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<p>Valorization of lignocellulosic biomass for clean, green, and sustainable energy production may represent an effective approach not only for developing a potential alternative to rapidly depleting fossil fuels but also for an operative waste management strategy. Different metallic oxide nanoparticles (NPs) (Fe₂O₃, Fe₃O₄, CoO, MnO₂, or CuO) were evaluated for their impact on the pretreatment efficacy of ionic liquid (IL), [TMA]MeSO₄ for sugarcane tops (SCT) biomass, and for yeast mediated ethanolic fermentation of sugars, to augment the overall bioconversion efficiency. Appropriately pretreated biomass (IL in combination with either of the NPs) was hydrolysed with <i>in-house</i> developed IL-tolerant cellulase and xylanase derived from <i>Aspergillus flavus</i> PN3. A combined pretreatment based on IL and CoO NPs increased the sugar yield significantly (159.59&#xa0;mg/g SCT biomass) upon enzymatic hydrolysis as compared to only IL pretreatment (77.28&#xa0;mg/g). Optimization of CoO NPs concentration (1.0% w/v) further boosted the sugar yield (197.39&#xa0;mg/g). Subsequently, the examination of impact of NPs on ethanolic fermentation of sugars showed that addition of CuO NPs enhanced the ethanol yield considerably i.e. from 74.23&#xa0;mg/g (control) to 96.69&#xa0;mg/g SCT biomass. Analysis of morphological/structural characteristics of CoO and CuO NPs by scanning electron microscopy–energy dispersive X-ray spectroscopy (SEM-EDX) and Fourier transform infrared spectroscopy (FTIR) provide an insight into their catalytic functional mechanism. The study demonstrates that the integrated application of nanotechnology may be a promising strategy for efficient biomass conversion to biofuel. However, further in-depth investigation on the functional mechanisms of NPs for enhancing IL-pretreatment and ethanol fermentation, and scale up studies must be executed.</p>

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Catalytic potential of metallic oxide nanoparticles for enhancing the ionic liquid mediated bioconversion of sugarcane tops biomass to biofuel-ethanol

  • 期刊论文

  • 发表日期：

    2025年11月21日

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  • Surbhi Sharma,
  • Nancy Nancy,
  • Arpana Thakur,
  • Muskaan Chib,
  • Nisha Kapoor,
  • Ritu Mahajan,
  • Bijender Kumar Bajaj

摘要

Valorization of lignocellulosic biomass for clean, green, and sustainable energy production may represent an effective approach not only for developing a potential alternative to rapidly depleting fossil fuels but also for an operative waste management strategy. Different metallic oxide nanoparticles (NPs) (Fe₂O₃, Fe₃O₄, CoO, MnO₂, or CuO) were evaluated for their impact on the pretreatment efficacy of ionic liquid (IL), [TMA]MeSO₄ for sugarcane tops (SCT) biomass, and for yeast mediated ethanolic fermentation of sugars, to augment the overall bioconversion efficiency. Appropriately pretreated biomass (IL in combination with either of the NPs) was hydrolysed with in-house developed IL-tolerant cellulase and xylanase derived from Aspergillus flavus PN3. A combined pretreatment based on IL and CoO NPs increased the sugar yield significantly (159.59 mg/g SCT biomass) upon enzymatic hydrolysis as compared to only IL pretreatment (77.28 mg/g). Optimization of CoO NPs concentration (1.0% w/v) further boosted the sugar yield (197.39 mg/g). Subsequently, the examination of impact of NPs on ethanolic fermentation of sugars showed that addition of CuO NPs enhanced the ethanol yield considerably i.e. from 74.23 mg/g (control) to 96.69 mg/g SCT biomass. Analysis of morphological/structural characteristics of CoO and CuO NPs by scanning electron microscopy–energy dispersive X-ray spectroscopy (SEM-EDX) and Fourier transform infrared spectroscopy (FTIR) provide an insight into their catalytic functional mechanism. The study demonstrates that the integrated application of nanotechnology may be a promising strategy for efficient biomass conversion to biofuel. However, further in-depth investigation on the functional mechanisms of NPs for enhancing IL-pretreatment and ethanol fermentation, and scale up studies must be executed.