Preparation And Photocatalytic Properties Of Fe, Ag-TiO₂/SBA-16

With the rapid development of industry, environment pollution become more and more serious. So how to control and deal with the enviroment pollution have been the most important thing nowadays. Among all the nano-photocatalytic materials, TiO₂ become a most promising photocatalyst for its strong oxidation activity, stability and nontoxic. However, TiO₂ has two main disadvantages: low quantum yield and low photocatalytic activity. Therefore, how to modify TiO₂ in order to increase its photocatalytic activity and extend its range of photo-response spectrum is the key to further utilize in photocatalysis. In this paper, on the foundation of summarizing the development of the modification of Fe, Ag-TiO₂ photocatalyst, the novelty Fe, Ag- TiO₂/SBA-16 photocatalysts were prepared.SBA-16-supported TiO₂ photocatalyst was synthesized by internal hydrolysis method at different crystallization temperature by using the tri-block copolymer F127 as a template, andtetraethyl orthosilicate (TEOS) as a silica source, tetrabutyl titanate as a titanium source. The synthesized samples were characterized in detail by X-ray diffraction (XRD), N₂ adsorption-desorption, transmission electron microscopy (TEM), UV–visible absorption spectra and X-ray photoelectron spectroscopy (XPS). The results indicated that SBA-16 retained the 3D caged-like mesostructure while TiO₂ located almost inside the mesoporous channels in form of small crystals with anatase structure. However, the specific surface area and pore volume were decreased with the load of TiO₂ increases. The photodecomposition of Rhodamine B (RhB) in aqueous medium was selected to evaluate the photocatalysis performance of TiO₂/SBA-16. The results show that 45%TiO₂/SBA-16100 had the best photocatalytic activity.The Fe, Ag-TiO₂/SBA-16 was prepared with the hydrothermal method with different amounts of TiO₂ and Fe, Ag. XRD show that TiO₂ particle size is small, crystallization is not high. N2 adsorption-desorption and TEM show that SBA-16 retained the 3D caged-like mesostructure and TiO₂ have accumulated on the surface of SBA-16. XPS tests show that Fe³⁺ has entered into the TiO₂ crystal lattice, Ag deposition in TiO₂ surface in the form of simple substance.Using Fe(NO₃)₃·9H₂O and AgNO₃ as the metal source, TBOT and glacial acetic acid as reactant, ethyl acetate as solvent. Fe, Ag-TiO₂/SBA-16 with different amounts of TiO₂ and Fe, Ag was synthesized by solvothermal method. XRD show that the TiO₂ has large particle size and high degree of crystallization. N₂ adsorption-desorption and TEM show that the TiO₂ successfully grow inside the pore channels of the host SBA-16. XPS tests show that Fe³⁺ has entered into the TiO₂ lattice. While Ag deposited on the TiO₂ surface in the form of simple substance, and dispersedThe comparative study on the photocatalytic performance of Fe, Ag-TiO₂/SBA-16 uniformly. prepared by solvothermal and hydrothermal methods. After 2h photodegradation, the photocatalytic results show that the P25 degraded of Rhodamine B was 22.39%, while the sample 0.05%Fe-TiO₂/SBA-16 prepared by solvothermal degraded of RhB was 92.76%, and the 0.5at%Ag-45%TiO₂/SBA-16 was 95.05%. The Fe, Ag-TiO₂/SBA-16 prepared by this study showed much higher photodegradation ability for RhB than that of commercial pure TiO₂ nanoparticles P25.