title: Mixed Hemi/Ad-Micelle Sodium Dodecyl Sulfate-Coated Magnetic Iron Oxide Nanoparticles for the Efficient Removal and Trace Determination of Rhodamine-B and Rhodamine-6G.
abstract: Mixed hemi/ad-micelle sodium dodecyl sulfate (SDS)-coated magnetic iron oxide nanoparticles (MHAMS-MIONPs) were used as an efficient adsorbent for both removal and preconcentration of two important carcinogenic xanthine dyes named rhodamine-B (RB) and rhodamine-6G (RG). To gain insight in the configuration of SDS molecules on the surface of MIONPs, zeta potential measurements were performed in different [SDS]/[MIONP] ratios. Zeta potential data indicated that mixed hemi/ad-micelle MHAM was formed in [SDS]/[MIONP] ratios over the range of 1.1 to 7.3. Parameters affecting the adsorption of dyes were optimized as removal efficiency by one variable at-a-time and response surface methodology; the obtained removal efficiencies were ∼100%. Adsorption kinetic and equilibrium studies, under the optimum condition (pH = 2; amount of MIONPs = 87.15 mg; [SDS]/[MIONP] ratio = 2.9), showed that adsorption of both dyes are based on the pseudo-second-order and the Langmuir isotherm models, respectively. The maximum adsorption capacities for RB and RG were 385 and 323 mg g(-1), respectively. MHAMS-MIONPs were also applied for extraction of RB and RG. Under optimum conditions (pH = 2; amount of damped MHAMS-MIONPs = 90 mg; eluent solvent volume = 2.6 mL of 3% acetic acid in acetonitrile), extraction recoveries for 0.5 mg L(-1) of RB and RG were 98% and 99%, with preconcentration factors of 327 and 330, respectively. Limit of detection obtained for rhodamine dyes were <0.7 ng mL(-1). Finally, MHAMS-MIONPs were successfully applied for both removal and trace determination of RB and RG in environmental and wastewater samples.
authors.affiliation: †AXES, Department of Chemistry, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium.|‡Department of Analytical Chemistry, Faculty of Chemistry, University of Mazandaran, Babolsar 47416-95447, Iran.
authors.forename: Elias
authors.initials: E
authors.lastname: Ranjbari
authors.affiliation: ‡Department of Analytical Chemistry, Faculty of Chemistry, University of Mazandaran, Babolsar 47416-95447, Iran.
authors.forename: Mohammad Reza
authors.initials: MR
authors.lastname: Hadjmohammadi
authors.affiliation: §Department Pharmaceutics, Campus Drie Eiken, University of Antwerp, Antwerp, Belgium.
authors.forename: Filip
authors.initials: F
authors.lastname: Kiekens
authors.affiliation: ‡Department of Analytical Chemistry, Faculty of Chemistry, University of Mazandaran, Babolsar 47416-95447, Iran.
authors.forename: Karolien
authors.initials: K
authors.lastname: De Wael
mesh_terms: D004784:Environmental Monitoring / Q000379:methods*; D005290:Ferric Compounds / Q000737:chemistry*; D005618:Fresh Water / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D057230:Limit of Detection; D008280:Magnetics; D053768:Metal Nanoparticles / Q000737:chemistry*; D008823:Micelles; D012235:Rhodamines / Q000032:analysis* / Q000302:isolation & purification; D012967:Sodium Dodecyl Sulfate / Q000737:chemistry*; D062065:Wastewater / Q000737:chemistry
chemical_list: D005290:Ferric Compounds; D008823:Micelles; D012235:Rhodamines; D012967:Sodium Dodecyl Sulfate; D062065:Wastewater; C026188:rhodamine 6G; C000499:ferric oxide; C029773:rhodamine B