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Synthesis and Optimization of Novel Ti containing Photocatalysts for 4-Nitrophenol Removal from Aqueous Environment

Kaveh, Arman | 2025

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 58294 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Ghotbi, Siroos; Larimi, Afsaneh Sadat; Asgharinezhad, Ali Akbar
  7. Abstract:
  8. In recent years, providing clean water and addressing pollution caused by toxic organic compounds—especially phenolic compounds—have become major global challenges. Among these hazardous pollutants, 4-nitrophenol (4-NP) is of particular concern due to its high toxicity and carcinogenic potential, making it a priority for removal from water sources. In this study, two types of nanocomposites photocatalysts, including titanium dioxide nanotubes (TNT) and titanium dioxide nanodandelions (TND) doped with 5 wt% bismuth vanadate (BiVO4), were synthesized and applied for the photocatalytic degradation of 4-NP under visible light irradiation. To identify the structural and surface characteristics of the catalysts, various techniques such as XRD, FTIR, UV-Vis, DRS, PL, FESEM and EDX were employed, all of which confirmed the successful synthesis of the nanocomposites. To achieve the highest removal efficiency, parameters such as pH, catalyst dosage, initial pollutant concentration, and the amount of H2O2 were investigated and optimized. Under the optimal conditions (pH = 3, catalyst dosage = 30 mg, initial 4-NP concentration = 10 mg/L, H2O2 volume = 0.5 mL), the 5% BiVO4–TND photocatalyst was able to degrade more than 93% of 4-NP within 150 minutes. In contrast, the 5% BiVO4–TNT photocatalyst achieved a degradation efficiency of 62% under its respective optimal conditions (pH = 2, catalyst dosage = 60 mg, initial 4-NP concentration = 10 ppm, H2O2 volume = 0.5 mL). Furthermore, recyclability tests showed that the degradation efficiency after five cycles remained above 80% for the 5% BV–TND sample and above 40% for the 5% BV–TNT sample. These results indicate the higher stability and superior performance of the BiVO4–TND photocatalyst in treating water contaminated with phenolic compounds
  9. Keywords:
  10. Bismuth Vanadate ; Titanium Dioxide ; 4-Nitrophenol ; Photocatalytic Degradation ; Organic Pollutant

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