title: Removal of cationic dyes from aqueous solutions using microspherical particles of fly ash.
abstract: Batch sorption experiments were carried out for the removal of cationic dyes (methylene blue and malachite green) from their aqueous solutions using sorbent made from fly ash-a waste material. Effects of various experimental parameters: initial dye concentration, contact time, pH, adsorbent dosage, solution temperature, surfactant addition and ionic strength on the fly ash sorption of dyes were evaluated. The isothermal data for sorption followed the Langmuir model. The maximum sorption capacity obtained for methylene blue and malachite green was 36.05 mg/g and 40.65 mg/g, respectively. Kinetic studies indicate that sorption on fly ash follows the pseudo-second order kinetics. Present research suggests that fly ash could be an appropriate adsorbent for the removal of basic dyes from aqueous solutions.
authors.affiliation: Department of Chemistry, Wrocław University of Technology, Norwida 4/6, 50-373 Wroclaw, Poland.
authors.forename: Anna
authors.initials: A
authors.lastname: Witek-Krowiak
authors.forename: Roman G
authors.initials: RG
authors.lastname: Szafran
authors.forename: Szymon
authors.initials: S
authors.lastname: Modelski
authors.forename: Anna
authors.initials: A
authors.lastname: Dawiec
mesh_terms: D000327:Adsorption; D060729:Coal Ash / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste; D009994:Osmolar Concentration; D013501:Surface-Active Agents; D013696:Temperature; D013783:Textile Industry; D013816:Thermodynamics; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D060729:Coal Ash; D004396:Coloring Agents; D007220:Industrial Waste; D013501:Surface-Active Agents; D014874:Water Pollutants, Chemical