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Understanding triethylammonium hydrogen sulfate ([TEA][HSO4]) pretreatment induced changes in Pennisetum polystachion cell wall matrix and its implications on biofuel yield

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  • Poolakkalody, Najya Jabeen
  • Ramesh, Kaviraj
  • Palliprath, Suchithra
  • Nittoor, Shima Namath
  • Santiago, Rogelio
  • Kabekkodu, Shama Prasada
  • Manisseri, Chithra

Abstract

Biofuel potential of a widely grown perennial grass, Pennisetum polystachion, was analyzed using triethylammonium hydrogen sulfate ([TEA][HSO4]) pretreatment. The optimum pretreatment condition was selected based on the delignification efficiency. 80% [TEA][HSO4] at 140 °C for 45 min at 10% sample load, yielding high delignification rate (65.8%) was selected as the optimum pretreatment condition. Recycling of [TEA][HSO4] showed up to 90% IL recovery and significant delignification rates. Glucan yield in the biomass increased to 67.8%, whereas digestibility of biomass enhanced from 16.7% to 84.1%. Extensive deferuloylation (88%) and decoumarylation (86.4%) were observed in the sample following pretreatment. Diferulic acids were not detected in pretreated samples indicating their complete removal. HMF (0.1 mg/mL) and furfural (0.001 mg/mL) produced during pretreatment were very low compared to conventional methods. FTIR and XRD confirmed pronounced delignification and hemicellulose dissolution, and FESEM showed a marked difference in the surface morphology, including defibrillation and enhanced porosity. An ethanol yield of 275 mg/g biomass (84.7% of theoretical maxima) was achieved using Saccharomyces cerevisiae MTCC 36 after 15 h of fermentation. The results obtained from the current study can shed light on utilizing P. polystachion as a potential biofuel feedstock using a low-cost ionic liquid [TEA][HSO4].

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  • Poolakkalody, Najya Jabeen & Ramesh, Kaviraj & Palliprath, Suchithra & Nittoor, Shima Namath & Santiago, Rogelio & Kabekkodu, Shama Prasada & Manisseri, Chithra, 2023. "Understanding triethylammonium hydrogen sulfate ([TEA][HSO4]) pretreatment induced changes in Pennisetum polystachion cell wall matrix and its implications on biofuel yield," Renewable Energy, Elsevier, vol. 209(C), pages 420-430.
    • Handle: RePEc:eee:renene:v:209:y:2023:i:c:p:420-430
    DOI: 10.1016/j.renene.2023.04.008
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    References listed on IDEAS

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    1. Pin, Thaynara C. & Nakasu, Pedro S.Y. & Rabelo, Sarita C. & Costa, Aline C., 2021. "Structural features of protic ionic liquids and their impact on pretreatment performance for 2G ethanol production," Energy, Elsevier, vol. 235(C).
    2. Bala, Anju & Singh, Bijender, 2019. "Development of an environmental-benign process for efficient pretreatment and saccharification of Saccharum biomasses for bioethanol production," Renewable Energy, Elsevier, vol. 130(C), pages 12-24.
    3. Lee, Ilgyu & Yu, Ju-Hyun, 2021. "Design of hydrothermal and subsequent lime pretreatment for fermentable sugar and bioethanol production from acacia wood," Renewable Energy, Elsevier, vol. 174(C), pages 170-177.
    4. Kumar, Sanjoy & Ghosh, Prosenjit, 2018. "Sustainable bio-energy potential of perennial energy grass from reclaimed coalmine spoil (marginal sites) of India," Renewable Energy, Elsevier, vol. 123(C), pages 475-485.
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