烟梗表面基团分析
Analysis of surface functional groups on tobacco stem
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摘要: 采用常规方法切丝考察微波膨胀处理对烟梗表面基团的影响.采用傅里叶变换红外光谱(FT-IR)和X-射线光电子能谱(XPS)对样品进行了表征.FT-IR实验结果表明,微波处理后的烟梗表面羟基、羧基和-CN键的含量均显著增加,传统梗丝与新型梗丝并无明显不同;XPS实验表明,微波膨胀后碳元素更多以酚羟基、醚键和羧基的形式存在,4个样品中氧元素的存在形式没有变化,但是膨胀梗中羟基含量比原梗明显增加,此外,膨胀烟梗表面还发现了含氮基团.Abstract: The effect of microwave expansion on the surface functional groups of tobacco stem by conventional stem cutting method was studied.The stem was characterized by X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FT-IR).The FT-IR result showed that:after microwave treatment,the percentage of surface hydroxyl,carboxyl and -CN increased significantly.There was no significantly different between traditional cut stem and novel cut stem during FT-IR tests.The XPS result showed that phenolic hydroxyl,ether,carboxy were three forms of carbon in microwave expansion stem.The forms of oxygen in all samples were similar,and expanded stem had higher content of hydroxyl than original stem.In addition,there were many nitrogen groups in the surface of the expanded stem molecule.
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Key words:
- tobacco stem /
- microwave expansion /
- characteristics /
- surface functional group
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