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<p>This study investigates the biomass waste from Acacia auriculiformis leaves as a sustainable precursor to synthesize Eco-graphite (Eco-G) at low temperatures without chemical additives. Eco-G was oxidized, reduced to obtain reduced graphene oxide (rGO), and was further combined with MoO<sub>3</sub> at 1, 3, and 6 wt% ratios. Structural and compositional characterizations by XRD, Raman, FTIR, FESEM, and HRTEM confirmed the successful formation of orthorhombic MoO<sub>3</sub> and its rGO composites. UV-Vis DRS analysis showed that the bandgap decreased from 2.86&#xa0;eV for pure MoO<sub>3</sub> to 2.71&#xa0;eV for rGO-MoO<sub>3</sub> nanocomposite, enhancing visible light absorption. Photocatalytic tests demonstrated effective methylene blue degradation under sunlight, with the 3 wt% rGO-MoO<sub>3</sub> achieving 93% of dye removal. Scavenger experiments indicated that superoxide radicals (<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({\text{O}}_{2}^{.-}\)</EquationSource> </InlineEquation>) were the primary active species responsible for dye degradation. Recyclability studies across five cycles confirmed the excellent stability and reusability of 3 wt% rGO-MoO<sub>3</sub> composite as an efficient photocatalyst for treating organic pollutants.</p>

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Upcycling Acacia auriculiformis leaf waste into Eco- Graphite: A sustainable route to high-performance rGO-MoO3 photocatalysts

  • 期刊论文

  • 发表日期：

    2026年3月19日

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  • P. Princeya Mary,
  • M. Kumaresavanji,
  • P. Sundara Venkatesh,
  • N. Kannan,
  • P. Ragupathy,
  • V. Vasumathi

摘要

This study investigates the biomass waste from Acacia auriculiformis leaves as a sustainable precursor to synthesize Eco-graphite (Eco-G) at low temperatures without chemical additives. Eco-G was oxidized, reduced to obtain reduced graphene oxide (rGO), and was further combined with MoO3 at 1, 3, and 6 wt% ratios. Structural and compositional characterizations by XRD, Raman, FTIR, FESEM, and HRTEM confirmed the successful formation of orthorhombic MoO3 and its rGO composites. UV-Vis DRS analysis showed that the bandgap decreased from 2.86 eV for pure MoO3 to 2.71 eV for rGO-MoO3 nanocomposite, enhancing visible light absorption. Photocatalytic tests demonstrated effective methylene blue degradation under sunlight, with the 3 wt% rGO-MoO3 achieving 93% of dye removal. Scavenger experiments indicated that superoxide radicals ( \({\text{O}}_{2}^{.-}\) ) were the primary active species responsible for dye degradation. Recyclability studies across five cycles confirmed the excellent stability and reusability of 3 wt% rGO-MoO3 composite as an efficient photocatalyst for treating organic pollutants.