论文部分内容阅读
本研究在SBA-15分子筛孔道中制备了纳米ZnS。Zn2+首先通过离子交换交换到SBA-15中,通过水热法在SBA-15分子筛孔道中制备了纳米ZnS。(SBA-15)-ZnS复合物由粉末X-线衍射,傅立叶变换红外光谱,低温氮气吸附-解析附技术,固体扩散漫反射光谱以及发光研究进行了表征。粉末X-线衍射研究说明在制备主-客体纳米复合材料中分子筛骨架未被制备过程所破坏,保持完整且结晶度仍很高。傅立叶变换红外光谱表明制备的材料骨架完好。77K低温氮气吸附-解析附研究表明所制备的复合材料孔体积,孔尺寸以及表面积相对于SBA-15分子筛降低,证明客体ZnS已成功地组装入分子筛孔道中。所制备的纳米复合材料固体扩散漫反射吸收光谱相对于体相ZnS显示出蓝移表明,ZnS已限制在分子筛的孔道中且复合材料中分子筛的孔道对ZnS具有明显的立体限域效应,ZnS成功地组装在SBA-15分子筛的孔道中。发光研究表明,(SBA-15)-ZnS样品出现明显发光现象。主-客体复合材料具有良好的发光性能,有望在发光材料领域中获得应用。
In this study, nano-ZnS was prepared in SBA-15 molecular sieve pores. Zn2 + was firstly exchanged into SBA-15 by ion exchange, and nanosized ZnS was prepared by hydrothermal method in the pores of SBA-15 zeolite. (SBA-15) -ZnS complex was characterized by powder X-ray diffraction, Fourier transform infrared spectroscopy, low temperature nitrogen adsorption-desorption technique, solid-diffusion diffuse reflectance spectroscopy and luminescence studies. Powder X-ray diffraction studies indicate that the molecular sieve framework is not destroyed by the preparation process, remains intact and the crystallinity is still very high in the preparation of host-guest nanocomposites. Fourier transform infrared spectroscopy showed that the prepared material skeleton intact. 77K cryogenic nitrogen adsorption - analytical study showed that the prepared composite pore volume, pore size and surface area relative to the SBA-15 molecular sieve decreased, indicating that the guest ZnS has successfully assembled into the molecular sieve pore. The prepared nanocomposite solid diffusion diffuse reflectance absorption spectrum shows a blue shift relative to the bulk ZnS, indicating that ZnS has been confined in the pore of the molecular sieve and that the pores of the molecular sieve in the composite have a significant stereospecific effect on the ZnS. The ZnS is successful Assembled in the pores of SBA-15 zeolite. Luminescence studies showed that (SBA-15) -ZnS samples showed significant luminescence. The host-guest composite has good luminescent properties and is expected to be used in the field of luminescent materials.