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Comparison of adsorption of Remazol Black B and Acidol Red on microporous activated carbon felt

TitleComparison of adsorption of Remazol Black B and Acidol Red on microporous activated carbon felt
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2009
AuthorsDonnaperna, L., Duclaux L., Gadiou R., Hirn M.-P., Merli C., and Pietrelli L.
JournalJournal of Colloid and Interface Science
Volume339
Pagination275-284
ISSN00219797
Keywordsacidity, acidol red, Acidol Red 2BE-NW, Activated carbon, Activated carbon felt, Activated carbon treatment, Adsorption, Adsorption capacities, Adsorption isotherms, Adsorption kinetics, Adsorption rates, Anionic dye, article, Atmospheric temperature, Boehm titration, Carbon black, Carbon material, Carbon surface chemistry, Charcoal, chemical interaction, chemical structure, Chemicals removal (water treatment), controlled study, Dewatering, diffusion, Direct interactions, dye, Dye molecule, Dyes, Electricity, Electrostatic interactions, Experimental data, External surfaces, Felt, Felts, Fourier transformation, Freundlich models, Functional groups, Intra-particle diffusion, Intraparticle diffusion models, isotherm, Langmuirs, Mean pore size, Micropores, Microporosity, Microporous, Microporous activated carbons, Oxygen, oxygenation, pH, PH dependence, pH effects, pH value, Pore size, Porosity, priority journal, Process control, Rate of adsorption, Remazol Black B, Slow diffusion, Surface area, Surface chemistry, Surface diffusion, surface property, Surfaces, Temperature, Thermodynamic parameter, thermodynamics, titrimetry, unclassified drug, X ray analysis, X-ray microanalysis
Abstract

The adsorption of two anionic dyes, Remazol Black B (RB5) and Acidol Red 2BE-NW (AR42), onto a microporous activated carbon felt was investigated. The characterization of carbon surface chemistry by X-ray microanalysis, Boehm titrations, and pH-PZC measurements indicates that the surface oxygenated groups are mainly acidic. The rate of adsorption depends on the pH and the experimental data fit the intraparticle diffusion model. The pore size distribution obtained by DFT analysis shows that the mean pore size is close to 1 nm, which indicates that a slow intraparticle diffusion process control the adsorption. The adsorption isotherms were measured for different pH values. The Khan and the Langmuir-Freundlich models lead to the best agreement with experimental data for RB5 and AR42, respectively. These isotherm simulations and the pH dependence of adsorption show that the adsorption capacity is mainly controlled by nondispersive electrostatic interactions for pH values below 4. The adsorption kinetics, the irreversibility of the process, and the influence of the pH indicate that the rate of adsorption in this microporous felt proceeds through two steps. The first one is fast and results from direct interaction of dye molecules with the external surface of the carbon material (which account for 10% of the whole surface area); in the second, slow step, the adsorption rate is controlled by the slow diffusion of dye molecules into the narrow micropores. The influence of temperature on the adsorption isotherms was studied and the thermodynamic parameters were obtained. They show that the process is spontaneous and exothermic. © 2009 Elsevier Inc. All rights reserved.

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URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-70349459606&doi=10.1016%2fj.jcis.2009.07.057&partnerID=40&md5=c37b087694d836311358b7aed9826a65
DOI10.1016/j.jcis.2009.07.057
Citation KeyDonnaperna2009275