Adsorption of Acetone, Methyl Ethyl Ketone, 1,1,1-Trichloroethane, and Trichloroethylene in Granular Activated Carbons

Abstract

The adsorption isotherms of two oxygenated and two chlorinated volatile organic compounds, namely acetone, methyl ethyl ketone, 1,1,1-trichloroethane, and trichloroethylene, were determined at 298 K, by the gravimetric technique, in four granular activated carbons. The textural properties of the adsorbents were evaluated from low-temperature nitrogen adsorpion. The Dubinin−Astakhov equation was used to fit the data, and a discussion of the results was made on the basis of relevant physical properties of the adorbate molecules.

Synthesis and characterization of polyurethane foam matrices for the support of granular adsorbent materials

“…Their effectiveness for the retention of VOCs and a more detailed characterization are discussed elsewhere. 48 Nitrogen adsorption isotherms in the activated carbons, presented in Figure 8, were determined before and after they were supported on the polyurethane foam. For that purpose, samples of the supported pellets were collected from the polyurethane matrix.…”

Adsorption of Volatile Organic Compounds on Zeolite L

“…25−27 The DA equation has been extensively applied to the adsorption of vapors in microporous materials. 22,27,28 Additionally, the Toth equation, although originally proposed for monolayer adsorption, is believed to give a more extensive range of fit than the Langmuir or Freundlich isotherm equations when applied to type I isotherms for microporous adsorbents. 26,29,30 The Toth equation also has the advantage over the Sips equation in that it appears to satisfy the thermodynamic limits.…”

“…Analyses of the VOC adsorption isotherms were made by the Dubinin–Astakhov (DA) and Tóth equations. − The DA equation has been extensively applied to the adsorption of vapors in microporous materials. ,, Additionally, the Tóth equation, although originally proposed for monolayer adsorption, is believed to give a more extensive range of fit than the Langmuir or Freundlich isotherm equations when applied to type I isotherms for microporous adsorbents. ,, The Tóth equation also has the advantage over the Sips equation in that it appears to satisfy the thermodynamic limits. , The DA equation had an empirical nature when proposed, however, some authors consider that the DA equation can have a theoretical justification . This equation has the form where q is the amount adsorbed at temperature T and relative pressure p/p 0 , q m is the limiting adsorption in the micropores, A is the adsorption potential ( A = RT ln­( P 0 /P )), and n and E are temperature invariant parameters.…”

“…The consequences for the environment and human health of VOC emissions are well known. ,, Among the methodologies to reduce the VOC content in ambient air, adsorption is one of the least expensive methods with a removal efficiency higher than 90% . Studies of adsorption of VOCs in zeolitic materials other than zeolite L, and also in other adsorbent types such as carbonaceous-based materials, have been presented previously ,− Important in this context of the adsorption of VOCs, which are frequently flammable substances, is the fact that zeolitic structures are stable until reaching high temperatures, even if in some cases they can present lower adsorption capacities than, for instance, carbonaceous-based materials …”

Physical Adsorption of H2S Related to the Conservation of Works of Art: The Role of the Pore Structure at Low Relative Pressure

“…For the majority of samples, the values for A BET and V DR were previously presented byPires et al (2003). For the majority of samples, the values for A BET and V DR were previously presented byPires et al (2003).…”