Studies On (SBA-15)-Sulfide Host-Guest Nanocomposite Material

Host-guest nanocomposite materials are of great research interests recently.Compared with other mesoporous molecular sieves,SBA-15 has larger pores,thicker wails and higher thermal stability and hydrothermal stability.SBA-15 host-sulfide guest nanocomposite material was synthesized in this thesis.The mesoporous SBA-15 molecular sieve was synthesized in acidic medium by using triblock copolymers(EG₂₀PG₄₀EG₂₀) as template,tetraethoxysilane(TEOS) as silica resource. Pb²⁺ and Zn²⁺ were incorporated in the SBA-15 separately by ion-exchange method,then PbS and ZnS were synthesized in the channels of the SBA-15 molecular sieve by hydrothermal method.The products were characterized by means of chemical analysis, powder X-ray diffraction,Fourier transform infrared spectroscopy,low-temperature nitrogen adsorption-desorption technique,solid state diffuse reflectance absorption spectroscopy and luminescence studies.The results showed that the guest molecules were successfully incorporated in the channels of the SBA-15 molecular sieve and the frameworks of the SBA-15 in the prepared composite materials did not collapse.The host-guest composite materials possess good luminescence property and they are hopeful to get application in the field of optical materials.