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<p>The current study reports the synthesis of α-MoO<sub>3</sub> core-shell nanocarbons using Virgin Coconut Oil or MoO<sub>3</sub>NPs (VCO) as the reducing agent through a sustainable green method. Based on the structural and morphological analysis, the unique core-shell architecture is formed, with an average crystallite size of 10.72&#xa0;nm (XRD) for the orthorhombic α-MoO<sub>3,</sub> and an average particle size of 24.98&#xa0;nm (SEM). The difference between these dimensions approves shell thickness of 7.13&#xa0;nm from the organic shell derived from VCO. The successful incorporation of this carbonaceous matrix was further verified by EDX analysis, which indicated a high carbon content of 53.50%. The indirect bandgap of 4.27&#xa0;eV was found to be unusually large by UV-Vis spectroscopy, which is believed to be due to the quantum confinement effect and surface passivation from the organic capping layer of VCO. The synthesized nanoparticles ( ranging from 10 to 25&#xa0;nm) showed excellent dual-functional performance towards environmental remediation. The degradation efficiency increased from 76.5% to 96.8% with catalyst dosage of 100&#xa0;mg/L to 500&#xa0;mg/L of the catalyst respectively for Congo Red dye. The MoO<sub>3</sub>NPs (VCO) were found to be more sensitive to Malachite Green with at 100&#xa0;mg/L to get 96.68% degradation. supported by Urbach energy of 0.44&#xa0;eV, promoting sub-bandgap solar harvesting. In addition, the MoO<sub>3</sub>NPs (VCO) were able to respond as a sensitive colorimetric sensor towards toxic heavy metals, where as a shift of 185&#xa0;nm was observed in the presence of As<sup>3+</sup>, and a hypochromic shift, along with peak broadening at 245&#xa0;nm, was observed in the presence of Cd<sup>2+</sup> ions. This research offers a new mechanistic insight into the tuning of the electronic and catalytic properties of MoO<sub>3</sub>NPs using Medium Chain Fatty Acids (MCFAs) for advanced wastewater treatment and environmental monitoring.</p>

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Synergistic effect of carbonaceous capping on the bandgap tuning of α-MoO3NPs for rapid photocatalysis and colorimetric sensing of As3+ and Cd2+

  • 期刊论文

  • 发表日期：

    2026年6月18日

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  • Shivani Rauthan,
  • Ajay Singh

摘要

The current study reports the synthesis of α-MoO3 core-shell nanocarbons using Virgin Coconut Oil or MoO3NPs (VCO) as the reducing agent through a sustainable green method. Based on the structural and morphological analysis, the unique core-shell architecture is formed, with an average crystallite size of 10.72 nm (XRD) for the orthorhombic α-MoO3, and an average particle size of 24.98 nm (SEM). The difference between these dimensions approves shell thickness of 7.13 nm from the organic shell derived from VCO. The successful incorporation of this carbonaceous matrix was further verified by EDX analysis, which indicated a high carbon content of 53.50%. The indirect bandgap of 4.27 eV was found to be unusually large by UV-Vis spectroscopy, which is believed to be due to the quantum confinement effect and surface passivation from the organic capping layer of VCO. The synthesized nanoparticles ( ranging from 10 to 25 nm) showed excellent dual-functional performance towards environmental remediation. The degradation efficiency increased from 76.5% to 96.8% with catalyst dosage of 100 mg/L to 500 mg/L of the catalyst respectively for Congo Red dye. The MoO3NPs (VCO) were found to be more sensitive to Malachite Green with at 100 mg/L to get 96.68% degradation. supported by Urbach energy of 0.44 eV, promoting sub-bandgap solar harvesting. In addition, the MoO3NPs (VCO) were able to respond as a sensitive colorimetric sensor towards toxic heavy metals, where as a shift of 185 nm was observed in the presence of As3+, and a hypochromic shift, along with peak broadening at 245 nm, was observed in the presence of Cd2+ ions. This research offers a new mechanistic insight into the tuning of the electronic and catalytic properties of MoO3NPs using Medium Chain Fatty Acids (MCFAs) for advanced wastewater treatment and environmental monitoring.