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Hydrothermal Preparation and Potocatylci Activity of Differnt Morpholgy Titanian

Author: YuZhen
Tutor: WangHuaiYuan；WangBaoHui
School: Northeast University of Petroleum
Course: Chemical processes
Keywords: Micron titanium dioxide Hydrothermal method Morphology Photocatalytic Activity
CLC: O643.36
Type: Master's thesis
Year: 2011
Downloads: 88
Quote: 0
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Abstract


In recent years a large number of industrial wastewater discharges has brought great harm to the ecological environment, how to control the pollution has become a focus of attention around the world. Especially in the treatment of wastewater difficult to degrade organic pollutants in water pollution control, heterogeneous semiconductor photocatalytic technology has unique advantages. In oxide semiconductor materials, nano-TiO 2 as an excellent photocatalyst because of its advantages in light of the strong oxidizing, non-toxic and long-term stability governance environment pollution hotspot. Most of the current research for nanoscale TiO 2 modified to increase its photocatalytic activity, but the the nanoscale powder catalyst applications exist in the liquid phase systems are difficult to recycle, and increase the cost of wastewater treatment . In view of this situation, this study focused on the control of TiO 2 particle size and morphology control at the micron level, photocatalytic performance while also solve the problem of catalyst recycle and reuse. The study mainly includes the following points: 1. Stable rutile TiO 2 reactants hydrothermal prepared titanate large specific surface area after calcined mesoporous mixed polymorphs TiO 2 lamellae. X-ray diffraction (XRD), scanning electron microscopy (SEM) and N2 adsorption - desorption of the prepared samples were characterized. Parameters such as reaction temperature, reactant concentration on the morphology and crystallinity, and preliminary proposed titanium dioxide lamellae formation mechanism. Experimental results show that the synthesis of TiO 2 lamellae photocatalytic performance is slightly better than Degussa P25. The study found that by controlling the reaction temperature can be synthesized in a one-dimensional dioxide, small addition of Co metal ions contribute to the low-temperature synthesis of one-dimensional dioxide. 2. Tetrabutoxide hydrolyzate as precursors in different media (water and different concentrations of NaOH) hydrothermal prepared TiO 2 photocatalyst in alkali concentration of 10M NaOH medium water thermal reaction TiO 2 powder mixed polymorph having a good photocatalytic performance of the photocatalytic performance testing found that the higher the catalytic activity of the water as a medium prepared sample light on the calcined samples. 3. As precursor Tetrabutoxide, and hydrofluoric acid (HF)-assisted hydrothermal method step synthesis of high catalytic activity of anatase phase TiO 2 particles. The results show that: the synthesis of anatase TiO 2 average particle size of approximately 20 ~ 30μm, the reaction time of 30 min methyl orange degradation rate can reach more than 95%, significantly better than Degussa P25, and this micron particles only through natural sedimentation can solid-liquid separation, which will help to be recycled and used.

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic > Catalyst
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