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Enhancement of lignin removal and enzymolysis of sugarcane bagasse by ultrasound-assisted ethanol synergized deep eutectic solvent pretreatment

Author

Listed:
  • Ji, Qinghua
  • Yu, Xiaojie
  • Yagoub, Abu ElGasim A.
  • Chen, Li
  • Mustapha, Abdullateef Taiye
  • Zhou, Cunshan

Abstract

A low-cost and green biorefinery will increase the economy and revenue from lignocellulosic biomass. This study demonstrated the effect of two-pot sequential pretreatment, comprising of ultrasound ethanol (USEL) synergized ternary deep eutectic solvent (TDES, choline chloride: glycerol: FeCl3·6H2O), with the aim to investigate the effects of USEL, TDES, and USEL + TDES pretreatments on enhancing delignification of sugarcane bagasse (SCB). The results showed that under the optimum TDES pretreatment conditions (FeCl3·6H2O, 120 °C, 3 h), the cellulose content and lignin removal rate (LRR) of SCB reached 47.67 and 82.71%, respectively. Under the optimum synergy conditions (USEL conditions: 100% ethanol, 20 + 28 + 40 kHz, 240 W, 60 min; TDES conditions: FeCl3·6H2O, 120 °C, 3 h), the cellulose content and LRR of SCB reached 66.17 and 86.39%, respectively. After enzymatic hydrolysis, the SCB pretreated with USEL + TDES shows a saccharification rate of 90.31%, which was substantially higher than that of the SCB pretreated with TDES alone (85.68%). X-ray diffraction, particle size, brunauer-emmet-teller, scanning electron microscopy, and optical microscopy analyses were conducted to confirm the efficiency of USEL + TDES on pretreating SCB. Meanwhile, 2D-HSQC NMR analysis revealed that regenerated lignin exhibited well-preserved structures (β-O-4, β-β linkages), making it suitable for depolymerization into monoaromatic compounds. Overall, this work demonstrated that biomass pretreatment with the USEL + TDES was promising for a low-cost biorefinery to efficiently fractionate lignocellulosic biomass into glucose and high-quality lignin with tailored chemical structures.

Suggested Citation

  • Ji, Qinghua & Yu, Xiaojie & Yagoub, Abu ElGasim A. & Chen, Li & Mustapha, Abdullateef Taiye & Zhou, Cunshan, 2021. "Enhancement of lignin removal and enzymolysis of sugarcane bagasse by ultrasound-assisted ethanol synergized deep eutectic solvent pretreatment," Renewable Energy, Elsevier, vol. 172(C), pages 304-316.
    • Handle: RePEc:eee:renene:v:172:y:2021:i:c:p:304-316
    DOI: 10.1016/j.renene.2021.03.050
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    References listed on IDEAS

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    1. Dong, Cuiying & Chen, Juan & Guan, Ruolin & Li, Xiujin & Xin, Yuefeng, 2018. "Dual-frequency ultrasound combined with alkali pretreatment of corn stalk for enhanced biogas production," Renewable Energy, Elsevier, vol. 127(C), pages 444-451.
    2. Ong, Victor Zhenquan & Wu, Ta Yeong, 2020. "An application of ultrasonication in lignocellulosic biomass valorisation into bio-energy and bio-based products," Renewable and Sustainable Energy Reviews, Elsevier, vol. 132(C).
    3. Ji, Qinghua & Jiang, Haonan & Yu, Xiaojie & Yagoub, Abu El-Gasim A. & Zhou, Cunshan & Chen, Li, 2020. "Efficient and environmentally-friendly dehydration of fructose and treatments of bagasse under the supercritical CO2 system," Renewable Energy, Elsevier, vol. 162(C), pages 1-12.
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    2. Ouyang, Denghao & Chen, Hongmei & Liu, Nan & Zhang, Jingzhi & Zhao, Xuebing, 2022. "Insight into the negative effects of lignin on enzymatic hydrolysis of cellulose for biofuel production via selective oxidative delignification and inhibitive actions of phenolic model compounds," Renewable Energy, Elsevier, vol. 185(C), pages 196-207.
    3. Fan, Meishan & Lei, Ming & Xie, Jun & Zhang, Hongdan, 2022. "Further insights into the solubilization and surface modification of lignin on enzymatic hydrolysis and ethanol production," Renewable Energy, Elsevier, vol. 186(C), pages 646-655.
    4. Zhou, Man & Fakayode, Olugbenga Abiola & Ahmed Yagoub, Abu ElGasim & Ji, Qinghua & Zhou, Cunshan, 2022. "Lignin fractionation from lignocellulosic biomass using deep eutectic solvents and its valorization," Renewable and Sustainable Energy Reviews, Elsevier, vol. 156(C).
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    6. Xie, Junxian & Cheng, Zheng & Zhu, Shiyun & Xu, Jun, 2022. "Lewis base enhanced neutral deep eutectic solvent pretreatment for enzymatic hydrolysis of corn straw and lignin characterization," Renewable Energy, Elsevier, vol. 188(C), pages 320-328.
    7. You, Shuai & Zhang, Wen-Xin & Ge, Yan & Lu, Yu & Herman, Richard Ansah & Chen, Yi-Wen & Zhang, Sheng & Hu, Yang-Hao & Bai, Zhi-Yuan & Wang, Jun, 2023. "Improvement of GH10 xylanase activity based on channel hindrance elimination strategy for better synergistic cellulase to enhance green bio-energy production," Renewable Energy, Elsevier, vol. 215(C).
    8. Lu, Aiping & Yu, Xiaojie & Chen, Li & Okonkwo, Clinton Emeka & Otu, Phyllis & Zhou, Cunshan & Lu, Qiaomin & Sun, Qiaolan, 2023. "Development of novel ternary deep eutectic pretreatment solvents from lignin-derived phenol, and its efficiency in delignification and enzymatic hydrolysis of peanut shells," Renewable Energy, Elsevier, vol. 205(C), pages 617-626.

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