13C NMR and XPS characterization of anion adsorbent with quaternary ammonium groups prepared from rice straw, corn stalk and sugarcane bagasse

被引:99
作者
Cao, Wei [1 ]
Wang, Zhenqian [1 ]
Zeng, Qingling [1 ]
Shen, Chunhua [1 ]
机构
[1] Huaqiao Univ, Coll Civil Engn, Xiamen 361021, Peoples R China
基金
中国国家自然科学基金;
关键词
Characterization; Crop straw; Modification; Anion adsorbent; Quaternary ammonium group; SOLID-STATE NMR; CELLULOSE FIBERS; WOOD; CHITOSAN; REMOVAL;
D O I
10.1016/j.apsusc.2016.07.095
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Despite amino groups modified crop straw has been intensively studied as new and low-cost adsorbent for removal of anionic species from water, there is still a lack of clear characterization for amino groups, especially quaternary ammonium groups in the surface of crop straw. In this study, we used C-13 NMR and XPS technologies to characterize adsorbents with quaternary ammonium groups prepared from rice straw, corn stalk and sugarcane bagasse. C-13 NMR spectra clearly showed the presence of quaternary ammonium groups in lignocelluloses structure of modified crop straw. The increase of nitrogen observed in XPS survey spectra also indicated the existence of quaternary ammonium group in the surface of the adsorbents. The curve fitting of high-resolution XPS N1s and C1s spectra were conducted to probe the composition of nitrogen and carbon contained groups, respectively. The results showed the proportion of quaternary ammonium group significantly increased in the prepared adsorbent's surface that was dominated by methyl/methylene, hydroxyl, quaternary ammonium, ether and carbonyl groups. This study proved that C-13 NMR and XPS could be successfully utilized for characterization of quaternary ammonium modified crop straw adsorbents. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码:404 / 410
页数:7
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