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Preparation of Titanium Dioxide Supported Metal Oxides and a Magnetic Cu/TiO2and Their Activity in Catalytic Ozonation

Author: ShenLiang
Tutor: SongShuang
School: Zhejiang University of Technology
Course: Environmental Science
Keywords: metal oxidas TiO2 Fe3O4 magnetic core oxalic acid nitrobenzene heterogeneous catalytic ozonation
CLC: X703
Type: Master's thesis
Year: 2013
Downloads: 82
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Abstract


In an attempt to utilize ozone more effectively, a series of titanium dioxide supported metal oxides was prepared via incipient wetness impregnation using Fe(NO3)3·9H2O Mn(NO3)2·4H2O and Cu(NO3)2·3H2O as the precursors. The structure and properties of the catalysts were studied by the Brunauer-Emmett-Teller(BET)method and X-ray diffraction (XRD). Catalytic activity was evaluated by monitoring the degradation of oxalic acid (OA) and nitrobenzene (NB) in the presence of ozone. The metal oxides support on titanium dioxide can effectively enhance the ozonation activity on OA and NB removal. The pH has a great influence in degradation of NB. Overall, the initial degradation rate of OA and the TOC remove of NB is related to the initiation of OH, it is the most significant characteristic of AOPs, and found that mainly attributed to the introduction of the catalysts surface in the heterogeneous catalytic ozonation. Specifically, the surface hydroxyl groups on the heterogeneous catalytic surface, as the active surface sites, are believed to absorb the ozone and decompose ozone into-OH. After three successive recycles, the catalysts shows different catalytic stabilities, which the Cu/TiO2shows the best and Mn2O3/TiO2shows the worst. Comparing the three catalysts, a lot of data have been accumulated and found that the Cu/TiO2has the best catalytic activity and catalytic stability. Base on the above work. A series of CuO-supported titanium dioxide (Cu-TiO2) catalysts was synthesized by using silica-coated Fe3O4(SF) as the magnetic core (abbreviated here as Cu-TSF).it can be separated from the liquid. The structures of the catalysts were examined by XRD. The structure and dimensions of the core/shell Cu-TSF nanoparticles were investigated by TEM, element composition of Cu-TSF samples were determined by EDX and the magnetic properties of the prepared Fe3O4, SF and Cu-TSF particles is studied by VSM. The catalytic activity is measured by the removal of OA. After three successive recycles, the catalyst shows a good catalytic activity and catalytic stability.The efficiency of catalytic ozonation on removing OA and NB was studied. The pH, the percentages of supported metal oxides and different kinds of metal oxides were evaluated. pH is an important factor to affect the removal of NB, in order to study the effect of pH on catalytic ozonation, the degradation of NB were test in different pH solutions. During the experiment of Cu-TSF catalytic ozonation of OA, different percentages of CuO supported catalysts had been preparation in the same Ti:Fe, it found that more Cuo supports on to TiO2, the best removing rate it shows but it has a limit. But with the best CuO supported percentage, the little Ti:Fe, the best catalytic activity it shows. Cu-TSF-15%-96.7(15%stands for mole ratio Cu:Ti,96.7stands for mole rate Ti:Fe) shows the best catalytic activity and catalytic stability.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
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