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Effect of CO2 activation of carbon xerogels on the adsorption of methylene blue

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Abstract

The effect of physical activation with CO2 of carbon xerogels, synthesized by pyrolysis of a resorcinol-formaldehyde aqueous gel, on the adsorption capacities of Methylene Blue (MB) was studied. The activation with CO2 lead to carbon materials with micropore volumes ranging from \(0.28\ \mathrm{to}\ 0.98~\mathrm{cm}^{3}\,\mathrm{g}_{\mathrm{C}}^{-1}\). MB-adsorption isotherm studies showed that the increase of micropore volume and corresponding surface area led to: (i) a significant improvement in the capacity of MB-adsorption at monolayer coverage, from \(212\ \mathrm{to}\ 714~\mathrm{mg}\,\mathrm{g}_{\mathrm{C}}^{-1}\), and (ii) an increase of the binding energy related to Langmuir isotherm constant up to 45 times greater than those of commercial microporous activated carbons used as reference (NORIT R2030, CALGON BPL and CALGON NC35). It is proposed that the increase of the binding energy results from chemical cleaning of the O-groups onto carbon surface as a consequence of CO2-activation, increasing the π–π interaction between MB and graphene layers of the carbon xerogels. Finally, a series of batch kinetics were performed to investigate the effect of CO2-activation conditions on the mechanism of MB-adsorption. Experimental data were fitted using pseudo-first-order, pseudo-second-order and intraparticle diffusion kinetic models. From pseudo-second-order kinetic model, one observes an increase in the initial rate of MB-adsorption from 0.019 to 0.0565 min−1, by increasing the specific surface area from \(630\ \mathrm{to}\ 2180~\mathrm{m}^{2}\,\mathrm{g}_{\mathrm{C}}^{-1}\) via CO2-activation. Depending on the activation degree of the carbons, two different mechanisms control the MB-adsorption rate: (i) at low activation degree, the intraparticle diffusion is the rate-limiting phenomenon, whereas (ii) at high activation degree, the reactions occurring at the solid/liquid interface are the rate-limiting steps.

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Acknowledgements

C.P. is postdoctoral researcher of the F.R.S.-FNRS (Belgium). The Belgian authors thank the Fonds de Recherche Fondamentale Collective, the Ministère de la Region Wallonne and the Interuniversity Attraction Pole (IAP-P6/17) for their financial support.

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Authors and Affiliations

  1. Laboratory of Chemical Engineering, Department of Applied Chemistry, University of Liège, B6a, 4000, Liège, Belgium

    Carlos A. Páez, María S. Contreras, Angélique Léonard, Silvia Blacher, Jean-Paul Pirard & Nathalie Job

  2. TADiP Group, Department of Thermodynamics and Transport Phenomena, Simón Bolívar University, Caracas, 1080, Venezuela

    María S. Contreras & Claudio G. Olivera-Fuentes

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  1. Carlos A. Páez
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  2. María S. Contreras
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  3. Angélique Léonard
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  5. Claudio G. Olivera-Fuentes
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  6. Jean-Paul Pirard
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  7. Nathalie Job
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Correspondence to Carlos A. Páez.

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Páez, C.A., Contreras, M.S., Léonard, A. et al. Effect of CO2 activation of carbon xerogels on the adsorption of methylene blue. Adsorption 18, 199–211 (2012). https://doi.org/10.1007/s10450-012-9394-2

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