Silica-Coated Magnetite Nanoparticles Modified with 3-Aminopropyl Groups for Solid-Phase Extraction of Pd(II) Ions from Aqueous Solutions

Here we report a simple two-step synthesis of magnetite nanoparticles (NPs) coated with silica shell functionalized with 3-aminopropyl groups. The content of surface amino groups within the range of 0.7–2.8 mmol g−1 was established by elemental analysis and acid–base titration. The materials obtained are hydrolytically stable in acidic medium and are rapidly separated from the solution using an external magnetic field. It was shown that the prepared NPs efficiently extract palladium(II) ions in the form of [PdCl4]2– from the solution. The kinetics of adsorption was well described by the second-order model with the rate constant of approximately 0.76 g mmol−1 minute−1. The isotherm of adsorption is fitted by the Langmuir model with the maximum [PdCl4]2– adsorption capacity of 0.158 mmol g−1.

[1]  G. Zeng,et al.  Adsorption of Pb(II) by iron oxide nanoparticles immobilized Phanerochaete chrysosporium: Equilibrium, kinetic, thermodynamic and mechanisms analysis , 2012 .

[2]  M. Daraio,et al.  Copper adsorption on magnetite-loaded chitosan microspheres: A kinetic and equilibrium study , 2012 .

[3]  G. Zeng,et al.  Shellac-coated iron oxide nanoparticles for removal of cadmium(II) ions from aqueous solution. , 2012, Journal of environmental sciences.

[4]  I. Melnyk,et al.  Preparation and characterization of magnetic nanoparticles with bifunctional surface layer ≡Si(CH2)3NH2/≡SiCH3 (or ≡SiC3H7−n) , 2012 .

[5]  Nguyen T. K. Thanh,et al.  Magnetic Nanoparticles : From Fabrication to Clinical Applications , 2012 .

[6]  W. Püttmann,et al.  Platinum group elements (Pt, Pd, Rh) in airborne particulate matter in rural vs. urban areas of Germany: concentrations and spatial patterns of distribution. , 2012, The Science of the total environment.

[7]  M. He,et al.  Dithizone modified magnetic nanoparticles for fast and selective solid phase extraction of trace elements in environmental and biological samples prior to their determination by ICP-OES. , 2012, Talanta.

[8]  F. Walsh,et al.  A comparison of the electrochemical recovery of palladium using a parallel flat plate flow-by reactor and a rotating cylinder electrode reactor , 2011 .

[9]  Zongshan Zhao,et al.  Effective heavy metal removal from aqueous systems by thiol functionalized magnetic mesoporous silica. , 2011, Journal of hazardous materials.

[10]  Jooyoung Song,et al.  Adsorption of heavy metal ions from aqueous solution by polyrhodanine-encapsulated magnetic nanoparticles. , 2011, Journal of colloid and interface science.

[11]  A. de Dios,et al.  Multifunctional nanoparticles: Analytical prospects , 2010, Analytica Chimica Acta.

[12]  Bin Hu,et al.  Silica-coated magnetic nanoparticles modified with γ-mercaptopropyltrimethoxysilane for fast and selective solid phase extraction of trace amounts of Cd, Cu, Hg, and Pb in environmental and biological samples prior to their determination by inductively coupled plasma mass spectrometry , 2008 .

[13]  M. R. Jamali,et al.  Application of thiophene-2-carbaldehyde-modified mesoporous silica as a new sorbent for separation and preconcentration of palladium prior to inductively coupled plasma atomic emission spectrometric determination. , 2007, Talanta.

[14]  Peng Liu,et al.  Synthesis of amidinothioureido-silica gel and its application to flame atomic absorption spectrometric determination of silver, gold and palladium with on-line preconcentration and separation , 2002 .

[15]  A. Afkhami,et al.  Simple in situ functionalizing magnetite nanoparticles by reactive blue-19 and their application to the effective removal of Pb2+ ions from water samples. , 2013, Chemosphere.

[16]  A. Khosropour,et al.  Enhancement of stability and catalytic activity of immobilized lipase on silica-coated modified magnetite nanoparticles , 2012 .