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

doi:10.11896/cldb.21030276

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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.

Key words： cellulose ionic liquid Congo red Schiff base reaction adsorbents

Published: 25 June 2022 Online: 2022-06-24

CLC number:	TQ352
	O647.33

Fund:National Natural Science Foundation of China (21805177), the Open Project of Shaanxi Collaborative Innovation Center of Industrial Auxiliary Chemistry and Technology (XTKF-2019-06) and the Special Fund for High-level Talents of Xijing University (XJ18T03).

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	Articles by authors
	SONG Wenqi
	HUO Wenjuan
	YANG Jinteng
	LUO Chen
	ZI Shuai
	LIU Yukun
	LI Yaxing
	QIAN Liwei

Cite this article:

SONG Wenqi,HUO Wenjuan,YANG Jinteng, et al. Aminopropyl Imidazolium Ionic Liquid Modified Cellulosic Aerogel Adsorbent for Congo Red Removal:High-performance and Adsorption Mechanism[J]. Materials Reports, 2022, 36(12): 21030276-7.

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http://www.mater-rep.com/EN/10.11896/cldb.21030276 OR http://www.mater-rep.com/EN/Y2022/V36/I12/21030276

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