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Photocatalytic Treatment of Azo based Textile Pollutants by Modified Bismuth Vanadate

Hekmat, Amir | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54103 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Vossoughi, Manoochehr; Ghasemi, Shahnaz
  7. Abstract:
  8. In recent years, because of the increase in population and more accessibility of health facilities for people, an increase has occurred in water resources consumption. Recycling water has become so much valuable as the freshwater of the world is limited. Besides the advantages of treated water has for people, discharging the untreated wastewater to the rivers could cause many problems for human health. Many kinds of pollutions, such as textile effluent, are not easy to be treated by traditional methods because of their resistance to them. As these types of wastewater have severe negative effects on living things (both humans and animals), new treatment technologies should be considered. The application of photocatalyst, which is considered as an advanced oxidation process, is very beneficial in removing these kinds of pollutions from water. As these materials are exposed to light, they can generate free radicals and degrade the pollutant. As these materials can be activated by the light, providing the proper source of light is a necessary step in this process.In this research, the BiVO4 photocatalyst is synthesized, which can be activated by visible light. However, there is a problem with its low efficiency during the process. In this study, it has been tried to improve this photocatalyst by using an ionic liquid, which is considered as a green solvent, and metal organic frameworks (MIL-100(Fe)) with the aim of improving its activity during the visible light. First, synthesized Bismuth vanadate was calcinated under the temperatures of 400°C, 500°C, 600°C and 700°C for reaching a better molecule structure. All synthesized samples were characterized by XRD, DRS, SEM, and EDS analysis for evaluating their structures and validating them. Then, in the next step, the best of these four samples, which was a calcinated sample under the 600°C was selected for enhancing its characteristics. In order to this, Bismuth vanadate structure was modified by using different mass fractions of Fe (0.02, 0.04, 0.08, and 0.16) beside Trimesic acid through the hydrothermal method. These samples were characterized again for the second time by DRS, SEM, and EDS, and the results were analyzed. The results indicated a significant change in photocatalytic activity. Moreover, the best sample was the one with the mass fraction of Fe equal to 0.08 on calcinated Bismuth vanadate under the 600°C. This sample was able to remove 80 percent of the Basic Red 46 from water
  9. Keywords:
  10. Photocatalyst ; Bismuth Vanadate ; Azo Dyes ; Dye Pollutants ; Textile Effluent ; Photocatalytic Dye Degradation

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