葛根渣中纤维素的分离研究

doi:10.3969/j.issn.0253-2417.2022.01.011

摘要/Abstract

摘要：

采用范氏法测定葛根渣中纤维素、半纤维素和木质素含量，以亚氯酸钠和氢氧化钠为处理试剂，依次对葛根渣进行处理制备葛根渣纤维素。通过考察处理试剂的质量分数、反应温度、反应时间等因素优化分离工艺条件，并用扫描电镜(SEM)、X射线粉末衍射(XRD)、傅里叶变换红外光谱(FT-IR)和热重(TG)分析了葛根渣、亚氯酸钠处理后的葛根渣和葛根渣纤维素的形貌、晶体结构、化学结构和热稳定性。分析结果表明：葛根渣中纤维素的质量分数为59%，经过4%的亚氯酸钠于100℃处理120 min后纤维素的质量分数提高到84%左右，进一步经15%的氢氧化钠于80℃下处理120 min后纤维素的质量分数可达到94%左右；获得的纤维素为Ⅰ型晶体结构，结晶度为71.5%，最大热解峰值温度为356℃，具有良好的热稳定性。

关键词: 葛根渣, 工艺优化, 纤维素

Abstract:

Cellulose, hemicellulose and lignin contents in P.eduli.residues were determined by van's method.Cellulose in Pueraria edulis Pampan.residue was sequentially treated with sodium chlorite and sodium hydroxide as treatment reagents.Various factors including mass fraction of sodium chlorite and sodium hydroxide, reaction temperature and reaction time were optimized.In addition, the morphology, crystal structure, chemical structure, and thermal stability of P.edulis residue, P.edulis residue after chlorite treatment, and P.edulis cellulose (P.edulis residue after further treatment with sodium hydroxide) were characterized by scanning electron microscopy (SEM), X-ray powder diffraction (XRD), Fourier transform infrared spectrum (FT-IR) and differential thermal gravimetric analysis, respectively.The results demonstrated that the content of cellulose in original P.edulis residue was 59%, which was increased to about 84% after treatment by 4% sodium chlorite at 100℃ for 120 min, and could further reach 94% after treated by 15% sodium hydroxide at 80℃ for 120 min.Ultimately, the crystal texture of P.edulis cellulose was ascribed to cellulose Ⅰ with the crystallinity of 71.5%.The maximum pyrolysis temperature of P.edulis cellulose was determined as 356℃, strongly demonstrating its good thermal stability.

Key words: Pueraria edulis Pampan. residue, process optimization, cellulose

中图分类号:

TQ35

彭大钊, 郭婕, 贺健, 周贤武, 宋科. 葛根渣中纤维素的分离研究[J]. 林产化学与工业, 2022, 42(1): 79-86.

Dazhao PENG, Jie GUO, Jian HE, Xianwu ZHOU, Ke SONG. Separation of Cellulose from Pueraria edulis Pampan. Residue[J]. Chemistry and Industry of Forest Products, 2022, 42(1): 79-86.

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