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Combination of ultrasonication/mechanical refining with alkali treatment to improve the accessibility and porosity of bamboo cellulose fibers for the preparation of magnetic bionanocomposite cellulose beads

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Journal of Bioresources and Bioproducts 2018年第2期3卷 40-48页

作者： Man Li Guigan Fang Zhaosheng Cai Long Liang Jing Zhou Lulu Wei Institute of Chemical Industry of Forestry Products CAFKey Lab.of Biomass Energy and MaterialJiangsu ProvinceNational Engineering Lab for Biomass Chemical UtilizationKey and Lab.on Forest Chemical EngineeringSFANanjing 210042China Collaborative Innovation Center for High Efficient Processing and Utilization of Forestry Resources Nanjing Forestry UniversityNanjing 210037China Yancheng Institute of Technology Yancheng 224051China

ultrasonication and mechanical refining pretreatments were carried out to enhance alkali swelling of bamboo fibers to improve accessibility and ***-based magnetic beads were synthesized with the alkali swollen bamboo fibers and Fe3O4 *** to the fibers treated with alkali alone,the water retention value(WRV)increased by 33.87%for the fibers treated by sonication and alkali,and by 94.58%for those treated by mechanical refining and *** increased WRV was attributed to disruption of the crystalline region of fibers in the combined treatments which resulted in decreased crystallinity and degree of polymerization of ***,compared with the control sample which was treated by alkali alone,the specific surface area and pore volume of the samples treated by the combined processes increased markedly,which favored the adsorption of Fe3O4 nanoparticles in the synthesis of functional magnetic cellulose beads for the applications of protein immobilization,drug carrier and wastewater treatment.

关键词： Pretreatment alkaline,ultrasonic Mechanical refining(PFI) Magnetic nanocomposite

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