Citation: YE Qing, ZHANG Yu, LI Ming, SHI Yao. Adsorption of Low Concentration CO₂ by Modified Carbon Nanotubes under Ambient Temperature[J]. Acta Physico-Chimica Sinica, ;2012, 28(05): 1223-1229. doi: 10.3866/PKU.WHXB201202234 shu

Adsorption of Low Concentration CO₂ by Modified Carbon Nanotubes under Ambient Temperature

YE Qing ¹ ,
ZHANG Yu ¹ ,
LI Ming ² ,
SHI Yao ^1,

1.
1. Institute of Industrial Ecology and Environment, Department of Chemical and Biological Engineering, Faculty of Engineering, Zhejiang University, Hangzhou 310028, P. R. China;
2. Zhejiang Shuren University, Hangzhou 310015, P. R. China

Received Date: 18 October 2011
Available Online: 23 February 2012
Fund Project: 国家自然科学基金(20976159)资助项目 (20976159)

Solid amine adsorbents for low concentration CO₂ removal were developed using carbon nanotubes (CNTs) impregnated with tetraethylenepentamine (TEPA) and triethylenetetramine (TETA). The adsorbents were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy (FITR), N₂ adsorption/desorption, elemental analysis and thermogravimetric analysis (TGA). After impregnation, the shapes, fundamental channels and pore structures of the adsorbents were unchanged. However, the surface area and pore volume decreased. The adsorption behavior toward low concentration CO₂ was investigated in a fixed-bed column. The results indicated that the adsorption capacity was enhanced substantially by modification. The CO₂ adsorption capacity of CNTs-TEPA was higher than that of CNTs-TETA with the same amount of amine loading. The adsorption capacity increased steadily from 126.7 to 139.3 mg·g^-1 for CNTs-TEPA and from 101.2 to 110.4 mg·g^-1 for CNTs-TETA as the temperature increased from 20 to 30 ℃. The adsorption capacity of the raw CNTs experienced a modest increase, but began to decrease gradually with further temperature increases. Suyadal and Yasyerli deactivation models were applied to investigate the experimental breakthrough curves of raw and modified CNTs. It was concluded that the Yasyerli deactivation model is more appropriate to analyze the breakthrough curves of CO₂ adsorption on solid amine adsorbents.
- Carbon nanotube,
- CO₂ adsorption,
- Triethylenetetramine,
- Tetraethylenepentamine,
- Deactivation model
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Adsorption of Low Concentration CO2 by Modified Carbon Nanotubes under Ambient Temperature

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Adsorption of Low Concentration CO₂ by Modified Carbon Nanotubes under Ambient Temperature