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Synthesis of zero valent iron nanoparticles and application to removal of arsenic(III) and arsenic(V) from water

Mandal, Badal Kumar and Kumar, Kesarla Mohan and Vankayala, Raviraj and Mukherjee, Amitava and Kumar, Koppala Siva and Reddy, Pamanji Sreedhara and Hegde, MS and Sreedhar, Bojja (2012) Synthesis of zero valent iron nanoparticles and application to removal of arsenic(III) and arsenic(V) from water. In: JOURNAL OF THE INDIAN CHEMICAL SOCIETY, 89 (9). pp. 1215-1221.

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Recently nano scale zero valent iron particles (nZVI) have been considered as smart adsorbent for environmental and groundwater remediation. Although several synthetic methods are available for the preparation of nZVI, air stable nZVI are not available for remediation works. Further, challenges demand synthesis of nZVI without stabilizers and capping agents. A modified methodology for the synthesis of air stable nZVI has been developed without any capping agents and characterized by powder X-Ray Diffraction (XRD), Scanning Electron Microscopy Energy-dispersive X-Ray (SEM-EDS), Transmission Electron Microscopy (TEM) and X-Ray Photoelectron Spectroscopy (XPS). The results of the present study suggest that the synthetic nZVI are air-stable over a period of one year and consists of particles of 30-40 nm in diameter. Although a layer of less than 3 am thick oxide/hydroxide is observed by TEM and XPS, it appears to be due to oxidation of outer surface during analysis. Adsorption study has shown that the synthetic nZVI are more effective adsorbent than the commercial nZVI and can remove simultaneously arsenite As-III] and arsenate As-V] from water without prior reduction of As-V to As-III. The removal process is adsorptive rather than precipitative and the removal of As-III is greater than that of As-V.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to SCIENTIFIC PUBL-INDIA, JODHPUR, INDIA
Keywords: Synthetic nZVI;powder XRD;TEM;XPS;SEM-EDS;adsorption;removal;As-III;As-V
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 14 Feb 2013 10:55
Last Modified: 07 Mar 2013 05:37
URI: http://eprints.iisc.ac.in/id/eprint/45796

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