1998
DOI: 10.1061/(asce)0733-9372(1998)124:11(1130)
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Isotherm Equation for Water Vapor Adsorption onto Activated Carbon

Abstract: A simple isotherm model has been developed for the type-5 equilibrium adsorption systems by considering the effects of both primary and secondary adsorptive sites. The model was applied to interpret experimental data describing water vapor adsorption capacities of four activated carbon adsorbents for relative vapor pressures from 0.0 to 0.95 and temperatures between 288 and 308 K. Good agreement was observed between the model and experimental results. The isotherm parameters were found to either correlate well… Show more

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Cited by 24 publications
(17 citation statements)
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“…5 A-C) is reminiscent of the S-shaped adsorption isotherms (i.e., type 5 in the International Union of Pure and Applied Chemistry classification), where the polymer beads of type A of the adsorbed chains act as secondary adsorption sites, leading to the formation of multilayers of adsorbed type A beads. Qi et al (37) proposed an analytical model for the adsorption of water vapor adsorbing onto activated carbon, where the adsorption capacity is governed by the ratio between the actual partial and saturated partial water vapor pressures. We propose a simi-lar model where the protein surface coverage (Γ) and adsorption energy (ε hp ) play similar roles to the adsorption capacity and pressure ratio, respectively:…”
Section: Resultsmentioning
confidence: 99%
“…5 A-C) is reminiscent of the S-shaped adsorption isotherms (i.e., type 5 in the International Union of Pure and Applied Chemistry classification), where the polymer beads of type A of the adsorbed chains act as secondary adsorption sites, leading to the formation of multilayers of adsorbed type A beads. Qi et al (37) proposed an analytical model for the adsorption of water vapor adsorbing onto activated carbon, where the adsorption capacity is governed by the ratio between the actual partial and saturated partial water vapor pressures. We propose a simi-lar model where the protein surface coverage (Γ) and adsorption energy (ε hp ) play similar roles to the adsorption capacity and pressure ratio, respectively:…”
Section: Resultsmentioning
confidence: 99%
“…The maximum adsorption capacity of PPC, near 12 mmol g −1 , is relatively low compared with activated carbons with higher pore volume: it is nearly half of that of the commercial activated carbon BPL or that of a biomass‐based carbon previously evaluated in our group . Compared with zeolites, the main difference comes from the shape of the adsorption isotherms: in the first case, they present high adsorption capacities from very low relative pressures.…”
Section: Resultsmentioning
confidence: 99%
“…Later on, more sophisticated models were proposed by Talu and Meunier (1996), Qi et al (1998), McCallum et al (1999, Do and Do (2000) and Kim et al (2008). These models were proposed to describe the adsorption equilibrium of water on different carbonaceous adsorbents; however, they are not applicable on pentane isotherms on Cu 3 (BTC) 2 due to their special features.…”
Section: Resultsmentioning
confidence: 99%