JWARP  Vol.7 No.2 , January 2015
Separation of Fe3O4 Nanoparticles from Water by Sedimentation in a Gradient Magnetic Field
ABSTRACT
Sedimentation dynamics of magnetite (γ-Fe3O4) nanopowders (10 - 20 nm) in water in the presence of a gradient magnetic field was studied by optical and Nuclear Magnetic Resonance (NMR) relaxometry methods. The magnetic field B ≤ 0.3 T, dB/dz ≤ 0.13 T/cm was produced by the system of permanent strip magnets. The initial sedimentation rate of the nanoparticles in water and under magnetic fields is higher for less concentrated suspensions (c0 = 0.1 g/l) than for more concentrated ones (c0 = 1 g/l). This might be connected with the formation of gel structures due to strong magnetic attraction between ferromagnetic nanoparticles. In the gravitation field, the suspensions of the particles (10 - 20 nm) remain stable for over 20 hours. The sedimentation process can be greatly accelerated by the action of a vertical gradient magnetic field, reducing the sedimentation time down to several minutes. In a gradient magnetic field enhanced by a steel grid, sedimentation of the nanopowder (c0 = 0.1 g/l) for 180 minutes resulted in reduction of the iron concentration in water down to 0.4 mg/l. In flowing water regime, the residual iron concentration in water 0.3 mg/l is reached after 80 minutes.

Cite this paper
Medvedeva, I. , Bakhteeva, I. , Zhakov, S. , Revvo, A. , Uimin, M. , Yermakov, A. , Byzov, I. , Mysik, A. and Shchegoleva, N. (2015) Separation of Fe3O4 Nanoparticles from Water by Sedimentation in a Gradient Magnetic Field. Journal of Water Resource and Protection, 7, 111-118. doi: 10.4236/jwarp.2015.72009.
References
[1]   Tang, S.C.N. and Lo, I.M.C. (2013) Magnetic Nanoparticles: Essential Factors for Sustainable Environmental Applications. Water Research, 47, 2613-2632.
http://dx.doi.org/10.1016/j.watres.2013.02.039

[2]   Woo, K., Hong, J., Choi, S., Lee, H.-W., Ahn, J.-P., Kim, C.S. and Lee, S.W. (2004) Easy Synthesis and Magnetic Properties of Iron Oxide Nanoparticles. Chemical Materials, 16, 2814-2818.
http://dx.doi.org/10.1021/cm049552x

[3]   Song, Y., Wang, R., Rong, R., Ding, J., Liu, J., Li, R., Liu, Z., Li, H., Wang, X., Zhang, J. and Fang, J. (2011) Synthesis of Well-Dispersed Aqueous-Phase Magnetite Nanoparticles and Their Metabolism as an MRI Contrast Agent for the Reticuloendothelial System. European Journal of Inorganic Chemistry, 22, 3303-3313.
http://dx.doi.org/10.1002/ejic.201100017

[4]   Ullrich, A. and Horn, S. (2013) Structural Investigations on Differently Sized Monodisperse Iron Oxide Nanoparticles Synthesized by Remineralization of Apoferritin Molecules. Journal of Nanoparticle Research, 15, 1821.
http://dx.doi.org/10.1007/s11051-013-1821-0

[5]   Savage, N. and Diallo, M.S. (2005) Nanomaterials and Water Purification: Opportunities and Challenges. Journal of Nanoparticle Research, 7, 331-342.
http://dx.doi.org/10.1007/s11051-005-7523-5

[6]   Tiwari, D.K., Behari, J. and Sen, P. (2008) Application of Nanoparticles in Waste Water Treatment. World Applied Science Journal, 3, 417-433.

[7]   Mandel, K. and Hutter, F. (2012) The Magnetic Nanoparticle Separation Problem. Nano Today, 7, 485-487.
http://dx.doi.org/10.1016/j.nantod.2012.05.001

[8]   Medvedeva, I., Uimin, M., Yermakov, A., Mysik, A., Byzov, I., Nabokova, T., Gaviko, V., Shchegoleva, N., Zhakov, S., Tsurin, V., Linnikov, O., Rodina, I., Platonov, V. and Osipov, V. (2012) Sedimentation of Fe3O4 Nanosized Magnetic Particles in Water Solution Enhanced in a Gradient Magnetic Field. Journal of Nanoparticle Research, 14, 1-11.

[9]   Medvedeva, I., Bakhteeva, Ju., Zhakov, S., Revvo, A., Bysov, I., Uimin, M., Yermakov, A. and Mysik, A. (2013) Sedimentation and Aggregation of Magnetite Nanoparticles in Water by a Gradient Magnetic Field. Journal of Nanoparticle Research, 15, 2054.
http://dx.doi.org/10.1007/s11051-013-2054-y

[10]   Phenrat, T., Saleh, N., Sirk, K., Tilton, R.D. and Lowry, G.V. (2007) Aggregation and Sedimentation of Aqueous Nanoscale Zerovalent Iron Dispersions. Environmental Science Technology, 41, 284-290.
http://dx.doi.org/10.1021/es061349a

[11]   Goya, G.F., Bergio, T.S., Fonseca, F.C. and Morales, M.P. (2003) Static and Dynamic Magnetic Properties of Spherical Magnetite Nanoparticles. Journal of Applied Physics, 94, 3520-3528.
http://dx.doi.org/10.1063/1.1599959

[12]   Yavuz, C.T., Mayo, J.T., Yu, W.W., Prakash, A., Falkner, J.C., Yean, S., Cong, L., Shipley, H.J., Kan, A., Tomson, M., Natelson, D. and Colvin, V. (2006) Low-Field Magnetic Separation of Monodisperse Fe3O4 Nanocrystals. Science, 314, 964-967.
http://dx.doi.org/10.1126/science.1131475

[13]   Kortov, V.S., Ermakov, A.E., Zatsepin, A.F., Uimin, M.A., Nikiforov, S.V., Mysik, A.A. and Gaviko, V.S. (2008) Specific Features of Luminescence Properties of Nanostructured Aluminum Oxide. Physics of the Solid State, 50, 957-961.
http://dx.doi.org/10.1134/S1063783408050259

[14]   Mitreiter, I., Oswald, S.E. and Stallmach, F. (2010) Investigation of Iron(III)-Release in the Pore Water of Natural Sands by NMR Relaxometry. The Open Magnetic Resonance Journal, 3, 46-51.

[15]   Furst, E.M. and Gast, A.P. (2000) Dynamics and Lateral Interactions of Dipolar Chains. Physical Review E, 62, 6916-6925.
http://dx.doi.org/10.1103/PhysRevE.62.6916

[16]   Martínez-Pedrero, F., El-Harrak, A., Fernández-Toledano, J.C., Tirado-Miranda, M., Baudry, J., Schmitt, A., Bibette, J. and Callejas-Fernández, J. (2008) Kinetic Study of Coupled Field-Induced Aggregation and Sedimentation Processes Arising in Magnetic Fluids. Physical Review E, 78, Article ID: 011403.
http://dx.doi.org/10.1103/PhysRevE.78.011403

[17]   Eberbeck, D., Wiekhorst, F., Steinhoff, U. and Trahms, L. (2006) Aggregation Behaviour of Magnetic Nanoparticle Suspensions Investigated by Magnetorelaxometry. Journal of Physics Condensed Matter, 18, S2829-S2846.
http://dx.doi.org/10.1088/0953-8984/18/38/S20

[18]   Gómez-Lopera, S., Arias, J., Gallardo, V. and Delgado, A. (2006) Stability of Magnetite/Poly(Lactic Acid) Core/Shell Nanoparticles. Langmuir, 22, 2816-2821.
http://dx.doi.org/10.1021/la0530079

[19]   Berret, J-F., Sandre, O. and Mauger, A. (2007) Size Distribution of Superparamagnetic Particles Determined by Magnetic Sedimentation. Langmuir, 23, 2993-2999.
http://dx.doi.org/10.1021/la061958w

[20]   Hygienic Standards for Drinking Water in Russian Federation 2.1.4.1116-02.

 
 
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