title: Adsorption process of methyl orange dye onto mesoporous carbon material-kinetic and thermodynamic studies.
abstract: The mesoporous carbon CMK-3 adsorbent was prepared, characterized, and used for the removal of anionic methyl orange dye from aqueous solution. Adsorption experiments were carried out as batch studies at different contact time, pH, initial dye concentration, and salt concentration. The dye adsorption equilibrium was rapidly attained after 60 min of contact time. Removal of dye in acidic solutions was better than in basic solutions. The adsorption of dye increased with increasing initial dye concentration and salt concentration. The equilibrium data were analyzed by the Langmuir and Freundlich models, which revealed that Langmuir model was more suitable to describe the methyl orange adsorption than Freundlich model. Experimental data were analyzed using pseudo-first-order and pseudo-second-order kinetic models. It was found that kinetics followed a pseudo-second-order equation. Thermodynamic study showed that the adsorption was a spontaneous and exothermic process.
authors.affiliation: Iranian Research & Development Center for Chemical Industries, Academic Center for Education, Culture and Research (ACECR), Tehran, Iran.
authors.forename: Nourali
authors.initials: N
authors.lastname: Mohammadi
authors.forename: Hadi
authors.initials: H
authors.lastname: Khani
authors.forename: Vinod Kumar
authors.initials: VK
authors.lastname: Gupta
authors.forename: Ehsanollah
authors.initials: E
authors.lastname: Amereh
authors.forename: Shilpi
authors.initials: S
authors.lastname: Agarwal
mesh_terms: D000327:Adsorption; D001391:Azo Compounds / Q000737:chemistry* / Q000302:isolation & purification; D002244:Carbon / Q000737:chemistry*; D004396:Coloring Agents; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D009994:Osmolar Concentration; D016062:Porosity; D013816:Thermodynamics
chemical_list: D001391:Azo Compounds; D004396:Coloring Agents; C100258:methyl orange; D002244:Carbon