Acta Phys. -Chim. Sin. ›› 2014, Vol. 30 ›› Issue (4): 789-796.doi: 10.3866/PKU.WHXB201402123


Preparation of Polyethylenimine-Functionalized Silica Nanotubes and Their Application for CO2 Adsorption

YAO Man-Li, DONG Yan-Yan, XIE Jing, JIA Ai-Ping, XIE Guan-Qun, HU Geng-Shen, LUO Meng-Fei   

  1. Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, Zhejiang Province, P. R. China
  • Received:2013-12-30 Revised:2014-02-01 Published:2014-03-31
  • Contact: HU Geng-Shen
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (21203167).


Mesoporous ethane-silica nanotubes (E-SNTs) were synthesized using P123 as a template and 1,2-bis(trimethoxysilyl)ethane (BTME) as a silica source. E-SNTs were modified with polyethylenimine (PEI) as sorbents for CO2 adsorption. These new composite sorbents were characterized by transmission electron microscopy (TEM), nitrogen adsorption/desorption, Fourier transform infrared (FTIR) spectroscopy, and thermal gravimetric analysis (TGA). We found that 75 ℃ is the optimal temperature for CO2 adsorption. E-SNTs with a 50% (w) PEI loading (E-SNTs-50) exhibited a higher CO2 adsorption capacity (3.32 mmol·g-1) than the other materials. The E-SNTs-based sorbents show better CO2 capture performance than the SBA-15-based sorbents. Additionally, CO2 uptake was further enhanced to 3.75 mmol·g-1 in the presence of moisture. Cyclic CO2 adsorption-desorption test results indicated that the composite sorbents are stable and can be regenerated.

Key words: Mesoporoussilica nanotube, Polyethylenimine, Adsorption, CO2 capture