The adsorption of water vapor on a highly microporous carbon
derived from the carbonization of coconut
shell has been studied. This material was characterized by the
adsorption of nitrogen at 77 K and carbon
dioxide at 273 K. The micropore size distribution was determined
using probe molecule vapors at
p/p
0
= 0.5 and 301 K. The adsorption and desorption characteristics
of water vapor on the activated carbon
were investigated over the pressure range 0−2.41 kPa
(p/p
0 0−0.9) in a static water
vapor system. The
adsorption and desorption kinetics were studied with different amounts
of preadsorbed water for changes
in vapor pressure of 0.303 kPa. The adsorption rate constants were
also studied for three relative humidities
for a dynamic flow system at a constant temperature. In these
experiments the changes in vapor pressure
were much higher than in the static vapor pressure experiments.
The kinetic results for both the static
atmosphere and dynamic flow systems are discussed in relation to their
relative position on the equilibrium
isotherm and the adsorption/desorption mechanism.
The adsorption of water vapor on a highly microporous
coconut-shell-derived carbon and a mesoporous
wood-derived carbon was studied. These carbons were chosen as they
had markedly different porous
structures. The adsorption and desorption characteristics of water
vapor on the activated carbons were
investigated over the relative pressure range
p/p° = 0−0.9 for temperatures in the range
285−313 K in
a static water vapor system. The adsorption isotherms were
analyzed using the Dubinin−Serpinski equation,
and this provided an assessment of the polarity of the carbons.
The kinetics of water vapor adsorption
and desorption were studied with different amounts of preadsorbed water
for set changes in pressure
relative to the saturated vapor pressure
(p/p°). The adsorption kinetics for each
relative pressure step
were compared and used to calculate the activation energies for the
vapor pressure increments. The
kinetic results are discussed in relation to their relative position on
the equilibrium isotherm and the
adsorption mechanism of water vapor on activated carbons.
Assessment of societal risk perception is a different process compared to traditional risk assessment based on probabilistic risk evaluation methods. Where uncertainty and subjectivity exist, a structured decision making method that can capture public risk perception would help designers to progress toward sustainable product design. In this article a multiple attribute decision making methodology is tested using two groups of experts to assess possible public perceptions of gasification plants. Issues associated with the methodology are discussed.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.