title: Application of AlMCM-41 for competitive adsorption of methylene blue and rhodamine B: Thermodynamic and kinetic studies.
abstract: AlMCM-41 was applied for adsorption of methylene blue (MB) and rhodamine B (RB) in single and binary component systems. In the single component systems, AlMCM-41 represents higher adsorption capacity for MB than RB with the maximal adsorption capacity of 2.08x10(-4) and 8.74x10(-5)mol/g at 25 degrees C for MB and RB, respectively. In the binary component system, MB and RB exhibit competitive adsorption onto the adsorbent. The adsorption is approximately reduced to 94 and 79% of single component adsorption systems for MB and RB (initial concentration of 8x10(-6)M) at 25 degrees C. In single and binary component systems, kinetic and adsorption isotherm studies demonstrate that the data are following pseudo-second-order kinetic model and Langmuir isotherm. Effect of solution pH on the adsorption in single and binary component systems was studied and the results were described by electrostatic interactions.
authors.affiliation: Department of Chemistry, University of Mohaghegh Ardabili, P.O. Box 179, Ardabil, Iran.
authors.forename: S
authors.initials: S
authors.lastname: Eftekhari
authors.forename: A
authors.initials: A
authors.lastname: Habibi-Yangjeh
authors.forename: Sh
authors.initials: Sh
authors.lastname: Sohrabnezhad
mesh_terms: D000327:Adsorption; D004396:Coloring Agents; D006863:Hydrogen-Ion Concentration; D007202:Indicators and Reagents; D007700:Kinetics; D008751:Methylene Blue / Q000737:chemistry*; D015233:Models, Statistical; D012015:Reference Standards; D012235:Rhodamines / Q000737:chemistry*; D017640:Silicates / Q000737:chemistry*; D013816:Thermodynamics
chemical_list: D004396:Coloring Agents; D007202:Indicators and Reagents; D012235:Rhodamines; D017640:Silicates; C029773:rhodamine B; D008751:Methylene Blue