METHOD FOR PREPARING SIZE-SELECTIVE NANO-MESOPOROUS SIO₂-TIO₂ COMPOSITE PHOTOCATALYTIC MATERIAL

摘要

Disclosed is a method for preparing a nano-mesoporous SiO₂-TiO₂ composite photocatalytic material. The method comprises formulating a Ti-Si composite precursor solution, and formulating polyoxyethylene-polyoxypropylene-polyoxyethylene (P123), n-butyl alcohol and cetyl trimethyl ammonium bromide (CTAB), etc. into a template agent solution system, and then mixing the two solutions to obtain a precipitate, removing chloride ions by filtering and washing, then re-dissolving the precipitate by hydrogen peroxide to obtain a nano-mesoporous titanium dioxide/silicon dioxide composite photocatalytic material. The method achieves the in-situ synthesis of a nanometer silicon oxide-coated titanium oxide structure, avoiding the problems, readily caused by a process of synthesizing silicon oxide and then loading titanium oxide, that a catalyst blocks a mesoporous and is easy to fall off. Meanwhile, compared with the process of synthesizing titanium oxide and then coating with silicon oxide, the method has a simple flow, strong operability, and a relatively low cost, is suitable for batch preparation, has the possibility of industrial production, and has an extensive application prospect.