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Appl. Sci. 2018, 8(1), 81; doi:10.3390/app8010081

Supercritical Regeneration of an Activated Carbon Fiber Exhausted with Phenol

Dpto Química-Física, Facultad de Ciencias Química, Universidad de Salamanca, Plaza de la Merced s/n, 37008 Salamanca, Spain
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Received: 27 November 2017 / Revised: 12 December 2017 / Accepted: 13 December 2017 / Published: 9 January 2018
(This article belongs to the Special Issue The Applications of Supercritical Carbon Dioxide)
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Abstract

The properties of supercritical CO2 (SCCO2) and supercritical water (SCW) turn them into fluids with a great ability to remove organic adsorbates retained on solids. These properties were used herein to regenerate an activated carbon fiber (ACF) saturated with a pollutant usually contained in wastewater and drinking water, phenol. Severe regeneration conditions, up to 225 bar and 400 °C, had to be employed in SCCO2 regeneration to break the strong interaction established between phenol and the ACF. Under suitable conditions (regeneration temperature, time, and pressure, and flow of SCCO2) the adsorption capacity of the exhausted ACF was completely recovered, and even slightly increased. Most of the retained phenol was removed by thermal desorption, but the extra percentage removed by extraction allowed SCCO2 regeneration to be significantly more efficient than the classical thermal regeneration methods. SCCO2 regeneration and SCW regeneration were also compared for the first time. The use of SCW slightly improved regeneration, although SCW pressure was thrice SCCO2 pressure. The pathways that controlled SCW regeneration were also investigated. View Full-Text
Keywords: supercritical carbon dioxide; supercritical water; extraction; thermal desorption supercritical carbon dioxide; supercritical water; extraction; thermal desorption
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Sanchez-Montero, M.J.; Pelaz, J.; Martin-Sanchez, N.; Izquierdo, C.; Salvador, F. Supercritical Regeneration of an Activated Carbon Fiber Exhausted with Phenol. Appl. Sci. 2018, 8, 81.

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