Research Info

Home /Mixed hemi/ad-micelle ...
Title Mixed hemi/ad-micelle SDS-coated magnetic iron oxide nanoparticles for the efficient removal and trace determination of rhodamineB and rhodamine-6G
Type JournalPaper
Keywords Mixed hemi/ad-micelle rhodamineB and rhodamine-6G
Abstract Mixed hemi/ad-micelle 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 condition (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 waste water samples.
Researchers Karolien De Wael (Fourth Researcher), Filip Kiekens (Third Researcher), Mohammad Reza Hadjmohammadi (Second Researcher), Elias ranjbar (First Researcher)