Separation Processes Based on Electrosorption Phenomena

Grévillot, Georges

doi:10.1007/978-94-009-2263-1_11

Cited by 6 publications

(1 citation statement)

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“…In 1989 Grevillot defined "electrosorption" as the reversible adsorption, or the reversible retention, of ions, molecules, and particles from a liquid phase on or near an electronic conducting surface as a function of the electric potential difference between the surface and the liquid [9]. From this first definition, which was related only to liquid-solid adsorption, Su and Hatton broadened the definition to all those phenomena in which this surface-binding process is promoted, or aided, by the presence of an electrical field [10].…”

Section: Electrosorptionmentioning

confidence: 99%

Electroadsorptive Removal of Gaseous Pollutants

2019

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Adsorption is a consequence of surface energy distribution, and the existence of electrostatic bonding suggests that the presence of an external electric field may affect adsorbate/adsorbent interactions. Nevertheless, this aspect has been poorly studied in the literature, except under non-thermal plasma or corona discharge conditions. After having demonstrated in our previous work that the adsorption kinetics of gaseous organic compounds can be enhanced by the presence of an external applied electric field, in this study, we focus on the influence of the electric field on adsorbent and adsorptive interactions. By using a commercially available activated carbon cloth, in addition to increasing the adsorbent mass transfer coefficient by virtue of the increasing intensity of the applied electric field, the results suggest that adsorbent morphology is only influenced by the formation of new surface functional groups. Moreover, enhanced adsorption kinetics and capacity may result from the electrohydrodynamic force induced by the movement of charged and neutral particles towards the adsorbent, as confirmed by the reversibility of the process. Such enhancement results in a negligible increase, of about 3%, in adsorption capacity (i.e., from 91 mmol m−2 Pa−1 for only adsorption to 94 mmol m−2 Pa−1 in the presence of the applied electric field), but also in a dramatic doubling of adsorption kinetics (i.e., from 0.09 min−1 for only adsorption to 0.19 min−1 in the presence of the applied electric field). In reality, the application of an electric field to an activated carbon cloth leads to faster adsorption kinetics, without substantially altering its adsorption capacity.

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Section: Electrosorptionmentioning

confidence: 99%