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Two-Step Pretreatment of Corn Stover Silage Using Non-ionic Surfactant and Ferric Nitrate for Enhancing Sugar Recovery and Enzymatic Digestibility of Cellulose

  • Youshan SunEmail author
  • Xudong Gong
  • Zhiqiang Wang
  • Chao Huang
  • Xiuqin Ma
  • Meiyan Wang
Article
  • 25 Downloads

Abstract

Corn stover silage (CSS) is regarded as a promising feedstock for bioethanol production. The two-step pretreatment using a sequential non-ionic surfactant and ferric nitrate pretreatment was investigated for improving the enzymatic hydrolysis of CSS. The first-step pretreatment using non-ionic surfactant (Tween-80, 2.0 wt.%) at 60 °C for 60 min achieved 30.48% the removal of lignin. Compared with the raw material, the cellulose content of first-step treated CSS increased by 15.86%. The second step using ferric nitrate resulted in 94.56% hemicellulose removal and achieved 72.53% cellulose purity at 130 °C for 30 min, while the yields of furfural and HMF were only 0.36 and 0.32 g/100 g dry material, respectively. The maximum enzymatic digestibility of the two-step treated CSS was 90.98% with a low cellulose dosage (15 FPU/g-glucan), which was approximately 32.07% higher than that of the first-step pretreatment only with Tween-80.

Keywords

Tween-80 Ferric nitrate Two-step pretreatment Corn Stover silage Enzymatic hydrolysis 

Notes

Funding information

This study was supported by the Natural Science Foundation of Hebei Province (grant Numbers: B2013202113, E2018202333).

Compliance with Ethical Standards

Conflict of Interest

The authors declare that they have no competing interest.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Tianjin Key Laboratory of Clean Energy and Pollution Control, School of Energy and Environmental EngineeringHebei University of TechnologyTianjinChina
  2. 2.Institute of Oceanology, Chinese Academy of SciencesQingdaoChina

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