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Breakthrough curves for toluene adsorption on different types of activated carbon fibers: application in respiratory protection.

Authors
Balanay-JAG; Floyd-EL; Lungu-CT
Source
Ann Occup Hyg 2015 May; 59(4):481-490
NIOSHTIC No.
20045477
Abstract
Activated carbon fibers (ACF) are considered viable alternative adsorbent materials in respirators because of their larger surface area, lighter weight, and fabric form. The purpose of this study was to characterize the breakthrough curves of toluene for different types of commercially available ACFs to understand their potential service lives in respirators. Two forms of ACF, cloth (AC) and felt (AF), with three surface areas each were tested. ACFs were challenged with six toluene concentrations (50-500 p.p.m.) at constant air temperature (23 degrees C), relative humidity (50%), and air flow (16 l min-1) at different bed depths. Breakthrough data were obtained using continuous monitoring by gas chromatography using a gas sampling valve. The ACF specific surface areas were measured by an automatic physisorption analyzer. Results showed unique shapes of breakthrough curves for each ACF form: AC demonstrated a gradual increase in breakthrough concentration, whereas AF showed abrupt increase in concentration from the breakpoint, which was attributed to the difference in fiber density between the forms. AF has steeper breakthrough curves compared with AC with similar specific surface area. AC exhibits higher 10% breakthrough times for a given bed depth due to higher mass per bed depth compared with AF, indicating more adsorption per bed depth with AC. ACF in respirators may be appropriate for use as protection in environments with toluene concentration at the Occupational Safety and Health Administration Permissible Exposure Limit, or during emergency escape for higher toluene concentrations. ACF has shown great potential for application in respiratory protection against toluene and in the development of thinner, lighter, and more efficient respirators.
Keywords
Respirators; Respiratory-protective-equipment; Respiratory-protection; Personal-protective-equipment; Equipment-design; Equipment-reliability; Toluenes; Testing-equipment; Laboratory-testing; Air-filters; Air-flow; Filtration; Performance-capability; Carbon-compounds; Filter-fabrics; Filter-materials; Cloth-filters; Materials-testing; Gases; Vapors; Monitors; Gas-chromatography; Author Keywords: activated carbon fiber; adsorption; breakthrough; respirators; respiratory protection; service life; toluene; Gas-chromatography
Contact
Jo Anne G. Balanay, Environmental Health Sciences Program, Department of Health Education and Promotion, East Carolina University, 300 Curry Court, 3407 Carol Belk Building, Greenville, NC 27858
CODEN
AOHYA3
CAS No.
108-88-3
Publication Date
20150501
Document Type
Journal Article
Email Address
balanayj@ecu.edu
Funding Type
Grant
Fiscal Year
2015
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-T42-OH-008436; Grant-Number-R01-OH-008080; M122014
Issue of Publication
4
ISSN
0003-4878
Source Name
Annals of Occupational Hygiene
State
AL; NC; OK
Performing Organization
University of Alabama at Birmingham
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