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Adsorption of carbon dioxide on graphene oxide supported layered double oxides

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Abstract

Adsorption of CO2 on layered double oxides supported on graphene oxide has been studied under dry and wet conditions. In the first exposure to the adsorptive gas, the isotherms obtained for supported and unsupported materials are shown to fit to the Freundlich model indicating the existence of heterogeneous adsorption sites. After multiple temperature-swing cycles, the adsorption capacity decreased and the data is better described by the Langmuir model. The presence of graphene oxide is shown to reduce the loss of adsorption capacity, and helps to maintain the heterogeneity of the basic sites on the adsorbents. The use of wet gas mixtures was found to have a positive effect on the CO2 adsorption capacity of the graphene oxide hybrids. The presence of residual sodium on the materials resulted in a Freundlich isotherm with increased adsorption capacity.

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Abbreviations

b:

Gas–solid interaction parameter in Langmuir isotherm (bar−1)

k:

Pre-factor in Freundlich isotherm (mol \( {\text{kg}}_{\text{ads}}^{ - 1} \)  bar(−1/n))

m:

Monolayer capacity in Langmuir isotherm (mol \( {\text{kg}}_{\text{ads}}^{ - 1} \))

\( m_{a} \) :

Mass of adsorbent within the column (kg)

n :

Fitting parameter in Freundlich isotherm

\( P_{b} \) :

Pressure inside the bed (bar)

\( P_{s} \) :

Standard pressure (bar)

\( P_{{{\text{CO}}_{2f} }} \) :

Partial pressure of CO2 in the feed (bar)

q:

Adsorption capacity (mol CO2  \( {\text{kg}}_{\text{ads}}^{ - 1} \))

\( Q_{Ar - bk} \) :

Volumetric flow rate of argon in the blank test (L min−1)

\( Q_{f} \) :

Volumetric feed flow rate at standard conditions (L min−1)

\( t^{o} \) :

Time to approach the effluent composition \( y_{{{\text{CO}}_{2f} }} \) (min)

\( T_{b} \) :

Temperature inside the bed (K)

\( T_{s} \) :

Standard temperature (K)

\( t_{st} \) :

Stoichiometric time of the column (min)

\( V_{b} \) :

Volume of the bed (L)

\( y_{\text{Ar}} \) :

Mol fraction of Ar at the exit of the column

\( y_{{{\text{Ar}}f}} \) :

Mol fraction of Ar in the feed

\( y_{{{\text{CO}}_{2} }} \) :

Mol fraction of CO2 at the exit of the column

\( y_{{CO_{2f} }} \) :

Mol fraction of CO2 in the feed

\( \varepsilon_{T} \) :

Total porosity

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Acknowledgments

The authors are grateful to Ainara Garcia-Gallastegui and Raul Montesano for discussions and assistance. D.I. thanks CONACyT and SEP for the scholarships awarded.

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Authors and Affiliations

  1. Department of Chemical Engineering, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK

    Diana Iruretagoyena & David Chadwick

  2. Department of Chemistry, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK

    Milo S. P. Shaffer

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  1. Diana Iruretagoyena
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  2. Milo S. P. Shaffer
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  3. David Chadwick
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Correspondence to David Chadwick.

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Iruretagoyena, D., Shaffer, M.S.P. & Chadwick, D. Adsorption of carbon dioxide on graphene oxide supported layered double oxides. Adsorption 20, 321–330 (2014). https://doi.org/10.1007/s10450-013-9595-3

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