The Effect of Irradiation Combined with Sodium Hydroxide Pretreatment on Component, Structure, Utilization Efficiency of Phragmites Australis

文献类型： 外文期刊

第一作者： Qi, Hui

作者： Qi, Hui;Wu, Xiaofen;Chen, Liang;Liu, An;Deng, Ming;Wei, Dongning;Wang, Keqin;Wang, Danyang;Peng, Zhili

作者机构：

关键词： Phragmites australis; Irradiation combined with NaOH pretreatment; Component; Structure; Utilization efficiency

期刊名称：WASTE AND BIOMASS VALORIZATION （ 影响因子：2.6； 五年影响因子：3.1 ）

ISSN： 1877-2641

年卷期： 2024 年

页码：

收录情况： SCI

摘要： Phragmites australis (Reed) is an excellent lignocellulosic crop for bioethanol production, but its recalcitrant structure affects utilization efficiency. Therefore, the effective pretreated method to destroy the complex and tight structure was necessary. In this study, Irradiation (0,400,800 kGy) combined with sodium hydroxide (NaOH) (0,1%,2%,4%) pretreatment was used for the deconstruct lignocellulose structure of reed stalk, and the residue after pretreatment were subjected to enzymatic hydrolysis and synchronous saccharification and fermentation (SSF). Scanning electron microscope (SEM), Fourier transformed infrared spectroscopy (FTIR) and X-ray diffraction (XRD) were used to determine the structural changes of reed stalk after different pretreatment. Gas Chromatography and Mass Spectrometry (GC/MS) was used to analysis the main lignocellulose-derived inhibitor produced by pretreatment. The results demonstrated that irradiation combined with NaOH pretreatment could destroy the lignocellulose structure, remove the lignin and hemicellulose partially, increase the content of cellulose, and promote fermentable sugar content for ethanol fermentation. The maximum enzymatic hydrolysis conversion rate of cellulose was 85.02% when the reed stalk was treated by 800 kGy irradiation combined with 4% NaOH solution. The maximum ethanol conversion rate was 73.35% when the reed stalk was pretreated by 800 kGy irradiation combined with 2% NaOH solution. Irradiation pretreatment destroyed the tightly packed structure, induced the fracture of hydrogen bond or covalent bond of reed stalk lignocellulose, broken the crystal structure of cellulose. Irradiation combined with NaOH treatment, the characteristic peak intensity of hemicellulose and lignin decreased or even disappeared in FT-IR spectroscopy. Interestingly, the cellulose crystal form transformed from I to II, when the reed stalk was treated by 800 kGy irradiation combined with NaOH solution. Overall, irradiation combined with NaOH pretreatment was effective for improving the utilization efficiency of reed stalk. [GRAPHICS] .

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