Promising seawater hydrothermal combining electro-assisted pretreatment for corn stover valorization within a biorefinery concept. (May 2022)

• Record Type: Journal Article
• Authors: Wu, Yue; Li, Xinting; Li, Fucheng; Ling, Zhe; Meng, Yao; Chen, Fushan; Ji, Zhe
• Is Part Of: Bioresource technology. Volume 351(2022)
• Publication Date: 2022-05
• Subjects: Corn stover -- Two-stage pretreatment -- Seawater hydrothermal pretreatment -- Electrogenerated alkaline hydrogen peroxide pretreatment -- Biorefinery; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2022.127066
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: A novel seawater hydrothermal combining electro-assisted pretreatment was developed. SHE pretreatment selectively removed xylan and lignin but well retained cellulose. The pretreatment process was cost-effective and eco-friendly. 49.37% XOS, 91.16% glucose and uniform lignin were produced from corn stover. Abstract: In this study, for the first time, seawater hydrothermal (SH) pretreatment combining subsequent electrogenerated alkaline hydrogen peroxide (EAHP) pretreatment was proposed to achieve an effective fractionation of corn stover into high value-added products. During SH pretreatment, complex ions in natural seawater (Mg 2+, Ca 2+ and Cl - ) were used to promote depolymerization of xylan into xylo -oligosaccharides with 49.37% yield (190 °C, 40 min), 18.52% higher than that of deionized water. Subsequent EAHP treatment not only provided a green and economical way to produce hydrogen peroxide but also synchronously realized satisfied delignification (94.91%). The integrated pretreatment resulted in 91.16% of glucose yield, which was about 5.6 times more than that of unpretreated corn stover. In addition, the recovered lignin fraction which has a potential application in functional materials were investigated by FTIR, 2D-HSQC NMR and GPC. In short, this work provided a novel and environmentally-friendly strategy for biorefinery-based fractionation of corn stover.