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Study of ZnO Nanoparticles for the Photocatalytic Degradation of a Organic Pollutant

Zakariapour Naeini, Maryam | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47740 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Baghalha, Morteza; Ahmadpour, Ali; Khorashe, Farhad
  7. Abstract:
  8. due to high mineralization rate of Zinc oxide، chemical and physical stability, non-toxicity and low price as the most promising photocatalysts studied, although its use is not too satisfactory. Because of the wide energy gap(3.2 ev) and for photocatalytic activity needs to UV light Unfortunately, the solar spectrum is made up only 5-7% of UV light, while 46-47% is the spectrum of visible light and infrared. Doped zinc oxide nanoparticles with metal and non-metallic atoms could increase the photocatalytic properties under visible light irradiation. In this research, nanoparticles of zinc oxide was doped by fluorine as Dopant. The results showed that photocatalytic activity of the modified ZnO under the sun was better than they haven't been doped sample. Undoped and fluorine doped zinc oxide nanoparticles were successfully prepared by chemical precipitation methode. The synthesized nanoparticles were characterized using UV–visible diffuse reflectance spectroscopy (UV–vis DRS), X-ray diffraction (XRD), transmission electron spectroscopy (TEM). XRD and TEM results revealed that ZnO and F Doped ZnO have hexagonal wurtzite structure with average crystallite size of 30 nm and 25 nm، respectively. test results for the Photocatalytic degradation of organic pollutant (Congo red)under the sun with ZnO and Fluorine Doped ZnO revealed that, respectively, 53% and 97% of photodegradation.(37% and 85% COD removal). It should be noted that the effect of pH and time was studied in the process of photocatalytic degradation. Fluorine-doped ZnO optical responses extended to the visible region. In addition, the increase of fluorine reduces the energy band, which in turn increases the photocatalytic activity under visible light. Moreover, the F Doped Zno photocatalyst could be reused for four times without remarkable loss of its activity
  9. Keywords:
  10. Doping ; Degradation Pollutants ; Zinc Oxide Nanoparticles ; Nanophotocatalyst ; Dopants ; Fluorine Doping

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