Preparation And Photocatalysis Of TiO₂Nanoparticles

Heterogeneous TiO2as a semiconductor material has unique properties of photoelectric effect and photosensitivity, thus is a kind of photocatalyst with high activities for environmental and energy applications, including pollutants degradation in wastewater and air, water splitting for hydrogen generation, energy storage, and dye-sensitized solar cells for electricity production. This paper is focusing on synthesizing TiO2microstures with super properties. XRD, TGA/DSC, XPS, N2-adsorption measurements, TEM, HRTEM, and Raman spectroscopy were used to characterize the prepared samples. The photocatalytic activity was tested by degradating azo dye (MO, MB, Rh B) under near UV irradation.Here, I present a facile synthesis path combing the sol-gel method with solvothermal treatment to form hybrid mesoporous and microporous TiO2. The TiO2precursor was obtained by sol-gel method and then self-assembled into mesopores and micropores by NH4F corrosiveness on the surface of TiO2under hydrothermal process. It can be revealed that the crystallized mesoporous and microporous anatase titania nanoparticles with uniform structure and high surface area have a quite higher activity for azo dye degradation under near UV irradiation. The photocatalytic superiority may be mainly ascribed to the fully crystallized uniform anatase TiO2nanoparticles and the exposed{100} facets.Ag/TiO2microstructure was synthesized by refluxing titanium precursor at different temperature with C sphere as hard template. The existence of rich pores and hydroxyl on the surface of carbon sphere, can absorb Ag+ions firmly. Then TiO2shell coated on the surface of carbon sphere. The hard template was removed by calcination at450℃for3h. It reveals that the synthesized sample is microcluster and full of pores and channels on the surface, moreover, the well-dispersed Ag can be avoided aggregation. As a result, the stability of the sample is improved dramatically.Mesoporous TiO2microsphere is active for photocatalysis. Here I synthesized mesoporous TiO2microsphere, by the optimized synthetic condition. It is found that with TBOT as precursor, CTAB as surfactant, glucose as pore template, HCl as acid source, the sample has the best photocatalytic activity. Moreover, it can be concluded that the superiority of photocatalysis is ascribed to the good structure and surface property of TiO2.