Characterization and Photocatalytic Activity of ZnO, ZnS, ZnO/ZnS, CdO, CdS and CdO/CdS Nanoparticles in Mesoporous SBA-۱۵

Grinding (solvent-free) method was used as a superior technique to prepare mesoporous photocatalysts of ZnO, ZnS, ZnO / ZnS, CdO, CdS and CdO / CdS-SBA-۱۵. In this technique, the nitrate, acetate and chloride salts of zinc and/or cadmium were grinded with as-synthesized SBA-۱۵ as a mesoporous material. The controllable sulfurationis was used to prepare ZnS, ZnO/ZnS, CdS and CdO/CdS-SBA-۱۵ at temperature of ۸۰ °C. The advantages of grinding technique were: i) the elimination of solvent and thus decrease of expense and ii) the complete incorporation of metal salts in the nanochannel of mesoporous material in a short time. X-ray powder diffraction, N۲ adsorption-desorption and FT-IR spectroscopy were used to characterize the prepared materials. The highly dispersed semiconductors in SBA-۱۵ demonstrate an active photodegradation of Congo red in aqueous solution. The nanocomposites of ZnO/ZnS and CdO/CdS in channels of SBA-۱۵ showed the highest photocatalytic activity. The photocatalytic activity of ZnO-, ZnS- and ZnO/ZnS-SBA-۱۵ were also dependent on the salt precursor of zinc. The prepared composite photocatalysts of zinc/SBA-۱۵, by using ZnCl۲ as salt precursor, indicated the higher activity.

کلیدواژه ها:

photocatalyst ، SBA-۱۵ ، nanoparticles ، Congo red ، Zinc ، Cadmium