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

WANG Mei; JIA Xian-feng; MA Cheng; WANG Ji-tong; SONG Zhen-chao; LONG Dong-hui; QIAO Wen-ming; LING Li-cheng

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Article Navigation > New Carbon Mater. > 2017 > 32(4): 358-364

WANG Mei, JIA Xian-feng, MA Cheng, WANG Ji-tong, SONG Zhen-chao, LONG Dong-hui, QIAO Wen-ming, LING Li-cheng. Adsorption and desorption behavior of benzene and toluene on porous carbon monoliths. New Carbon Mater., 2017, 32(4): 358-364.

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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).

Received Date: 2017-05-28
Accepted Date: 2017-08-31
Rev Recd Date: 2017-08-05
Publish Date: 2017-08-28

Abstract

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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References(25)

References

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