title: The effects of aging on the dynamic adsorption of hazardous organic vapors on impregnated activated carbon.
abstract: The effects of an eight-year natural aging of ASC impregnated activated carbon on the adsorption capacity and breakthrough times of model organic vapors and of the nerve agent sarin were investigated. Aging delayed methanol breakthrough from dry air on pre-dried carbon, but shortened the breakthrough time of both methanol and hexane under relative humidity (RH) of 30-85% on pre-humidified carbon. Aging also shortened the breakthrough time of the less volatile model compound 2-methoxyethanol, especially under RH of 60-85%. Aging significantly reduced the protection capacity against sarin at RH of 85%. The effects of aging on physisorption are attributed to enhanced hydrogen-bonding capability and strength of the interaction between water and adsorption sites on the carbon surface.
authors.affiliation: a Department of Physical Chemistry , Israel Institute for Biological Research , Ness-Ziona , Israel.
authors.forename: Tal
authors.initials: T
authors.lastname: Amitay-Rosen
authors.forename: Amir
authors.initials: A
authors.lastname: Leibman
authors.forename: Ido
authors.initials: I
authors.lastname: Nir
authors.forename: Amalia
authors.initials: A
authors.lastname: Zaltsman
authors.forename: Doron
authors.initials: D
authors.lastname: Kaplan
mesh_terms: D000327:Adsorption; D000393:Air Pollutants / Q000737:chemistry*; D000395:Air Pollutants, Occupational / Q000737:chemistry; D002244:Carbon / Q000737:chemistry*; D002619:Chemical Warfare Agents / Q000737:chemistry; D015386:Hazardous Substances / Q000737:chemistry*; D006813:Humidity; D008956:Models, Chemical; D009930:Organic Chemicals / Q000737:chemistry*; D012134:Respiratory Protective Devices; D012524:Sarin / Q000737:chemistry; D013997:Time Factors
chemical_list: D000393:Air Pollutants; D000395:Air Pollutants, Occupational; D002619:Chemical Warfare Agents; D015386:Hazardous Substances; D009930:Organic Chemicals; D002244:Carbon; D012524:Sarin
keywords: physisorption; protective capacity; vapor breakthrough