Fourier transform infrared spectroscopy analysis for hydrothermal transformation of microcrystalline cellulose on montmorillonite
Fourier transform infrared spectroscopy analysis for hydrothermal transformation of microcrystalline cellulose on montmorillonite
复制标题
蒙脱石上微晶纤维素水热转化的傅里叶变换红外光谱分析
DOI：
10.1016/j.clay.2014.03.014
复制
发表时间：
2014-06-01
影响因子：
5.6
通讯作者：
Wang, Hao
中科院分区：
文献类型：
--
作者：
Wu, Lin Mei;Tong, Dong Shen;Wang, Hao
阐明蒙脱石与纤维素之间的相互作用有助于理解土壤生物量的演化和自然界化石燃料的地质形成。采用傅里叶变换红外光谱法研究了微晶纤维素在蒙脱土上的水热转化过程。将微晶纤维素与蒙脱土以不同比例在200 ℃下水热处理16 h，得到一系列样品。通过使用傅里叶变换红外（FTIR）光谱分析所得固体样品。利用数学方法对吸收光谱进行二阶导数处理，研究了水热处理前后的细微变化。结果表明，蒙脱石与微晶纤维素在水热过程中存在相互作用。在蒙脱土的存在下，纤维素被转化为具有脂肪族CHx和芳香族基团的产物。这些通过样品的FTIR光谱进一步证实，所述样品通过使用HCl/HF酸溶液进一步处理以去除其中的蒙脱石（脱矿）。计算结构参数（“A因子”、“C因子”和CH 3/CH 2比）。所得固体样品的“A因子”和CH 3/CH 2比值随蒙脱土含量的增加而增加。蒙脱石矿物对“C因子”值的影响不大。结果表明，蒙脱石辅助纤维素的水热处理能够产生干酪根类似物。(C)© 2014 Elsevier B. V.保留所有权利。
Specifying the interactions between montmorillonite and cellulose is helpful for understanding the evolution of biomass in soil and the geological formation of fossil fuels in nature. In this work, Fourier transform infrared spectroscopy was used to investigate the hydrothermal transformation of microcrystalline cellulose on montmorillonite. A series of samples were obtained from hydrothermal treatments of microcrystalline cellulose with montmorillonite in various ratios at 200 degrees C for 16 h. The resulting solid samples were analyzed by using Fourier transform infrared (FTIR) spectroscopy. The subtle changes before and after hydrothermal treatments were particularly studied by using mathematical methods to generate second derivatives of absorbance spectra. It was found that there were interactions between montmorillonite and microcrystalline cellulose during the hydrothermal process. In the presence of montmorillonite, the cellulose was transformed to yield a product with aliphatic CHx and aromatic groups. These were further confirmed by the FTIR spectra of the samples which were further treated by using an HCl/HF acid solution to remove the montmorillonite in them (demineralization). The structural parameters ('A Factor', 'C Factor' and CH3/CH2 ratio) were calculated. The values of the 'A Factor' and CH3/CH2 ratio of the resulting solid samples increased with the increase of montmorillonite. The values of 'C Factor' were little affected by the montmorillonite minerals. The findings suggested that montmorillonite-assisted hydrothermal treatment of cellulose was able to produce kerogen analogs. (C) 2014 Elsevier B.V. All rights reserved.