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Improving the Photocatalytic Activity of Bismuth-Based Semiconductors Via Plasmonic Effects for Degradation of Non-Biodegradable Pollutants

Parastesh, Ali | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57738 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Hamzehlouyan, Tayebeh; Ghasemi, Shahnaz
  7. Abstract:
  8. The ever-growing population and the rapid industrialization in recent years have left the world with serious environmental problems such as the shortage of water resources and pollution of existing resources. This shortage and pollution not only increase the mortality rate in certain regions of the globe but could cause the industry to falter. To address this problem, water treatment facilities are a logical and possible solution. Recently, water treatment using photocatalysis has attracted much attention. This process, which requires only a semiconductor (photocatalyst) and sunlight, has low energy consumption and does not produce harmful by-products (two problems traditional water treatment methods suffer from). Studies on photocatalysts have shown that a single semiconductor does not have a high pollutant removal rate. To address this issue, combining two photocatalysts (heterojunctions) and using the plasmonic properties of noble metals are two methods sought in this research. Here, by pH control, the Bi3O4Cl/Bi12O17Cl2 heterostructure was synthesized and its morphology was improved with the help of CTAB surfactant. Then, to improve the light absorption of this Heterostructure, NaBH4 was also used. To investigate the photocatalytic efficiency of these materials, the reactions of removing the two dyes Acid Blue 92 and Reactive Blue 21 in water were investigated. The results show that the heterostructure removes 45% of the first dye in 2 hours, while for the heterostructure synthesized with CTAB, the removal rate increases to 65%, and finally the plasmonic sample with 30 mmol/lit sodium borohydride - as the best sample - removes about 80% of this dye from water. A similar trend can be seen for the Reactive Blue 21. The results of morphological and optical analyses also prove the superiority of the sample synthesized with 30 mmol/lit NaBH4
  9. Keywords:
  10. Water Treatment ; Photocatalytic Dye Degradation ; Photocatalytic Purification ; Acid-Blue 92 ; Cetrimonium Bromide (CTAB)Surfactant ; Dye Pollutants ; Reactive Blue 21 Dye ; Plasmonic Photocatalyst

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