Adsorption Equilibria of Chlorinated Organic Solvents onto Activated Carbon

Abstract

Adsorption equilibria of dichloromethane, 1,1,1-trichloroethane, and trichloroethylene on activated carbon were obtained by a static volumetric technique. Isotherms were measured for the pure vapors in the temperature range from 283 to 363 K and pressures up to 60 kPa for dichloromethane, 16 kPa for 1,1,1-trichloroethane, and 7 kPa for trichloroethylene, respectively. The Toth and Dubinin−Radushkevich equations were used to correlate experimental isotherms. Thermodynamic properties such as the isosteric heat of adsorption and the Henry's constant were calculated. It was found that the values of isosteric heat of adsorption were varied with surface loading. Also, the Henry's constant showed that the order of adsorption affinity is 1,1,1-trichloroethane, trichloroethylene, and dichloromethane. By employing the Dubinin−Radushkevich equation, the limiting volume of the adsorbed space, which equals micropore volume, was determined, and its value was found to be approximately independent of adsorbates.

Comparison of sorbents and isotherm models for NH3‐gas separation by adsorption

“…The HBT equation is used, since Reich et al recommend it, although the Rackett equation has been more popular with potential the-Ž . ory models Mehta and Danner, 1985;Yun et al, 1998 . Saturated vapor pressures are calculated by the Antoine equa-Ž .…”

Fabrication, characterization and corrosion feature evaluation of mild steel in 1 M HCl by nanoparticle-modified activated carbon

“…Despite its high energy density, long life and fast charging capacity, AC is categorized as an electric double-layer capacitor (EDLC), which means that energy can be stored at the electrolyte/electrolyte double-layer interface (Ali et al 2019a,b;Simon et al 2012;Yan 2014). Based on a review of the literature, it is safe to assume that the majority of AC research to date have focused on equilibrium conditions, with the primary goal of these studies being the establishment of an acceptable adsorption isotherm for pollutant removal (Cal et al 1994;Yun et al 1998). Limited researchers (Yun et al 1998;Tanthapanichakoon et al 2005) have observed iron corrosion prevention by AC phenomenally; however, there is a deficiency in basic research on the preservation properties of AC.…”

“…Based on a review of the literature, it is safe to assume that the majority of AC research to date have focused on equilibrium conditions, with the primary goal of these studies being the establishment of an acceptable adsorption isotherm for pollutant removal (Cal et al 1994;Yun et al 1998). Limited researchers (Yun et al 1998;Tanthapanichakoon et al 2005) have observed iron corrosion prevention by AC phenomenally; however, there is a deficiency in basic research on the preservation properties of AC. The purpose of this study was to determine the applicability of AC in the prevention of iron corrosion under various situations and to investigate the mechanism behind the process.…”

Adsorption of Gas Phase Organic Compounds by Swellable Organically Modified Silica

“…Developing materials for the adsorption of volatile organic compounds (VOCs) from air is important for improving separations for industrial processing and environmental protection. A wide variety of porous solids have been studied for VOC capture, including activated carbon, − polymeric resins, − zeolites, organoclays, and hydrophobic aerogels. − Development of new types of adsorbents typically addresses improvement of total adsorption capacity and rate of adsorption as primary objectives. In addition to these parameters, reversible adsorption and chemical selectivity are also important factors in developing sorbents for VOC capture.…”