4 nm formed by pillars. The FTIR results further Si which show the materials are titanium-pillared porous clay nancomposites.