Novel S-scheme derived Mo–Bi2WO6/WO3/Biochar composite for photocatalytic removal of Methylene Blue dye

• Published in: The Journal of physics and chemistry of solids Vol. 196; p. 112385
• Main Authors: Rana, Anchal, Sonu, Sonu, Soni, Vatika, Chawla, Akshay, Sudhaik, Anita, Raizada, Pankaj, Ahamad, Tansir, Thakur, Pankaj, Thakur, Sourbh, Singh, Pardeep
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-01-2025
• Subjects: Enhanced electron-hole separation; Heterojunction formation; Methylene Blue dye mitigation; Mo-doped Bi2WO6/WO3/Biochar; S-scheme; Mo-doped Bi2WO6/WO3/Biochar; S-scheme; Methylene Blue dye mitigation; Enhanced electron-hole separation; Heterojunction formation
• ISSN: 0022-3697
• DOI: 10.1016/j.jpcs.2024.112385

Presently, the distinct charge transport and interface interaction of the S-scheme heterojunction has garnered significant interest. Herein, a S-scheme-based charge transportation Mo-doped Bi2WO6/WO3/Biochar heterojunction was synthesized in situ using a coprecipitation technique to improve methylene blue adsorption and photocatalytic reactive oxygen species production. The doped Mo altered the band gap of Bi2WO6 to increase light absorption, which can facilitate electron-hole separation and transfer. Likewise, the S-scheme band structure improved sunlight utilization, enhanced the reduction and oxidation power of photogenerated electrons, and boosted charge carrier separation and transfer. Thus, due to the synergetic impact of doping and the S scheme band structure, the photocatalysts efficiently eliminated Methylene blue up to 87.5 % in 30 min of photoirradiation. Fabricated heterojunction Mo–Bi2WO6/WO3/Biochar photocatalyst have highest Kapp values 0.02816 min−1 while Mo–Bi2WO6/WO3, Mo–Bi2WO6, Bi2WO6, and WO3 photocatalysts have 0.02816, 0.02273, 0.01527, 0.00643, and 0.00735 min−1, respectively which was 4.38 times greater than pristine Bi2WO6. The study offers a novel perspective for the in-situ production of S-scheme heterojunction with doping to remove different types of contaminants.
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•Fabrication of MO-doped Bi2WO6/WO3/Biochar heterojunction through Coprecipitation process.•Doping of Mo on Bi2WO6 for enhanced photocatalytic activity.•S-scheme degradation Mechanism followed for MB dye degradation.•87.5 % MB removal within 30 min of light irradiation.•●OH and ●O2− are reactive species for MB removal.