A green pretreatment approach of corn stalk wastes for obtaining micro/nano-cellulose fibers, monosaccharides and lignin fractions

Shibo Yang, Keli Chen, Zhengliang Zhu, Qingqing Guan, Huajing Zhou and Liang He

Renewable Energy, 2022, vol. 194, issue C, 746-759

Abstract: Efficient separation of carbohydrates and lignin from lignocellulosic biomass, and further high-value conversion are still the main challenge of biorefinery. Oxygen-enhanced alkali treatment as a green method for separating polysaccharides and lignin from gramineous materials with environmental, economic and low energy consumption. Herein, oxygen-enhanced alkali technology was used to pretreatment corn stalk pith, and then realize high-value transformation. The results showed that oxygen-enhanced alkali treatment combined with acid precipitation, ethanol precipitation, enzymatic hydrolysis or ultrasonic can achieve clean, efficient separation and subsequent high-value transformation of various components of corn pith. The enzymatic efficiencies of solid and liquid polysaccharides were 75.42% and 50.52% respectively, and the structure of micro/nano-cellulose fiber is mostly flaky and granular. In addition, the separated lignin contains many small molecular compounds, which has the potential value of further utilization. In this study, oxygen-enhanced alkali treatment can achieve clean, efficient separation and subsequent high-value transformation of various components in corn stalk or lignocellulosic biomass, which has important practical significance.

Keywords: Corn stalk pith; Oxygen-enhanced alkali treatment; Enzymatic hydrolysis; Polysaccharides; Lignin (search for similar items in EconPapers)
Date: 2022
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:194:y:2022:i:c:p:746-759

DOI: 10.1016/j.renene.2022.05.137

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