title: Native, acidic pre-treated and composite clay efficiency for the adsorption of dicationic dye in aqueous medium.
abstract: Environmental applications of composites have attracted the interests of researchers due to their excellent adsorption efficiency for pollutants. Native, HCl pre-treated clay and MnFe2O4/clay composite were investigated as an adsorbent for removal of methyl green from aqueous solution. The adsorption behaviors of dye onto native, HCl pre-treated and composite clays were studied as a function of contact time, adsorbent dose, pH, initial dye concentration and temperature. Maximum dye adsorption of 44 mg/g was achieved at pH of 8, contact time 40 min, adsorbent dose 0.20 g/L and initial dye concentration of 125 mg/L using clay composite. The Langmuir isotherm and pseudo-second-order kinetic model best explained the methyl green dye adsorption onto clay adsorbents. Thermodynamic parameters revealed the endothermic and spontaneous adsorption nature of dye. From results, it is concluded that clay has potential for adsorbing methyl green and can be used for the removal of dyes from industrial effluents.
authors.affiliation: Department of Chemistry, University of Agriculture, Faisalabad 38000, Pakistan.
authors.forename: Asma
authors.initials: A
authors.lastname: Ehsan
authors.affiliation: Department of Chemistry, University of Agriculture, Faisalabad 38000, Pakistan.
authors.forename: Haq Nawaz
authors.initials: HN
authors.lastname: Bhatti
authors.affiliation: Department of Chemistry, The University of Lahore, Lahore, Pakistan E-mail: bosalvee@yahoo.com.
authors.forename: Munawar
authors.initials: M
authors.lastname: Iqbal
authors.affiliation: Department of Chemistry, University of Agriculture, Faisalabad 38000, Pakistan.
authors.forename: Saima
authors.initials: S
authors.lastname: Noreen
mesh_terms: D000327:Adsorption; D000538:Aluminum Silicates / Q000737:chemistry*; D002413:Cations, Divalent; D000077215:Clay; D004396:Coloring Agents / Q000032:analysis* / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008962:Models, Theoretical; D013696:Temperature; D013816:Thermodynamics; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry; D018508:Water Purification / Q000379:methods*
chemical_list: D000538:Aluminum Silicates; D002413:Cations, Divalent; D004396:Coloring Agents; D014874:Water Pollutants, Chemical; D000077215:Clay