title: Influence of alternating current on the adsorption of indigo carmine.
abstract: The main purpose of this work is to study the effect of a new process of accelerating which consist to couple the electrochemical process with the adsorption to remove an anionic dye, the indigo carmine. That is why, we investigated the effects of the new process of accelerating the adsorption process by using alternating current (AC) on the retention of an anionic dye, the indigo carmine. The adsorption capacity of dye (mg/g) was raised with the raise of current voltage in solution, temperature, and initial indigo carmine concentration and decreased with the increase of initial solution pH, current density, and mass of carbon. The results demonstrate that the removal efficiency of 97.0 % with the current voltage of 15 V is achieved at a current density of 0.014 A/cm2, of pH 2 using zinc as electrodes and contact time of 210 min for adsorption in the presence of AC. Concerning the adsorption without AC, the results obtained showed that for an initial concentration equal to 20 mg/L, more than 95 % amount of adsorbed dye was retained after 405 min of contact in batch system. The comparison between adsorption in the presence and absence of an alternating current shows the importance of the alternating current in the acceleration of the adsorption method and improve the performances of FILTRASORB 200. For both cases, the adsorption mechanism follows the fractal kinetics BSf(n,α) model and the Brouers-Sotolongo isotherm model provides a good fit of the experimental data for both adsorption with and without alternating current.
authors.affiliation: Laboratory of Energy and Materials (LABEM), High School of Sciences and Technology of Hammam Sousse, FP4BATIW project, Sousse University-Tunisia, Hammam, BP 4011, Sousse, Tunisia. aida.kesraoui@gmail.com.|Laboratory of Energy and Materials (LABEM), High School of Sciences and Technology of Hammam Sousse, Sousse University-Tunisia, Hammam, BP 4011, Sousse, Tunisia. aida.kesraoui@gmail.com.
authors.forename: Aida
authors.identifier: http://orcid.org/0000-0002-3155-7106
authors.initials: A
authors.lastname: Kesraoui
authors.affiliation: Laboratory of Energy and Materials (LABEM), High School of Sciences and Technology of Hammam Sousse, Sousse University-Tunisia, Hammam, BP 4011, Sousse, Tunisia.
authors.forename: Taher
authors.initials: T
authors.lastname: Selmi
authors.affiliation: Laboratory of Energy and Materials (LABEM), High School of Sciences and Technology of Hammam Sousse, FP4BATIW project, Sousse University-Tunisia, Hammam, BP 4011, Sousse, Tunisia.|Laboratory of Energy and Materials (LABEM), High School of Sciences and Technology of Hammam Sousse, Sousse University-Tunisia, Hammam, BP 4011, Sousse, Tunisia.
authors.forename: Monig
authors.initials: M
authors.lastname: Seffen
authors.affiliation: Institute of Physics, University of Liège, B5 Sart Tilman, 4000, Liège, Belgium.
authors.forename: François
authors.initials: F
authors.lastname: Brouers
mesh_terms: D000327:Adsorption; D004396:Coloring Agents; D006863:Hydrogen-Ion Concentration; D007203:Indigo Carmine; D007700:Kinetics; D012996:Solutions
chemical_list: D004396:Coloring Agents; D012996:Solutions; D007203:Indigo Carmine
keywords: Activated carbon; Adsorption; Alternating current; Anionic dye; Indigo carmine; Modeling