title: Multivariate optimization of the decolorization process by surface modified biomaterial: Box-Behnken design and mechanism analysis.
abstract: A natural biosorbent obtained from Pyracantha coccinea was modified with an anionic surfactant to facilitate its dye removal ability. Modified biosorbent was successfully employed for the decolorization of Methyl Violet (MV)-contaminated solutions. A three-variable Box-Behnken design for response surface methodology was used to examine the function of independent operating variables. Optimum pH and biosorbent amount were found to be 6.0 and 0.055 g, respectively. The effects of temperature and ionic strength on the dye removal performance of biosorbent were also investigated. A biosorption equilibrium was attained within 30 min and experimental data fitted well to the pseudo-second-order model. The Langmuir isotherm model fitted adequately to the equilibrium data. The maximum monolayer biosorption capacity of the modified biosorbent was found to be 254.88 mg g(-1). Good biosorption yields were also recorded in continuous biosorption system. Ion exchange and complexation could be suggested as possible mechanisms for the biosorption. The developed modified biosorbent was regenerated up to 80.30 % by 0.005 M HCl. At real wastewater conditions, it has 86.23 ± 0.21 and 94.51 ± 1.09 % dye removal yields in batch and column systems, respectively. Modified biomaterial can be used as an effective biosorbent for the removal of MV dye from aqueous solution with high biosorption performance.
authors.affiliation: Department of Chemistry, Faculty of Arts and Science, Eskişehir Osmangazi University, Campus of Meşelik, 26480, Eskişehir, Turkey, stunaliakar2@gmail.com.
authors.forename: Sibel Tunali
authors.initials: ST
authors.lastname: Akar
authors.forename: Fatih
authors.initials: F
authors.lastname: Sayin
authors.forename: Serpil
authors.initials: S
authors.lastname: Turkyilmaz
authors.forename: Tamer
authors.initials: T
authors.lastname: Akar
mesh_terms: D000327:Adsorption; D005840:Gentian Violet / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D015999:Multivariate Analysis; D009994:Osmolar Concentration; D028321:Plant Preparations / Q000737:chemistry*; D031991:Pyracantha / Q000737:chemistry; D012967:Sodium Dodecyl Sulfate / Q000737:chemistry; D013499:Surface Properties; D013501:Surface-Active Agents / Q000737:chemistry; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
chemical_list: D028321:Plant Preparations; D013501:Surface-Active Agents; D014874:Water Pollutants, Chemical; D012967:Sodium Dodecyl Sulfate; D005840:Gentian Violet