Supercritical Regeneration of an Activated Carbon Fiber Exhausted with Phenol
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 wastew...
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doaj-1681809ebcb14c899a57e4fb73f57de52020-11-25T02:51:56ZengMDPI AGApplied Sciences2076-34172018-01-01818110.3390/app8010081app8010081Supercritical Regeneration of an Activated Carbon Fiber Exhausted with PhenolM. Jesus Sanchez-Montero0Jennifer Pelaz1Nicolas Martin-Sanchez2Carmen Izquierdo3Francisco Salvador4Dpto Química-Física, Facultad de Ciencias Química, Universidad de Salamanca, Plaza de la Merced s/n, 37008 Salamanca, SpainDpto Química-Física, Facultad de Ciencias Química, Universidad de Salamanca, Plaza de la Merced s/n, 37008 Salamanca, SpainDpto Química-Física, Facultad de Ciencias Química, Universidad de Salamanca, Plaza de la Merced s/n, 37008 Salamanca, SpainDpto Química-Física, Facultad de Ciencias Química, Universidad de Salamanca, Plaza de la Merced s/n, 37008 Salamanca, SpainDpto Química-Física, Facultad de Ciencias Química, Universidad de Salamanca, Plaza de la Merced s/n, 37008 Salamanca, SpainThe 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.http://www.mdpi.com/2076-3417/8/1/81supercritical carbon dioxidesupercritical waterextractionthermal desorption |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
M. Jesus Sanchez-Montero Jennifer Pelaz Nicolas Martin-Sanchez Carmen Izquierdo Francisco Salvador |
spellingShingle |
M. Jesus Sanchez-Montero Jennifer Pelaz Nicolas Martin-Sanchez Carmen Izquierdo Francisco Salvador Supercritical Regeneration of an Activated Carbon Fiber Exhausted with Phenol Applied Sciences supercritical carbon dioxide supercritical water extraction thermal desorption |
author_facet |
M. Jesus Sanchez-Montero Jennifer Pelaz Nicolas Martin-Sanchez Carmen Izquierdo Francisco Salvador |
author_sort |
M. Jesus Sanchez-Montero |
title |
Supercritical Regeneration of an Activated Carbon Fiber Exhausted with Phenol |
title_short |
Supercritical Regeneration of an Activated Carbon Fiber Exhausted with Phenol |
title_full |
Supercritical Regeneration of an Activated Carbon Fiber Exhausted with Phenol |
title_fullStr |
Supercritical Regeneration of an Activated Carbon Fiber Exhausted with Phenol |
title_full_unstemmed |
Supercritical Regeneration of an Activated Carbon Fiber Exhausted with Phenol |
title_sort |
supercritical regeneration of an activated carbon fiber exhausted with phenol |
publisher |
MDPI AG |
series |
Applied Sciences |
issn |
2076-3417 |
publishDate |
2018-01-01 |
description |
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. |
topic |
supercritical carbon dioxide supercritical water extraction thermal desorption |
url |
http://www.mdpi.com/2076-3417/8/1/81 |
work_keys_str_mv |
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