Hierarchical pore structure of activated carbon fabricated by CO2/microwave for volatile organic compounds adsorption

doi:10.1016/j.cjche.2017.04.006

Chinese Journal of Chemical Engineering ›› 2018, Vol. 26 ›› Issue (1): 81-88.DOI: 10.1016/j.cjche.2017.04.006

• Separation Science and Engineering • 上一篇下一篇

Hierarchical pore structure of activated carbon fabricated by CO₂/microwave for volatile organic compounds adsorption

Wenjuan Qiu¹, Kang Dou¹, Ying Zhou², Haifeng Huang¹, Yinfei Chen², Hanfeng Lu²

1 College of Environment, Zhejiang University of Technology, Hangzhou 310014, China;
2 College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China

收稿日期:2017-01-05 修回日期:2017-04-08 出版日期:2018-01-28 发布日期:2018-03-01
通讯作者: Hanfeng Lu,E-mail address:luhf@zjut.edu.cn
基金资助:
Supported by the National Natural Science Foundation of China (21506194, 21676255), the Natural Science Foundation of Zhejiang Province (Y16B070025), the Commission of Science and Technology of Zhejiang Province (2013C03021, 2017C33106).

Hierarchical pore structure of activated carbon fabricated by CO₂/microwave for volatile organic compounds adsorption

Wenjuan Qiu¹, Kang Dou¹, Ying Zhou², Haifeng Huang¹, Yinfei Chen², Hanfeng Lu²

1 College of Environment, Zhejiang University of Technology, Hangzhou 310014, China;
2 College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China

Received:2017-01-05 Revised:2017-04-08 Online:2018-01-28 Published:2018-03-01
Contact: Hanfeng Lu,E-mail address:luhf@zjut.edu.cn
Supported by:
Supported by the National Natural Science Foundation of China (21506194, 21676255), the Natural Science Foundation of Zhejiang Province (Y16B070025), the Commission of Science and Technology of Zhejiang Province (2013C03021, 2017C33106).

摘要/Abstract

摘要： An activated carbon pore-expanding technique was achieved through innovative reactivation by CO₂/microwave. The original and modified activated carbons were characterized by nitrogen adsorption-desorption, scanning electron microscopy, transmission electron microcopy, and Fourier transform infrared spectroscopy. The mesopore volume increased from 0.122 cm³·g^-1 to 0.270 cm³·g^-1, and a hierarchical pore structure was formed. A gradual decrease in the phenolic hydroxyl and carboxyl groups on the surface of activated carbon enhanced the surface inertia of granular activated carbon (GAC). The toluene desorption rate of the modified sample increased by 8.81% compared with that of the original GAC. Adsorption isotherm fittings revealed that the Langmuir model was applicable for the original and modified activated carbons. The isosteric adsorption heat of toluene on the activated carbon decreased by approximately 50%, which endowed the modified sample with excellent stability in application. The modified samples showed an enhanced desorption performance of toluene, thereby opening a way to extend the cycle life and improve the economic performance of carbon adsorbent in practical engineering applications.

关键词: Activated carbon, CO₂/microwave, Pore regulation, volatile organic compounds, Desorption

Abstract: An activated carbon pore-expanding technique was achieved through innovative reactivation by CO₂/microwave. The original and modified activated carbons were characterized by nitrogen adsorption-desorption, scanning electron microscopy, transmission electron microcopy, and Fourier transform infrared spectroscopy. The mesopore volume increased from 0.122 cm³·g^-1 to 0.270 cm³·g^-1, and a hierarchical pore structure was formed. A gradual decrease in the phenolic hydroxyl and carboxyl groups on the surface of activated carbon enhanced the surface inertia of granular activated carbon (GAC). The toluene desorption rate of the modified sample increased by 8.81% compared with that of the original GAC. Adsorption isotherm fittings revealed that the Langmuir model was applicable for the original and modified activated carbons. The isosteric adsorption heat of toluene on the activated carbon decreased by approximately 50%, which endowed the modified sample with excellent stability in application. The modified samples showed an enhanced desorption performance of toluene, thereby opening a way to extend the cycle life and improve the economic performance of carbon adsorbent in practical engineering applications.

Key words: Activated carbon, CO₂/microwave, Pore regulation, volatile organic compounds, Desorption

Wenjuan Qiu, Kang Dou, Ying Zhou, Haifeng Huang, Yinfei Chen, Hanfeng Lu. Hierarchical pore structure of activated carbon fabricated by CO₂/microwave for volatile organic compounds adsorption[J]. Chinese Journal of Chemical Engineering, 2018, 26(1): 81-88.

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Hierarchical pore structure of activated carbon fabricated by CO₂/microwave for volatile organic compounds adsorption

Hierarchical pore structure of activated carbon fabricated by CO₂/microwave for volatile organic compounds adsorption

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