Adsorption of methylene chloride vapor on activated carbons

Abstract

A laboratory investigation on the adsorption of hazardous methylene chloride (METH) vapor on the commercial activated carbons BPL and PCB, which were made from bituminous coal and coconut shell, respectively, was conducted at 283, 293, 303, and 313K. The physical properties and surface functional groups of the two activated carbons were also measured and compared with each other. The experimental results indicate that the adsorption capacity of carbon PCB is slightly higher than that of carbon BPL. It was found that the Langmuir, Freundlich, and Dubinin-Radushkevich adsorption equations were well fitted by the measured adsorption data. The values of the parameters of the adsorption equations were determined for the two adsorbents. The physical properties (e.g. micropore volume) of the adsorbents are consistent with the parameters obtained from the adsorption results. A C k K M n nr P 4. pe PO 4 q m R T W WO P J i NOTATION Adsorption potential (J mol-') Adsorbate concentration (mol m-3) Adsorbate liquid density (g cm-3)

Surface characterization and thermodynamics of adsorption of methylene chloride on activated carbons

“…A least square method has been used to determine the Langmuir isotherm parameters of K and q m as reported previously 9 . The values of AG, AH, and AS, computed from Equations (2)-(4), respectively, along with K and q m are listed in Table 2.…”

“…The results were reported as milliequivalents per 100 gram carbon surface area. The chemical titration measurements were also to confirm the acidic functional groups on the carbon surface observed by X-ray photoelectron spectroscopy (XPS) measurements, which have been reported previously 9 .…”

Adsorption and diffusion of argon in disordered nanoporous carbons

“…1. The local crystalline density, or true density, is measured experimentally using helium pycnometry (Tsai and Chang 1994) and is defined as the mean density of the sample divided by the void fraction that is inaccessible to helium gas: ρ true C =ρ C /(1 − V acc /V total ). From the accessible volumes, the densities for the three models were calculated and are summarized in Table 1.…”

Adsorption of ethyl violet dye in aqueous solution by regenerated spent bleaching earth

“…In order to obtain the preliminary information on the adsorption capacity of standard activated carbon as compared to that of RSBE, the granular activated carbon (denoted as PCB) with BET surface area of 1012 m 2 g −1 [28], obtained from Calgon Carbon Co. (Pittsburgh, USA), was studied to obtain its fitting adsorption capacities from the adsorption kinetic experiments at initial ethyl violet concentrations of 10 and 20 mg dm −3 under the conditions of dosage = 0.5 g 2.0 dm −3 , temperature = 25 • C, agitation rate = 400 rpm, and pH 7.0. It was found that the fitting adsorption capacities are 17.83 and 25.91 mg g −1 , respectively.…”