期刊
JOURNAL OF MOLECULAR STRUCTURE
卷 1127, 期 -, 页码 575-582出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molstruc.2016.08.002
关键词
Rice straw; Biosilica; XRD; XPS; Structure
资金
- National Natural Science Foundation of China [31300476, 31400496]
- Science Fund for Distinguished Young Scholars of Nanjing Forestry University [NLJQ2015-02]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
This study focused on the interfacial combination of silica and lignin-polysaccharides during lignocellulose fractionation of rice straw using scanning electric microscopy (SEM), x-ray photoelectron spectroscopy (XPS), and x-ray diffraction (XRD) techniques. Silica was deposited on the exterior surface of rice straw in the form of Si(OR)x, Si-O-Si, SiOx, and Si-C respectively, while not in the form of elemental Si. After delignification and alkalization, silica was deposited on the surface of polysaccharide with a more regular pattern. It is due to that silica reacted with polysaccharide to form SiOx and Si(OR)x during the decomposition of lignin and hemicellulose, leading to the remained framework structure of crystalline cellulose. After the decomposition of polysaccharide, silica was embedded into lignin fragments, and shown as an amorphous opal. For silica-lignin, Si-O-Si was gradually transferred to Si(OR)x instead of Si-C. The capacities of the fractionated components to bind or store silica were in order of lignin > polysaccharides > lipids. Moreover, the fractionated components of rice straw were associated with the different ultrastructural forms of the silica. (C) 2016 Elsevier B.V. All rights reserved.
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