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Reduction of Organic Dyes in Water Using MOFS and Their Composites

Mohammadi, Alireza | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55849 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Kazemeini, Mohammad; Sadjadi, Samahe; Khorasheh, Farhad
  7. Abstract:
  8. A triple photocatalytic composite of biochar, metal-organic framework and phosphomolybdic acid was prepared through solvothermal treatment of iron (III) chloride hexahydrate, terephthalic acid, lavandulifolia-derived biochar and phosphomolybdic acid. The composite was thoroughly characterized and utilized for photodegradation of organic dyes under visible light irradiation. Investigations of reaction variables confirmed that, the highest yield of 96.2% for a cationic Rhodamine-B (RhB) dye was achieved at ambient temperature when using 0.07 g of catalyst at pH of 7 and a dye concentration of 10 ppm. The activity of the composite was superior compared to its individual components implying synergism existed between them. To show the applicability range of the synthesized composite, under the optimum conditions determined for the cationic RhB degradation, the anionic Methyl orange (MO) dye removal was also understudied. It was proven that this composite was highly appropriate for the latter dye as well resulting in 93% removal of it. In addition, the kinetic and thermodynamic parameters were determined. It was revealed that, the photodegradation followed a pseudo-first-order kinetic with no mass transfer limitations. Moreover, a corresponding chemical mechanism for this process was suggested. Ultimately, the catalyst was reused for five consecutive cycles with a loss of around 25% activity
  9. Keywords:
  10. Photocatalyst ; Metal-Organic Framework ; Heteropoly Acide Catalyst ; Biochar ; Dye Degradation ; Organic Dyes Degradation ; Dye Pollutants

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