Abstract
The adsorption performance of multi-walled carbon nanotubes (MWCNTs) towards CO2 gas was enhanced by covalently grafting of phenylenediamine (PDA) via an activation-grafting process. Different loading amounts were achieved by changing the activation time and the dosage of activating agent. The so-synthesized adsorbents were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, Thermogravimetry analysis, Transmission electron microscope, Raman spectroscopy and Nitrogen adsorption–desorption analysis. The CO2 adsorption properties were studied via static volumetric method. The results indicated that the modification process did not alter the crystal structure, whilst the quantity of defect sites and amorphous structures increased greatly. Moreover, the average pore size after functionalization increased from 9.68 to 23.80 nm. 0.59 mmol·g−1 of CO2 were captured by aminated MWCNTs at 303.15 K and 200 kPa, while the adsorption capacity of the raw materials was only 0.17 mmol·g−1 under the same conditions. Adsorption–regeneration cycles exhibited the stability of the PDA modified MWCNTs during the prolonged cyclic operations. We found that the adsorption of CO2 on MWCNTs belonged to physical adsorption and the adsorption behavior of CO2 on PDA modified MWCNTs was a chemical adsorption. The effective enhancement of the CO2 capture ability was attributed to the increased number of active sites, which offered stronger interactions with CO2 after PDA grafting.
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Alesi Jr., W.R., Kitchin, J.R.: Evaluation of a primary amine-functionalized ion-exchange resin for CO2 capture. Ind. Eng. Chem. Res. 51, 6907–6915 (2012)
Alhwaige, A.A., Agag, T., Ishida, H., et al.: Biobased chitosan hybrid aerogels with superior adsorption: role of graphene oxide in CO2 capture. RSC Adv. 3, 16011–16020 (2013)
Armarego, W.L.F., Chai, C.L.L.: Purification of Laboratory Chemicals. Elsevier Science, Amsterdam (2003)
Feng, Y.Y., Chu, W., Sun, W.J.: Adsorption characteristics of methane on coal under reservoir temperatures. J. China Coal Soc. 37, 1488–1492 (2012)
Ferrari, A.C., Meyer, J.C., Scardaci, V., et al.: Raman spectrum of graphene and graphene layers. Phys. Rev. Lett. 97, 187401 (2006)
Gao, C., Vo, C.D., Jin, Y.Z., et al.: Multihydroxy polymer-functionalized carbon nanotubes: synthesis, derivatization, and metal loading. Macromolecules 38, 8634–8648 (2005)
Gui, M.M., Yap, Y.X., Chai, S.P., et al.: Multi-walled carbon nanotubes modified with (3-aminopropyl) triethoxysilane for effective carbon dioxide adsorption. Int. J. Greenh. Gas Control 14, 65–73 (2013)
Hoeven, M.: CO2 Emissions from Fuel Combustion Highlights. International Energy Agency, Paris (2013)
Houghton, J.T., Ding, Y., Griggs D.J., et al.: Climate change 2001: the Scientific Basis, Contribution of Working Group 1 to the Third Assessment Report of the Intergovernmental Panel on Climate Change (2001)
Hu, H.R.: Surface Modification of Carbon Nanotubes for Adsorption of Low-Concentration CO2 from Confined Space. Zhejiang University, Hangzhou (2013)
Kalijadis, A.M., Vukčević, M.M., Jovanović, Z.M., et al.: Characterization of surface oxygen groups on different carbon materials by the Boehm method and temperature programmed desorption. J. Serb. Chem. Soc. 76, 757–768 (2011)
Khatri, R.A., Chuang, S.S.C., Soong, Y., et al.: Thermal and chemical stability of regenerable solid amine sorbent for CO2 capture. Energy Fuels 20, 1514–1520 (2006)
Kong, H., Gao, C., Yan, D.: Functionalization of multiwalled carbon nanotubes by atom transfer radical polymerization and defunctionalization of the products. Macromolecules 37, 4022–4030 (2004)
Lee, S.Y., Park, S.J.: A review on solid adsorbents for carbon dioxide capture. J. Ind. Eng. Chem. 23, 1–11 (2015)
Lee, J.S., Kim, J.H., Kim, J.T., et al.: Adsorption equilibria of CO2 on zeolite 13X and zeolite X/activated carbon composite. J. Chem. Eng. Data 47, 1237–1242 (2002)
Liu, Y., Ye, Q., Shen, M., et al.: Carbon dioxide capture by functionalized solid amine sorbents with simulated flue gas conditions. Environ. Sci. Technol. 45, 5710–5716 (2011)
Lu, X., Xiao, H.: A review on CO2 sorbents. Rev. Adv. Mater. Sci. 42, 50–57 (2015)
Lu, X., Jin, D., Wei, S., et al.: Strategies to enhance CO2 capture and separation based on engineering absorbent materials. J. Mater. Chem. A 23, 12118–12132 (2015)
Millward, A.R., Yaghi, O.M.: Metal-organic frameworks with exceptionally high capacity for storage of carbon dioxide at room temperature. J. Am. Chem. Soc. 127, 17998–17999 (2005)
Na, B.K., Koo, K.K., Eum, H.M., et al.: CO2 recovery from flue gas by PSA process using activated carbon. Korean J. Chem. Eng. 18, 220–227 (2001)
Rochelle, G.T.: Amine scrubbing for CO2 capture. Science 325, 1652–1654 (2009)
Siriwardane, R.V., Shen, M.S., Fisher, E.P., et al.: Adsorption of CO2 on molecular sieves and activated carbon. Energy Fuels 15, 279–284 (2001)
Stangeland, A.: A model for the CO2 capture potential. Int. J. Greenh. Gas Control 1, 418–429 (2007)
Tachikawa, H., Kawabata, H.: Electronic states of defect sites of graphene model compounds: A DFT and direct molecular orbital-molecular dynamics study. J. Phys. Chem. C 113, 7603–7609 (2009)
Tamilarasan, P., Ramaprabhu, S.: Integration of polymerized ionic liquid with graphene for enhanced CO2 adsorption. J. Mater. Chem. A 3, 101–108 (2015)
Thommes, M., Kaneko, K., Neimark, A.V., et al.: Physisorption of gases, with special reference to the evaluation of surface area and pore size distribution (IUPAC Technical Report). Pure Appl. Chem. 87, 1051–1069 (2015)
Tsai, C.L., Chen, C.F.: Characterization of bias-controlled carbon nanotubes. Diam. Relat. Mater. 12, 1615–1620 (2003)
Vuković, G., Marinković, A., Obradović, M., et al.: Synthesis, characterization and cytotoxicity of surface amino-functionalized water-dispersible multi-walled carbon nanotubes. Appl. Surf. Sci. 255, 8067–8075 (2009)
Wang, Q., Luo, J., Zhong, Z., et al.: CO2 capture by solid adsorbents and their applications: current status and new trends. Energy Environ. Sci. 4, 42–55 (2011)
Ye, Q., Jiang, J., Wang, C., et al.: Adsorption of low-concentration carbon dioxide on amine-modified carbon nanotubes at ambient temperature. Energy Fuels 26, 2497–2504 (2012)
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We are grateful for the financial support from the National Natural Science Foundation of China (Nos. 21276163, 21576168).
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Hu, H., Zhang, T., Yuan, S. et al. Functionalization of multi-walled carbon nanotubes with phenylenediamine for enhanced CO2 adsorption. Adsorption 23, 73–85 (2017). https://doi.org/10.1007/s10450-016-9820-y
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DOI: https://doi.org/10.1007/s10450-016-9820-y