Aminopropyl Imidazolium Ionic Liquid Modified Cellulosic Aerogel Adsorbent for Congo Red Removal:High-performance and Adsorption Mechanism
SONG Wenqi1,2, HUO Wenjuan1, YANG Jinteng1, LUO Chen1, ZI Shuai1, LIU Yukun1, LI Yaxing1, QIAN Liwei2
1 School of Science, Xijing University, Xi'an 710123, China 2 Shaanxi Collaborative Innovation Center of Industrial Auxiliary Chemistry & Technology, Shaanxi University of Science & Technology, Xi'an 710021, China
Abstract: In this work, an aminopropyl imidazolium ionic liquid (AMIBr) modified cellulosic aerogel (CA) adsorbent (CA-g-AMIBr) was synthesized, and utilized to the removal of the azo dye Congo red from water. The preparation procedure was as follows. First, the cotton pulp was used as a raw material to obtain CA through the process of dissolution and regeneration in an alkali solvent system. After modification of CA with aldehyde group, the CA-g-AMIBr was prepared by Schiff base reaction with AMIBr as a modifier. In addition, the surface morphology, chemical structure and degree of substitution of as-prepared CA-g-AMIBr was systematically characterized and analyzed. The results show that CA-g-AMIBr not only shows a well-defined three-dimensional network interweaving structure, but also exhibites abundant imidazolium salt functional groups on its surface. Consequently, the adsorption experiments reveal that the saturated adsorption capacity of CA-g-AMIBr can reach 478 mg·g-1, which is much higher than that of CA (32 mg·g-1). Besides, the adsorption model fitting results demonstrates that the adsorption process of CA-g-AMIBr towards CR conforms to the pseudo-second order adsorption kinetic model and Langmuir adsorption isotherm model, indicating that the adsorption mechanism is dominated by the chemical adsorption between the AMIBr cationic group and CR anions. Furthermore, CA-g-AMIBr can show good adsorption performance after five adsorption-desorption cycles and display excellent selective adsorption property. Therefore, this work provides experimental basis and research ideas for the development of new biomass adsorbents, which is conducive to the trends and requirements of sustainable development and environmental protection.
作者简介: 宋文琦,西京学院副教授,本硕博均就读于西北工业大学,2017年获得材料学博士学位,同年入职西京学院工作至今,主要从事环境友好型高分子材料的制备与应用研究。以第一作者在国内外重要学术期刊Chemical Engineering Journal、Separation and Purification Technology等发表论文10余篇,申请国家发明专利10项,授权3项。
宋文琦, 霍文娟, 杨金腾, 罗晨, 訾帅, 刘玉坤, 历亚星, 钱立伟. 氨丙基咪唑离子液体修饰纤维素气凝胶吸附剂对刚果红的清除研究:高性能与吸附机理[J]. 材料导报, 2022, 36(12): 21030276-7.
SONG Wenqi, HUO Wenjuan, YANG Jinteng, LUO Chen, ZI Shuai, LIU Yukun, LI Yaxing, QIAN Liwei. Aminopropyl Imidazolium Ionic Liquid Modified Cellulosic Aerogel Adsorbent for Congo Red Removal:High-performance and Adsorption Mechanism. Materials Reports, 2022, 36(12): 21030276-7.
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