Amine-functionalized low-cost industrial grade multi-walled carbon nanotubes for the capture of carbon dioxide

• Published in: Journal of energy chemistry 2014, Vol.23 (1), p.111-118
• Main Authors: Liu, Qing, Shi, Yao, Zheng, Shudong, Ning, Liqi, Ye, Qing, Tao, Mengna, He, Yi
• Format: Article
• Language: English
• Subjects: Adsorbents; adsorption; Air pollution caused by fuel industries; amine; amine modification; Applied sciences; carbon; Chemistry; CO2; CO2 adsorption; Energy; Energy. Thermal use of fuels; Exact sciences and technology; General and physical chemistry; heat; heat of adsorption; modification; multi-walled; multi-walled carbon nanotubes (MWCNTs); nanotubes(MWCNTs); Pollution reduction; Stack gas and industrial effluent processing; Surface physical chemistry; tetraethylenepentamine(TEPA)
• ISSN: 2095-4956
• DOI: 10.1016/S2095-4956(14)60124-8

Industrial grade multi-walled carbon nanotubes(IG-MWCNTs) are a low-cost substitute for commercially purified multi-walled carbon nanotubes(P-MWCNTs). In this work, IG-MWCNTs were functionalized with tetraethylenepentamine(TEPA) for CO2capture. The TEPA impregnated IG-MWCNTs were characterized with various experimental methods including N2adsorption/desorption isotherms, elemental analysis, X-ray diffraction, Fourier transform infrared spectroscopy and thermogravimetric analysis. Both the adsorption isotherms of IGMWCNTs-n and the isosteric heats of different adsorption capacities were obtained from experiments. TEPA impregnated IG-MWCNTs were also shown to have high CO2adsorption capacity comparable to that of TEPA impregnated P-MWCNTs. The adsorption capacity of IG-MWCNTs based adsorbents was in the range of 2.145 to 3.088 mmol/g, depending on adsorption temperatures. Having the advantages of low-cost and high adsorption capacity, TEPA impregnated IG-MWCNTs seem to be a promising adsorbent for CO2capture from flue gas.