Effects of D-hot pretreatment on micro-distribution of residual lignin in sugarcane bagasse pulp and fiber properties
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Pretreatment of sugarcane bagasse pulp by hot chlorine dioxide has been performed to study delignification and structural changes in lignocelluloses. The compositions of the products were measured by gas chromatography mass spectrometry. The structure and morphology of the D-hot pretreated sugarcane bagasse pulps were characterized by FTIR, scanning electron microscope, X-ray diffraction, Metso Kajaani FS300 fiber analyzer and optical analyzer. Temperature played a crucial role in the lignin depolymerization and hemicellulose hydrolysis. The results show that the lignin content was reduced by 28.39% in the P layer and 20.93% in the S layer with increasing temperature from 60 to 95 °C. The resulting compositions of D-hot stage effluent were mainly including oxidized lignin and derivatives of furfural. Compared with the control, the category of oxidized lignin can be increased with D-hot pretreatment. Also, pretreated bagasse pulp has high brightness of 59.71% ISO, crystallinity index of 70.84%, L/W of 50.84 and outstanding optical properties. Therefore, bleached bagasse pulps might have the opportunities for further application in paper and paper-based materials.
KeywordsSugarcane bagasse pulp Hot chlorine dioxide pretreatment Oxidized lignin SEM–EDS GC–MS XRD
This project was supported by the National Natural Science Foundation of China (31760192), the Scientific Research Foundation of Guangxi University (XGZ160166).
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