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Synthesis of zero valent iron nanoparticles and application to removal of arsenic(III) and arsenic(V) from water
B.K. Mandal, K.M. Kumar, , A. Mukherjee, K.S. Kumar, P.S. Reddy, M.S. Hegde, B. Sreedhar
Published in Indian Chemical Society
Volume: 89
Issue: 9
Pages: 1215 - 1221
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 nm 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 [AsIII] and arsenate [AsV] from water without prior reduction of AsV to AsIII. The removal process is adsorptive rather than precipitative and the removal of AsIII is greater than that of AsV.
About the journal
JournalJournal of the Indian Chemical Society
PublisherIndian Chemical Society