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Comparative Study on Pretreatment Processes for Different Utilization Purposes of Switchgrass.

Fan Wang1,2, Dongxiang Shi1,3, Ju Han1,2

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Switchgrass pretreatment using sodium hydroxide, nitric acid, or ethanol organosolv offers pathways for biofuels, nanocellulose, and papermaking. Nitric acid pretreatment is optimal for nanocellulose production.

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Area of Science:

  • Biomass Conversion
  • Plant Science
  • Chemical Engineering

Background:

  • Switchgrass (Panicum virgatum) is a high-yield biomass crop suitable for low-input cultivation.
  • Its potential for biofuels, papermaking, and nanocellulose production is significant.
  • Optimizing pretreatment methods is crucial for efficient utilization of switchgrass.

Purpose of the Study:

  • To compare 12 chemical pretreatment methods for switchgrass utilization.
  • To identify optimal pretreatments for biofuel (fermentation), nanocellulose, and papermaking applications.
  • To characterize the structural and chemical changes in pretreated switchgrass.

Main Methods:

  • Laboratory-scale chemical pretreatments including sodium hydroxide, nitric acid, and ethanol organosolv.
  • Analysis of residual lignin, cellulose, and hemicellulose content.
  • Characterization using scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier-transform infrared spectroscopy (FT-IR).

Main Results:

  • Sodium hydroxide pretreatment yielded mixed sugars for fermentation with 11.10% residual lignin and 53.85% residual cellulose.
  • Nitric acid (2.00%, 125 °C, 30 min) effectively removed 78.37% hemicellulose and 39.82% lignin, suitable for nanocellulose.
  • Ethanol organosolv delignification resulted in 58.56% residual cellulose for papermaking.

Conclusions:

  • Different chemical pretreatments are effective for specific switchgrass applications.
  • Nitric acid and ethanol organosolv pretreatments show promise for nanocellulose and papermaking, respectively.
  • Characterization techniques confirmed structural and chemical modifications crucial for material properties.