摘要
对天然麦秸秆(NWS)、柠檬酸改性麦秸秆(CWS)、乙二胺改性麦秸秆(EWS)的红外光谱进行了比较分析。NWS的红外吸收光谱主要由碳水化合物如木质素、纤维素等吸收带组成。NWS表面的羟基吸收峰出现在3405.16cm-1、2916.81cm-1处的吸收峰来自亚甲基中C—H的伸缩振动。1736.02cm-1和1602.21cm-1处的吸收峰是由C O的伸缩振动引起的;苯环的骨架伸缩振动峰出现在1511.33cm-1;1425.47cm-1处的吸收峰是来自羧基的C—O伸缩振动,1376.19cm-1处为CH2的弯曲振动峰。与NWS的红外光谱图相比,CWS的主要变化为1738.13cm-1和1592.06cm-1处C O吸收峰强度显著增加;EWS的主要变化为3405.16cm-1处的吸收峰蓝移至3417.43cm-1,且强度增加,1736.02cm-1处的吸收峰消失,CH2的C—H伸缩振动峰(2903.49cm-1)和弯曲振动峰(1382.91cm-1)强度显著增加.结果说明改性后分别引入了羧基和胺基。
The infrared spectra of natural wheat straw （NWS） ,citric acid modified wheat straw （CWS） and ethylenediamine modified wheat straw （EWS） were compared and analyzed. The IR absorption spectroscopy of NWS was mainly composed by the adsorption bands of carbohydrates including lignin,cellulose etc. A broad band near 3405. 16cm-1 indicated the presence of hydroxyl （OH） groups in the surface of NWS, and C--O group stretching presented a signal peak at 2916.81cm-1. The peaks located at 1736.02cm-1 and 1602.21cm-1 were characteristics of carbonyl groups stretching. The peak near 1511.33cm-1 was assigned to the stretching in benzene rings. The peak near 1425.47cm-1 was attributed to the stretch vibration of C--O from carboxyl group. The peak at 1376.19cm-1 was from bending vibration of CH2. Compared to the IR spectra of NWS,citric acid modification brought increase of absorption peak intensity of carboxyl group （1738. 13cm-1 and 1592.06cm-1）. For EWS,the absorption peak at 3405.16cm-1 was shifted to 3417.43cm-1 and the relative strength became stronger,while the peak at 1736.02cm-1 was not observed,and peak strength at 2903. 43cm-1 and 1382. 91cm-1 from CH2 also became stronger. The results showed that the modified can respectively introduce carboxyl group and amido group.
出处
《光谱实验室》
CAS
CSCD
2012年第6期3553-3556,共4页
Chinese Journal of Spectroscopy Laboratory
基金
河南省基础与前沿研究项目(No.92300410030)
关键词
麦秸秆
红外光谱
柠檬酸
乙二胺
Wheat Straw
Infrared Spectroscopy
Citrate Acid
Ethylenediamine
