Hydrothermal treatment is a clean and effectual treatment method. This work utilized the addition of organic acids and bases to assist the hydrothermal treatment of rape straw (RS), which eliminated the majority of lignin from the biomass. This enhancement of cellulose saccharification favored the conversion of hemicellulose into furfural and xylo-oligosaccharides. Pretreatment with 0.5 g/L NaOH at 200 °C for 1 h achieved 53.8 % lignin elimination rate and 63.7 % xylan removal rate. Additionally, the pretreatment liquor contained 1.1 g/L of furfural and 2.0 g/L of xylo-oligosaccharides. Various characterizations (FTIR, SEM, and XRD) and adsorption abilities of dye (Methylene Blue, Congo red, and Rose Bengal) were used to characterize the raw and pretreated RS, and the structure properties, chemical components and enzymatic saccharification efficiencies confirmed that the enhanced cellulose accessibility (from 372.2 mg/g to 712.1 mg/g), reduced lignin hydrophobicity (from 7.8 L/g to 2.9 L/g), and decreased lignin surface area (from 568.7 m²/g to 218.1 m²/g) had substantially promoted the enzymatic saccharification ability of RS. Dilute alkaline-assisted hydrothermal treatment method built in this work effectually improved the reducing sugar yield of RS, while co-producing furfural, xylo-oligosaccharides, organic acids, and reducing sugars opens new avenues for value-added utilization of straw-based biomass.

中文翻译：

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油菜秸秆高效稀碱辅助水热处理联产低聚木糖、糠醛、有机酸和还原糖


水热处理是一种清洁有效的处理方法。这项工作利用添加有机酸和碱来辅助油菜秸秆（RS）的水热处理，从而消除了生物质中的大部分木质素。纤维素糖化的增强有利于半纤维素转化为糠醛和低聚木糖。用0.5 g/L NaOH在200℃预处理1 h，木质素去除率达到53.8%，木聚糖去除率达到63.7%。另外，预处理液含有1.1g/L的糠醛和2.0g/L的低聚木糖。使用各种表征（FTIR、SEM 和 XRD）和染料（亚甲蓝、刚果红和玫瑰红）的吸附能力来表征原始和预处理的 RS，并且结构特性、化学成分和酶糖化效率证实了纤维素可及性增强（从 372.2 mg/g 至 712.1 mg/g），木质素疏水性降低（从 7.8 L/g 至 2.9 L/g），木质素表面积降低（从 568.7 m²/g 至 218.1 m²/g）显着提高了RS的酶促糖化能力。本工作建立的稀碱辅助水热处理方法有效提高了RS的还原糖收率，同时联产糠醛、低聚木糖、有机酸和还原糖，为秸秆类生物质的增值利用开辟了新途径。