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Enhancement of Enzymatic Hydrolysis and Klason Lignin Removal of Corn Stover Using Photocatalyst-Assisted Ammonia Pretreatment

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Abstract

Photocatalyst-assisted ammonia pretreatment was explored to improve lignin removal of the lignocellulosic biomass for effective sugar conversion. Corn stover was treated with 5.0–12.5 wt.% ammonium hydroxide, two different photocatalysts (TiO2 and ZnO) in the presence of molecular oxygen in a batch reactor at 60 °C. Various solid-to-liquid ratios (1:20–1:50) were also tested. Ammonia pretreatment assisted by TiO2-catalyzed photo-degradation removed 70 % of Klason lignin under the optimum condition (12.5 % ammonium hydroxide, 60 °C, 24 h, solid/liquid = 1:20, photocatalyst/biomass = 1:10 with oxygen atmosphere). The enzymatic digestibilities of pretreated corn stover were 85 % for glucan and 75 % for xylan with NH3-TiO2-treated solid and 82 % for glucan and 77 % for xylan with NH3-ZnO-treated solid with 15 filter paper units/g-glucan of cellulase and 30 cellobiase units/g-glucan of β-glucosidase, a 2–13 % improvement over ammonia pretreatment alone.

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Acknowledgments

DuPontTM Genencor® Biosciences Inc. is acknowledged for providing cellulase and xylanase for this study.

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Correspondence to Chenxu Yu or Tae Hyun Kim.

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Yoo, C.G., Wang, C., Yu, C. et al. Enhancement of Enzymatic Hydrolysis and Klason Lignin Removal of Corn Stover Using Photocatalyst-Assisted Ammonia Pretreatment. Appl Biochem Biotechnol 169, 1648–1658 (2013). https://doi.org/10.1007/s12010-012-0002-4

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  • DOI: https://doi.org/10.1007/s12010-012-0002-4

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