期刊
CARBOHYDRATE POLYMERS
卷 117, 期 -, 页码 917-922出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2014.10.028
关键词
Ultrasonic treatment; Metal ion; Selective acid hydrolysis; Microcrystalline cellulose; Amorphous regions
资金
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20126125130001]
- State Key Lab of Pulp and Paper Engineering Open Fund [201215]
- Shaanxi Province Natural Science Fund Project [2013JM2007]
- Shaanxi University of Science Technology [BJ13-02]
The effect of ultrasonic pretreatment coupled with HCl-FeCl3 catalyst was evaluated to hydrolyze cellulose amorphous regions. The ultrasonic pretreatment leads to cavitation that affects the morphology and microstructure of fibers, enhancing the accessibility of chemical reagent to the loosened amorphous regions of cellulose. In this work, Fourier transform infrared spectroscopy (FTIR) was used to identify characteristic absorption bands of the constituents and the crystallinity was evaluated by the X-ray diffraction (XRD) technique. The results indicated that appropriate ultrasonic pretreatment assisted with FeCl3 can enhance the acid hydrolysis of amorphous regions of cellulose, thus improving the crystallinity of the remaining hydrocellulose. It was observed that sonication samples that were pretreated for 300W and 20 min followed by acid hydrolysis had maximum of 78.9% crystallinity. The crystallinity was 9.2% higher than samples that were not subjected to ultrasound. In addition, the average fines length decreased from 49 mu m to 37 mu m. (C) 2014 Elsevier Ltd. All rights reserved.
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