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Pereparation, Characterization and Photocatalytic Application of Some Polyoxometalates in Degradation of Oraganic Pollutants

Ahmadpour, Zahra | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46427 (03)
  4. University: Sharif University of Technology
  5. Department: Chemistry Science
  6. Advisor(s): Rahman Setayesh, Shahrbanoo
  7. Abstract:
  8. In this project photocatalysts TiO2, H3PW12O40, H3PMo6W6O40, H3PW12O40 / TiO2, H3PMo6W6O40 / TiO2, K2.5H0.5PW12O40, Cs2.5H0.5PW12O40, (NH4) 2.5H0.5PW12O40 and H3PW12O40 / M-TiO2 that M = La , Ce, Cr, Fe, Co were characterized by techniques DRS, FT-IR, BET, 31P NMR, SEM and XRD. The results of SEM and XRD particle size and page crystalline nanoscale catalysts, with size less than 40nm, respectively. FT-IR analysis confirmed the structure of heteropolyacid was produced. DRS analysis of the degradation reactions during wavelenght longer upheld. Degradation of methylene blue and pollutants such as Tinopal CBS-x to the polyoxometalates keggin is homogeneous and composite titanium dioxide two forms were used. Degradation and reaction kinetics parameters influencing the reaction kinetics, including the effects of POM, catalyst concentration, effect of pH, dye concentration, and the presence of lanthanides and transition metals on the rate of degradation color and Tinopal CBS-x was investigated. The effect of alkali salts hetropoly acids, such as cesium, potassium and ammonium on the reaction rate of degradation of paint and Tinopal CBS-x was investigated. The kinetics of degradation reactions in the project all the catalysts mentioned above and also rate constants were calculated
  9. Keywords:
  10. Reaction Kinetics ; Photocatalyst ; Titanium Dioxide ; Polyoxometalates ; Methylene Blue ; Degradation Pollutants

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