Preparation And Photo-catalytic Activity Of Nano Film TiO₂ Coating On Fly Ash Micro-sphere

Since the discovery of the photocatalytic splitting of water on TiO₂ electrode by Fujishima and Honda in 1972, enormous effort has been spent on the study of TiO₂ under light illumination, due to its various potential applications, such as photocatalysis. The optical properties, in particular the absorption, of TiO₂ are essential to its photon-driven applications. Typically, TiO₂ absorbs in the UV regime, which is only a small fraction of the sun's energy (<5%). The development of visible-light-driven photocatasts, therefore, has become one of the most challenging topics. Doped TiO₂ has been recognized as a photocatalst for water splitting and pollutant degradation under visible light irradiation.Titanium dioxide loaded fly ash micro-sphere photo-catalyst was prepared by sol-gel technique using tetrabutyl titanate as the titanic source and fly ash micro-sphere as the supporter, and characterized by UV-VIS absorption spectrum. The crystal phase and morphology of titanium dioxide micro-sphere were investigated by XRD and SEM. The experimental results showed that with TiO₂ loaded fly ash micro-sphere photo-catalyst, prepared in 500℃, degraded >85% methylene blue irradiated by UV-light. In some condition, with AgNO₃ or MoS₂ NAno-tube mingled Nano-TiO₂ micro-sphere catalyst had higher activity for photo-catalytic decomposition (>99%) and the range of the absorption spectrum was wider to that of titanium dioxide powder. Mine while this paper is a summary about the immobilizations of nanosized titanium dioxide photo-catalysis, including immobilization methods, immobilization mechanisms and their qualification.