International Journal of Environmental Sciences

Volume 5 Issue 2 2014- September 2014    Pages: 260-269  <<Previous    Next>>

Synthesis and characterisation of modified magnetite super paramagnetic nano composite for removal of toxic metals from ground water

Author Information:

Nikhat Neyaz, Mohd Sadiq S. Zarger, Weqar A Siddiqui
Department of Applied Sciences and Humanities, Faculty of engineering & Technology Jamia Millia islamia, New Delhi.


In this study a novel type of EDTA- Surface functionalized Si-coated magnetite nano particles were synthesized. Being hexadentate ligand EDTA (ethylene-di-ammine tetra acetic acid) has a higher rate of chelation or complication with toxic metals thus enhancing the removal efficiency of nanosorbents. Magnetite nanoparticles (Fe3O4) were synthesized by a simple chemical co-precipitation route and silica-coating on its surface was done by hydrolysis of tetraethoxy silane (TEOS).EDTA was functionalised on the surface of Si-coated magnetite nanoparticles in acidic medium (PH=4-4.6) through a complex reaction mechanism. The resultant nanosorbents were well dispersed in water. Their surface morphology was studied by SEM which also showed nanoparticles had the mean diameter 12-13nm. XRD result showed the prominent peak of Fe3O4 at 2Ө=350.and its cubic spinel structure.

FT-IR spectra revealed that fictionalization of ethylene-diammine tetra acetic acid on the surface of Si-coated Fe3o4 was successfully done as characteristics peak- of –COOH was depicted clearly. The chemical composition were determined by EDX and the relative ratio of O, Fe, Si and C elements clearly indicated the successful preparation of surface functionalized magnetite nano particles. Their magnetic property was determined by VSM and result showed that the nano particles were super paramagnetic and inert silica coating and fictionalization did not reduce the magnetic property markedly. Finally it was tested with .1M standard CuSO4 solution for the adsorption of copper and found that only .11 gram nonabsorbent was able to adsorb copper up to 66% from the solution in less than 15 minutes. Result was obtained by optimizing PH-(6) and at room temperature.

Keywords: Magnetite, EDTA, Nanosorbent, SEM, EDX


© 2014 Copyright by the authors, licensee Integrated Publishing Association.This is an open access article distributed under the Creative Commons Attribution License (3.0) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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