Regeneration of Impregnated Activated Carbon after Aging
Impregnated activated carbon (IAC) is an efficient adsorbent for the filtration of hazardous gases from the air. However, it tends to lose its efficiency after exposure to high humidity, where it adsorbs water molecules. Water adsorption causes changes in metal impregnation, resulting in a loss of a...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-12-01
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| Series: | Environments |
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| Online Access: | https://www.mdpi.com/2076-3298/10/12/214 |
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| author | Ido Nir Vladislav Shepelev Lilach Rosh Amir Lybman Liat Aviram Tal Amitay-Rosen Hadar Rotter |
| author_facet | Ido Nir Vladislav Shepelev Lilach Rosh Amir Lybman Liat Aviram Tal Amitay-Rosen Hadar Rotter |
| author_sort | Ido Nir |
| collection | DOAJ |
| description | Impregnated activated carbon (IAC) is an efficient adsorbent for the filtration of hazardous gases from the air. However, it tends to lose its efficiency after exposure to high humidity, where it adsorbs water molecules. Water adsorption causes changes in metal impregnation, resulting in a loss of adsorption efficiency for certain toxic gases, particularly gases that are adsorbed via chemisorption. Here, an innovative method was developed for the regeneration and reactivation of aged IAC. The method is based on dripping a regeneration solution composed of ammonium hydroxide and ammonium carbonate onto the aged IAC. The developed regeneration method was applied to ASZMT, a common commercially used IAC, that had undergone accelerated aging for six months. After the regeneration process, the protection capacity of the IAC against cyanogen chloride (CK) and toluene was almost fully restored to its initial value. Elemental analysis by energy dispersive X-ray spectroscopy (EDX) and X-ray photoelectron spectroscopy (XPS) showed that after the regeneration procedure, the concentrations of zinc and copper on the external surface of the IAC were decreased. This provides evidence that they were partially incorporated back into the pores. It is reasonable to believe that the developed method can be applied to IACs other than ASZMT impregnated with different kinds of materials. The implementation of this method has economic and environmental consequences. In the future, it may allow the reuse of aged IAC and even the restoration of filters. |
| first_indexed | 2024-03-08T20:48:05Z |
| format | Article |
| id | doaj.art-c54169c527db467d9f63dd7c51685fb5 |
| institution | Directory Open Access Journal |
| issn | 2076-3298 |
| language | English |
| last_indexed | 2024-03-08T20:48:05Z |
| publishDate | 2023-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Environments |
| spelling | doaj.art-c54169c527db467d9f63dd7c51685fb52023-12-22T14:07:39ZengMDPI AGEnvironments2076-32982023-12-01101221410.3390/environments10120214Regeneration of Impregnated Activated Carbon after AgingIdo Nir0Vladislav Shepelev1Lilach Rosh2Amir Lybman3Liat Aviram4Tal Amitay-Rosen5Hadar Rotter6Department of Physical Chemistry, Israel Institute for Biological Research, P.O. Box 19, Ness Ziona 74100, IsraelLife Science Research Israel Ltd., P.O. Box 19, Ness Ziona 74100, IsraelDepartment of Physical Chemistry, Israel Institute for Biological Research, P.O. Box 19, Ness Ziona 74100, IsraelDepartment of Physical Chemistry, Israel Institute for Biological Research, P.O. Box 19, Ness Ziona 74100, IsraelDepartment of Physical Chemistry, Israel Institute for Biological Research, P.O. Box 19, Ness Ziona 74100, IsraelDepartment of Physical Chemistry, Israel Institute for Biological Research, P.O. Box 19, Ness Ziona 74100, IsraelDepartment of Physical Chemistry, Israel Institute for Biological Research, P.O. Box 19, Ness Ziona 74100, IsraelImpregnated activated carbon (IAC) is an efficient adsorbent for the filtration of hazardous gases from the air. However, it tends to lose its efficiency after exposure to high humidity, where it adsorbs water molecules. Water adsorption causes changes in metal impregnation, resulting in a loss of adsorption efficiency for certain toxic gases, particularly gases that are adsorbed via chemisorption. Here, an innovative method was developed for the regeneration and reactivation of aged IAC. The method is based on dripping a regeneration solution composed of ammonium hydroxide and ammonium carbonate onto the aged IAC. The developed regeneration method was applied to ASZMT, a common commercially used IAC, that had undergone accelerated aging for six months. After the regeneration process, the protection capacity of the IAC against cyanogen chloride (CK) and toluene was almost fully restored to its initial value. Elemental analysis by energy dispersive X-ray spectroscopy (EDX) and X-ray photoelectron spectroscopy (XPS) showed that after the regeneration procedure, the concentrations of zinc and copper on the external surface of the IAC were decreased. This provides evidence that they were partially incorporated back into the pores. It is reasonable to believe that the developed method can be applied to IACs other than ASZMT impregnated with different kinds of materials. The implementation of this method has economic and environmental consequences. In the future, it may allow the reuse of aged IAC and even the restoration of filters.https://www.mdpi.com/2076-3298/10/12/214adsorptionfiltrationagingregenerationreactivationimpregnation |
| spellingShingle | Ido Nir Vladislav Shepelev Lilach Rosh Amir Lybman Liat Aviram Tal Amitay-Rosen Hadar Rotter Regeneration of Impregnated Activated Carbon after Aging Environments adsorption filtration aging regeneration reactivation impregnation |
| title | Regeneration of Impregnated Activated Carbon after Aging |
| title_full | Regeneration of Impregnated Activated Carbon after Aging |
| title_fullStr | Regeneration of Impregnated Activated Carbon after Aging |
| title_full_unstemmed | Regeneration of Impregnated Activated Carbon after Aging |
| title_short | Regeneration of Impregnated Activated Carbon after Aging |
| title_sort | regeneration of impregnated activated carbon after aging |
| topic | adsorption filtration aging regeneration reactivation impregnation |
| url | https://www.mdpi.com/2076-3298/10/12/214 |
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