To Tioso < Sub > 4 < / Sub > As Raw Material To Hydrothermal Synthesis Of Nanometer Tio < Sub > 2 < / Sub > And Its Photocatalytic Performance

Nano-TiO₂catalyst was synthesized through one-pot microwave-hydrothermalmethod with industrial grade TiOSO₄as the raw material and urea as the precipitatingagent in this paper. TiOSO₄pretreatment process, the adding method and amount of theprecipitating agent, microwave-hydrothermal conditions, precipitation approach andcalcination temperature were optimized respectively, and a simple and efficient processroute was defined.On the basis of the process mentioned above, nano-TiO₂was surface-modifiedusing PAA and PAM as the surface modifier respectively to further enhance the catalyticactivity of nano-TiO₂. Effect of the adding order and amount of the surface modifier andthe corresponding microwave-hydrothermal conditions on the catalytic activity of theproduct was explored to determine the optimal process conditions. PAA/TiO₂andPAM/TiO₂were comparatively studied in terms of environmental protection, catalyticactivity and so on, which showed that PAM/TiO₂was more suitable for industrialproduction.Finally, the structure and morphology of the pure TiO₂and PAM/TiO₂werecharacterized via the analytical tools of IR, TG, BET, XPS, TEM and so on to explorethe reasons for the catalytic activity improvement of the latter. The result showed thatthe surface modification with PAM made PAM/TiO₂has higher separative efficiency ofphoto-generated carrier, smaller particle size, bigger specific surface area and betterdispersion than the pure TiO₂, and all these factors helped to improve the photocatalyticactivity.