The effect of chemical modification of activated carbon cloth on the adsorption capacity of organics and water vapor

Conference · Tue Oct 01 04:00:00 EDT 1996

OSTI ID:370371

Cal, M P; Dimotakis, E; Rood, M J; Larson, S M ^[1]

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1. Univ. of Illinois, Urbana, IL (United States)

Activated Carbon Cloth (ACC) was chemically modified, producing oxidized, chlorinated, and nitrided samples. Adsorption capacities for VOCs from 10 to 1000 ppmv and water vapor from 0 to 95% RH were measured. Oxidized ACC showed an enhanced physical adsorption for acetaldehyde, acetone, and water vapor, probably due to increased dipole-dipole interactions and hydrogen banding. Oxidation of ACC changed the shape of the water vapor adsorption isotherm, so that it no longer resembled a Brunauer type V. Benzene showed a decreased adsorption capacity on oxidized ACC, which may be due to an increase in hydrophilicity of ACC or a change in pore size distribution. Chlorination had little effect on VOC adsorption capacity, except in the case of acetone, where a decrease in adsorption capacity occurred. This may be due to pore blocking by chlorine molecules, or a decrease in hydrogen bonding between the ACC functional groups and acetone. Nitridation of ACC showed little effect on organic adsorption capacity, but increased the saturation adsorption capacity for water vapor on ACC and increased the breadth of its hysteresis loop. These changes were the result of changes in the pore size distribution of the nitrided ACC.

• OSTI ID: 370371
• Report Number(s): CONF-960376--
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
36 MATERIALS SCIENCE
ACETALDEHYDE
ACETONE
ACTIVATED CARBON
ADSORPTION
AIR POLLUTION CONTROL
BENZENE
COMBUSTION PRODUCTS
NITRIDATION
OXIDATION
SORPTIVE PROPERTIES
VOLATILE MATTER
WATER VAPOR