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Improving the Activity and Efficiency of Tungstate Bismuth (Bi2WO6)-Based Photocatalysts in Removing Water Pollutants

Peyrovi, Mohammad Reza | 2025

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57812 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): khorasheh, Farhad; Ghasemi, Shahnaz
  7. Abstract:
  8. This research aimed to develop materials that can degrade organic pollutants and industrial dyes in water under visible light irradiation. In this study, an efficient material was prepared by combining bismuth tungstate (Bi2WO6), an organic polymer semiconductor called g-C3N4, and a metal-organic framework MIL-100(Fe). This combination was designed to have optimal performance in light absorption and pollutant degradation. A simple hydrothermal method was used to fabricate this material, which resulted in the formation of a ternary structure with specific properties. This structure includes bonds through which electrons generated when light is irradiated are rapidly transferred to different regions of the material, making the material effective in pollutant degradation. Investigations conducted with various scientific techniques such as X-ray diffraction, electron microscopy, and advanced spectroscopy showed that this material has a suitable combination of structure, surface area, and porosity. Experimental studies have shown that when Bi2WO6 is combined with 70 wt% g-C3N4, its activity for degrading textile dyes increases significantly. This combination can degrade pollutants faster due to its higher absorption of visible light and the creation of active sites for chemical reactions. The addition of MIL-100(Fe) also increases the specific surface area of the material, which is effective in increasing the light absorption range. The addition of this organic material also helps to better and more adsorb pollutants and makes the degradation more efficient. In addition, the special structure of this material, which is designed based on a design called "heterojunction with dual Z-Scheme schematic", has other advantages. This design helps to reduce the return or recombination of electrons and holes (which usually reduces the performance of materials). As a result, the electrons released during light irradiation can remain active for a longer time and participate in the process of pollutant degradation. Tests conducted on this material showed that under laboratory conditions, the industrial dye Reactive Blue 4 was degraded by up to 94% in an aqueous environment within 120 minutes under visible light irradiation. Also, the material maintained its high performance after three recycling cycles, showing that it is also an economically viable option. In the degradation process, •OH radicals and h+ holes were identified as the main reaction agents. Finally, this research showed that the innovative combination of Bi2WO6, g-C3N4 and MIL-100(Fe) can be used as an efficient photocatalyst for the removal of organic pollutants in water treatment systems. This material not only has high efficiency, but also is simple and cost-effective to manufacture and shows reliable performance in terms of stability
  9. Keywords:
  10. Visible Light ; Metal-Organic Framework ; Advanced Oxidation Process ; Bismuth Tungstate Potocatalyst ; Dye Pollutants ; Dual Z-Scheme Photocatalyst ; Visible Light Responsive

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