ADSORPTION-DESORPTION PROPERTIES OF SORBENTS.
Abstract
Water adsorption and desorption isotherms at 25C are reported for a coal-base granular activated carbon, activated carbon, activated carbon fibers made from Fortisan and viscose rayons, and highly activated coconut shell charcoals. Isotherm shapes correlate well with pore structures. Observed saturation capacities for water imply that the density of adsorbed water is approximately 10% less than that of liquid water. Further adsorption and desorption isotherms of dimethyl methylphosphonate, DMMP, on a highly activated coconut shell charcoal are reported. These measurements confirm a previously reported reduction in DMMP capacity upon grinding the granular sample to a fine powder. Isosteric heats of adsorption of DMMP on the coconut shell charcoals are seen to be significantly lower than on the other carbons listed above which were previously studied. This is consistent with observed differences in pore structure and isotherm steepnesses among the samples. Apparatus has been installed and calibrated for flow adsorption evaluation of sorbent pads. This embodies a converted E-2 canister tester in conjunction with a gas chromatograph. A gas chromatographic method for the determination of low concentrations of DMMP in air is described. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 06, 1964
- Accession Number
- AD0607076
Entities
People
- A. W. Loven
- F. J. Vermillion