title: Application of statistical design of experiment with desirability function for the removal of organophosphorus pesticide from aqueous solution by low-cost material.
abstract: This paper deals with the multiple response optimization for the removal of organophosphorus pesticide quinalphos [QP: O,O-diethyl O-2-quinoxalinyl phosphorothioate] from the aqueous solution onto low-cost material and tried to overcome the drawbacks of univariate optimization. Used tea leaves were used as low-cost adsorbent and batch equilibration method was followed for this study. A Box-Behnken design was used to develop response model and desirability function was then used for simultaneous optimization of all affecting parameters in order to achieve the highest removal% of quinalphos. The optimum conditions of factors predicted for quinalphos removal% were found to be: pH 8.83, concentration 7 mg L(-1) and dose 0.40 g. Under these conditions, maximum removal% of quinalphos was obtained 96.31%. Considering the above optimum conditions, the adsorption isotherms were developed and provided adsorption capacity of 196.07 microg g(-1) by using Langmuir equation, indicating that used tea leaves may be applied as a low-cost material for pesticides removal from aqueous matrices.
authors.affiliation: Department of Chemistry, University of Ioannina, Ioannina 45110, Greece.
authors.forename: M Azharul
authors.initials: MA
authors.lastname: Islam
authors.forename: Vasilios
authors.initials: V
authors.lastname: Sakkas
authors.forename: Triantafyllos A
authors.initials: TA
authors.lastname: Albanis
mesh_terms: D000327:Adsorption; D003247:Conservation of Natural Resources; D006863:Hydrogen-Ion Concentration; D008962:Models, Theoretical; D009943:Organophosphorus Compounds / Q000302:isolation & purification*; D009946:Organothiophosphorus Compounds / Q000302:isolation & purification; D010575:Pesticides / Q000302:isolation & purification*; D018515:Plant Leaves; D013662:Tea; D014874:Water Pollutants, Chemical / Q000302:isolation & purification; D018508:Water Purification / Q000379:methods*
chemical_list: D009943:Organophosphorus Compounds; D009946:Organothiophosphorus Compounds; D010575:Pesticides; D013662:Tea; D014874:Water Pollutants, Chemical; C009145:quinalphos