整体型多孔炭的制备及其对苯和甲苯吸/脱附行为研究

王梅; 贾献峰; 马成; 王际童; 宋振超; 龙东辉; 乔文明; 凌立成

整体型多孔炭的制备及其对苯和甲苯吸/脱附行为研究

1.
华东理工大学, 化学工程联合国家重点实验室, 上海 200237;
2.
中国人民解放军防化学院, 北京 102205;
3.
山西新华化工有限责任公司, 山西太原 030008

基金项目: 国家自然科学基金（21576090，51302083，51172071）.

详细信息

作者简介:
王梅,博士研究生,E-mail:wmecust@126.com

通讯作者:
凌立成,教授,E-mail:lchling@ecust.edu.cn

中图分类号: TQ127.1⁺1
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- 文章访问数: 409
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- 被引次数: 0
出版历程
- 收稿日期: 2017-05-28
- 录用日期: 2017-08-31
- 修回日期: 2017-08-05
- 刊出日期: 2017-08-28

Adsorption and desorption behavior of benzene and toluene on porous carbon monoliths

1.
State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China;
2.
Institute of NBC Defense of the PLA, Beijing 102205, China;
3.
Shanxi Xinhua Chemical Co., Ltd, Taiyuan 030008, China

Funds: National Natural Science Foundation of China (21576090,51302083,51172071).

摘要

摘要: 以酚醛树脂溶液为前驱体，预氧化聚丙烯腈纤维毡为增强体，通过溶胶-凝胶反应、常压干燥、炭化、CO₂活化等工艺制备出高强度、高比表面积的整体型多孔炭。通过SEM、TEM和N₂吸/脱附表征该材料的微观结构及孔结构参数，并采用重量法测得材料对两种典型VOCs（苯和甲苯）的吸/脱附性能。结果表明，所制整体型多孔炭具有典型的纤维增强气凝胶的结构，活化后样品（ACM-3）比表面积可高达1 872 m²/g，孔容为0.97 cm³/g，该样品对50 ppm苯的吸附量为117 mg/g，对甲苯的吸附量可高达287 mg/g，且对苯和甲苯都具有最快的吸/脱附动力学。采用三种方程对吸附等温线进行拟合，基于微孔填充机理的DR方程对实验结果的关联度最好。此外，整体型多孔炭还具有长期循环使用的稳定性，是一种具有潜在应用价值的室内空气净化材料。
- 整体型多孔炭 /
- 苯 /
- 甲苯 /
- 吸附 /
- 脱附
Abstract: Highly porous carbon monoliths with good mechanical strength were prepared by the sol-gel polymerization of phenolic resin in oxidized polyacrylonitrile fiber felts, ambient drying, carbonization at 800℃ for 2 h and CO₂ activation at 950℃ for 1 to 3 h. Their microstructure and pore structure were investigated by SEM, TEM and N₂ adsorption. Their adsorption/desorption performance for benzene and toluene was measured by the gravimetric method. It is found that the carbon monoliths have a typical fiber-reinforced aerogel structure and the sample activated for 3 h (ACM-3) has a well-developed microporous structure with a BET surface area of 1 872 m²/g and pore volume of 0.97 cm³/g. ACM-3 shows high adsorption capacities of 117 and 287 mg/g for 50 ppm benzene and toluene, respectively, and the fastest adsorption/desorption kinetics. The Langmuir, Freundlich and DR isotherm models are used to fit the experimental adsorption data and the DR model shows the highest correlation coefficient. Moreover, ACM-3 has an excellent cyclic stability. The as-prepared carbon monoliths are promising adsorbents for the adsorption of volatile organic compounds in indoor air purification.
- Porous carbon monoliths /
- Benzene /
- Toluene /
- Adsorption /
- Desorption

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