title: Kinetics of adsorption of sulphonated azo dyes on strong basic anion exchangers.
abstract: The macroporous polystyrene anion exchangers Amberlite IRA-900 and Amberlite IRA-910 were used in order to remove sulphonated azo dyes (Allura Red and Sunset Yellow) from aqueous solutions of 100-500 mg/L concentrations. The experimental data obtained at 100, 200, 300 and 500 mg/L initial concentrations at 20 degrees C were applied to the pseudo-first-order, pseudo-second-order and Weber-Morris kinetic models. The calculated sorption capacities (qe,cal) and the rate constant of the first-order adsorption (k1) were determined. The pseudo-second-order kinetic constants (k2) and capacities were calculated from the plots of t/qt vs t, 1/qt vs 1/t, 1/t vs 1/qt, qt/t vs qt and 1/qe-qt vs t for type 1, type 2, type 3, type 4 and type 5 of the pseudo-second-order expression, respectively. The influence of phase contact time, initial dye concentration, solution pH and temperature on Allura Red and Sunset Yellow removal was also discussed.
authors.affiliation: Department of Inorganic Chemistry, Faculty of Chemistry, Maria Curie - Skłodowska University, Maria Curie-Skłodowska Sq. 2, 20-031 Lublin, Poland. m.wawrzkiewicz@op.pl
authors.forename: Monika
authors.initials: M
authors.lastname: Wawrzkiewicz
authors.forename: Zbigniew
authors.initials: Z
authors.lastname: Hubicki
mesh_terms: D000327:Adsorption; D000837:Anion Exchange Resins / Q000737:chemistry*; D001391:Azo Compounds / Q000737:chemistry / Q000302:isolation & purification*; D004396:Coloring Agents / Q000737:chemistry / Q000302:isolation & purification; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste; D007474:Ion Exchange; D007700:Kinetics; D008956:Models, Chemical; D012044:Regression Analysis; D012117:Resins, Synthetic / Q000737:chemistry*; D013696:Temperature; D018508:Water Purification / Q000379:methods*
chemical_list: D000837:Anion Exchange Resins; D001391:Azo Compounds; D004396:Coloring Agents; D007220:Industrial Waste; D012117:Resins, Synthetic; C005915:Allura Red AC Dye; C005842:6-hydroxy-5-((p- sulfophenyl)azo)-2-naphthalenesulfonic acid disodium salt