Article thumbnail

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

By Badal Kumar Mandal, Kesarla Mohan Kumar, Raviraj Vankayala, Amitava Mukherjee, Koppala Siva Kumar, Pamanji Sreedhara Reddy, MS Hegde and Bojja Sreedhar

Abstract

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

Topics: Solid State & Structural Chemistry Unit
Publisher: SCIENTIFIC PUBL-INDIA
Year: 2012
OAI identifier: oai:eprints.iisc.ac.in:45796
Download PDF:
Sorry, we are unable to provide the full text but you may find it at the following location(s):
  • http://eprints.iisc.ac.in/4579... (external link)
  • Suggested articles


    To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.