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<p>Heterostructure nanocomposites of Bi<sub>2</sub>MoO<sub>6</sub>/g-C<sub>3</sub>N<sub>4</sub> (BMG) were synthesized via a precisely regulated hydrothermal process to improve the visible-light-driven&#xa0;degradation of persistent food dyes, specifically Carmoisine (CM) and Indigo Carmine (IC). The successful fabrication of the heterojunction was confirmed by thorough analysis using XRD, FT-IR, XPS, BET, UV–Vis DRS, PL, FE-SEM, TEM, and EDX, which also showed notable changes in surface, structural, and optical properties. According to photocurrent response and EIS analyses, the development of a close interface between Bi<sub>2</sub>MoO<sub>6</sub> (BM) and exfoliated g-C<sub>3</sub>N<sub>4</sub> (GCN) promoted effective charge separation and significantly decreased recombination occurrences. The primary reactive oxygen species in charge of the photodegradation process were determined to be <sup>•</sup>OH and <sup>•</sup>O<sub>2</sub>⁻ by radical scavenging studies and EPR measurements. By adjusting the variation in&#xa0;pH, dye concentration, catalyst dosage, and light intensity, the&#xa0;BMG (7 wt%)&#xa0;composite showed significantly greater rates of degradation than pristine&#xa0;BM and bare GCN, indicating enhanced photocatalytic performance. A more effective interfacial charge-transfer channel, increased accessible surface area, and improved visible-light absorption all work together to produce the increased catalytic activity. These results demonstrate the potential of BMG heterojunctions as strong and effective visible-light photocatalysts, offering a practical and environmentally friendly approach for removing dye contaminants from wastewater.</p>

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Bi2MoO6/g-C3N4 nanocomposites with improved charge separation for effective food dye degradation under visible light

  • 期刊论文

  • 发表日期：

    2026年3月11日

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  • Silpa Sunil,
  • Srinivasan Latha,
  • Badal Kumar Mandal

摘要

Heterostructure nanocomposites of Bi2MoO6/g-C3N4 (BMG) were synthesized via a precisely regulated hydrothermal process to improve the visible-light-driven degradation of persistent food dyes, specifically Carmoisine (CM) and Indigo Carmine (IC). The successful fabrication of the heterojunction was confirmed by thorough analysis using XRD, FT-IR, XPS, BET, UV–Vis DRS, PL, FE-SEM, TEM, and EDX, which also showed notable changes in surface, structural, and optical properties. According to photocurrent response and EIS analyses, the development of a close interface between Bi2MoO6 (BM) and exfoliated g-C3N4 (GCN) promoted effective charge separation and significantly decreased recombination occurrences. The primary reactive oxygen species in charge of the photodegradation process were determined to be •OH and •O2⁻ by radical scavenging studies and EPR measurements. By adjusting the variation in pH, dye concentration, catalyst dosage, and light intensity, the BMG (7 wt%) composite showed significantly greater rates of degradation than pristine BM and bare GCN, indicating enhanced photocatalytic performance. A more effective interfacial charge-transfer channel, increased accessible surface area, and improved visible-light absorption all work together to produce the increased catalytic activity. These results demonstrate the potential of BMG heterojunctions as strong and effective visible-light photocatalysts, offering a practical and environmentally friendly approach for removing dye contaminants from wastewater.