Mohammad Vahidifar; Zarrin Eshaghi; Ramin Rezaee
Abstract
In this paper, a new rapid and sensitive method based on sodium dodecyl sulfate modified Fe3O4@α–Linolenic acid nanocomposite combined with high-performance liquid chromatography-photo diode array detection (HPLC–PDA) has been proposed for the extraction and determination of tramadol ...
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In this paper, a new rapid and sensitive method based on sodium dodecyl sulfate modified Fe3O4@α–Linolenic acid nanocomposite combined with high-performance liquid chromatography-photo diode array detection (HPLC–PDA) has been proposed for the extraction and determination of tramadol (TRA) in water samples. The Fe3O4@α–Linolenic acid NPs were synthesized and then characterized by Fourier transform-infrared spectroscopy (FT−IR), scanning electron microscopy (SEM) and X-ray diffraction (XRD). The main factors influencing extraction and desorption efficiency were optimized. Under optimum conditions, the method was successfully applied to the determination of TRA in the environmental samples and good linearity in the range of 0.1–500ng.mL-1(𝑅2> 0.99) obtained. The detection limit (LOD) and relative standard deviation (RSD) were0.074ng.mL-1 and 2.89 %( n=5) respectively. Finally, the proposed method was successfully applied with the relative recoveries percentages from 94–103.97% for the extraction and determination of tramadol in aqueous samples.
Sedigheh Kamran
Volume 4, Issue 2 , September 2017, , Pages 22-32
Abstract
Fe3O4 magnetic nanoparticles modified with alizarin red S (ARS-Fe3O4) were used for the removal of several metal ions from aqueous solution. The mean size and the surface morphology of the nanoparticles were characterized by TEM, XRD and FTIR techniques. Adsorption studies of mentioned metal ions were ...
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Fe3O4 magnetic nanoparticles modified with alizarin red S (ARS-Fe3O4) were used for the removal of several metal ions from aqueous solution. The mean size and the surface morphology of the nanoparticles were characterized by TEM, XRD and FTIR techniques. Adsorption studies of mentioned metal ions were performed in batch system. The adsorption of metal ions onto ARS-Fe3O4nanoparticles was affected by the several analytical parameters such as an initial pH, metal ions concentration, adsorbent amount, contact time and temperature. Experimental results indicated that ARS-Fe3O4 nanoparticles were quantitatively removed. The maximum adsorption capacities ofARS-Fe3O4 for the Langmuir model were 50.0, 22.7 and 21.7 mg of metal ions per gram of nanoparticle for Zn2+,Cu2+and Pb2+, respectively. The isotherm evaluations revealed that the Langmuir model attained better fits to the equilibrium data than the othermodels. The kinetic data of adsorption of Zn2+,Cu2+and Pb2+ ions on the synthesized adsorbents were best described by pseudo-second-order equation. The adsorption processesfor three metal ions were endothermic. Metal ions were desorbed from nanoparticles by 2 mLHCl solution 0.1 mol L−1.
Sedigheh Kamran
Volume 3, Issue 2 , September 2016, , Pages 105-115
Abstract
Fe3O4 nanoparticles and their binary mixtures ([C8MIM]-Fe3O4) with 1-Octyl-3-methylimidazolium bromide were prepared and characterized as ionic liquid for using in the adsorption of phenylalanine, tryptophan, and tyrosine. The characteristics of [C8MIM]-Fe3O4 nanoparticles were investigated via ...
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Fe3O4 nanoparticles and their binary mixtures ([C8MIM]-Fe3O4) with 1-Octyl-3-methylimidazolium bromide were prepared and characterized as ionic liquid for using in the adsorption of phenylalanine, tryptophan, and tyrosine. The characteristics of [C8MIM]-Fe3O4 nanoparticles were investigated via using TEM, XRD and FTIR techniques. The pH of the point of zero charge (pHpzc) of both Fe3O4 and [C8MIM]-Fe3O4 were obtained based on the experimental curves corresponding to the immersion technique. Experimental results were obtained under optimum operational conditions of: nanoparticle amount of 0.015 g and a contact times of 5, 10, 15 minutes for tryptophan (Trp), tyrosine (Tyr) and phenylalanine (Phe), respectively, when initial concentration of each amino acid was 5.0×10−4 mol L−1. The isotherm evaluations revealed that the Freundlich model attained better fits to the equilibrium data than the Dubinin-Radushkevich model. The maximum obtained adsorption capacities of Tyr, Trp and Phe were 12.74, 3.55 and 35.62 mg amino acid per gram of adsorbent, respectively. The applicability of pseudo-first order and pseudo-second order kinetic models was estimated on the basis of comparative analysis of the corresponding rate parameters, equilibrium adsorption capacity and correlation coefficients. Furthermore, the adsorption processes were found endothermic. Both phenylalanine and tyrosine were desorbed from [C8MIM]-Fe3O4 nanoparticles by using NaOH aqueous solution with concentrations of 1.0 and 2.0 mol L−1, respectively. Tryptophan was completely desorbed in the presence of a mixture of 1.0 mol L−1 NaCl and 1.0 mol L−1 NaOH. The nanoparticles thus were recycled.
Sedigheh Kamran; Hossein Tavallali; Ali Azad
Volume 1, Issue 2 , September 2014, , Pages 78-86
Abstract
Fe3O4 magnetic nanoparticles modified with 1-Octyl-3-methylimidazolium bromide([C8MIM]-Fe3O4) were used for the removal of reactive red 141 (RR141) and reactive yellow 81 (RY81) as model azo dyes from aqueous solution. The mean size and the surface morphology of the nanoparticles were characterized by ...
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Fe3O4 magnetic nanoparticles modified with 1-Octyl-3-methylimidazolium bromide([C8MIM]-Fe3O4) were used for the removal of reactive red 141 (RR141) and reactive yellow 81 (RY81) as model azo dyes from aqueous solution. The mean size and the surface morphology of the nanoparticles were characterized by TEM, XRD and FTIR techniques. Adsorption studies of two dyes were performed under different experimental conditions in batch technique. The adsorption of dyes onto [C8MIM]-Fe3O4 nanoparticles was affected by the initial pH, dye concentration, adsorbent amount, contact time and temperature. Experimental results indicated that [C8MIM]-Fe3O4 nanoparticles removed more than 98%. The maximum adsorption capacity of [C8MIM]-Fe3O4 for the Langmuir model was 71.4 mg g−1 and 62.5 mg g−1 for RR141 and RY81, respectively. The isotherm evaluations revealed that the Langmuir model attained better fits to the equilibrium data than the Freundlich model. Adsorption processes onto [C8MIM]-Fe3O4 nanoparticles were spontaneous exothermic and endothermic for RY81 and RR141, respectively. Dyes were desorbed from nanoparticlesby NaCl solution 0.1 mol L−1 at 80 and 30 °C for RR141 and RY81, respectively.
