Equilibrium Isotherms of Volatile Alkanes, Alkenes, and Ketones on Activated Carbon

Abstract

The sorption of volatile organic compounds (VOCs) on activated carbon was measured. Equilibrium isotherms at 298 K were obtained for n-hexane, cyclohexane, 2-methylpentane, 3-methylpentane, 2,2-dimethylbutane, cyclohexane, 1-hexene, acetone, 2-butanone, and 2-pentanone. The effect of temperature on n-hexane sorption was studied by varying the temperature from (288 to 318) K. Data in this study were collected using a gravimetric apparatus. Some data were replicated with a volumetric apparatus for comparison using an error analysis. For the gravimetric data, it was found that the Langmuir equation (mean deviation 0.020 to 0.025) and the Freundlich equation (mean deviation 0.005 to 0.010) gave good fits of the sorption. Nonpolar or weakly polar sorbates, the sorbates with small steric profiles, or low molecular weight sorbates were more readily adsorbed on the microporous activated carbon. Polar sorbates were more readily adsorbed at high pressure, and low temperature improved the adsorption.

Sorption study of toluene and xylene in aqueous solutions by recycled tires crumb rubber

“…On the other hand, the n value for the sorption of toluene and xylene using CB were 0.642 ± 0.004 and 0.65 ± 0.01 respectively. These values are typical for carbonaceous sorbents [21][22][23]. In turn, the n values for the sorption of toluene and xylene by SBP were close to unity (0.95 ± 0.01 and 0.951 ± 0.003, respectively).…”

“…In order to investigate this possibility, sorption tests for xylene and toluene were carried out by evaluating the sorption behavior of two main components of crumb rubber: CB and SBP. The results for CB at a concentration of 1.5 g/L, (Figure 2b) were well fitted to the Freundlich relationship (Table 2), which is common for carbonaceous sorbents [21]. On the other hand, the sorption behavior of SBP, 3.0 g/L, (Figure 2c) followed a linear relationship that can be attributed to an absorption mechanism rather than an adsorption-based one.…”

Influence of Binders and Lightweight Aggregates on the Properties of Cementitious Mortars: From Traditional Requirements to Indoor Air Quality Improvement

“…The higher the specific surface of the unconventional adsorbent aggregate, the higher is the value of the mortar specific surface. This was verified only in A3 mortars; A3 aggregate has a high quantity of pores smaller than 0.01 µm [ 40 ] and this range of porosity is too small to be detected by MIP.…”

Molecular Dimensions and Porous Structure of Activated Carbons for Sorption of Xylene and Isooctane

“…An error analysis for the gravimetric method was performed according to Lai et al 42. The analysis gives the range of acceptable values of the measurement of adsorbate uptake which will include the true value.…”