structure and photocatalytic activity studies of tio2/cds@mcm

In recent decades, problems such as low surface area, agglomeration in the solution, and low photocatalytic activity in visible light have limited usage of nano-photocatalysts therefore, many strategies have been used to increase photocatalytic activity and absorption of titania as one of the most applicable photocatalysts in this paper, the immobilization of various percentage of cds/tio2 composite on mesoporous mcm-41 was investigated a series of nano-catalysts were prepared by sol-gel, chemical precipitation and impregnation methods and characterized with small angle x-ray diffraction (saxs), fourier transform infrared spectroscopy (ftir), uv–visible diffuse reflectance spectra (uv-vis drs) and bet their photocatalytic activities have been studied on the degradation of methylene blue under visible light the modified sample with 25 wt % cds/tio2 has highest activity but the result shows that by loading more than 15 wt % cds/tio2, the raet of improvment activity of methylene blue will be reduced it is guessed that when cds/tio2 loading was more than 15 wt %, the adsorption activity reduced significantly due to pore blockage of mcm-41