• H Vijayanand

      Articles written in Bulletin of Materials Science

    • Uses of 𝛼-Fe2O3 and fly ash as solid adsorbents

      J Shakhapure H Vijayanand S Basavaraja V Hiremath A Venkataraman

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      Solid adsorbents have shown great promise for control of particulate and non-particulate matter and as gas sensing devices in recent times. In the present study, adsorption of environmental toxic pollutant such as lead ions on solid adsorbents viz. 𝛼-Fe2O3 and fly ash, are reported. Considerable adsorption was observed on fly ash when compared to 𝛼-Fe2O3 surface. These studies are characterized by employing solid state and solution studies.

    • Lead adsorption study on combustion derived 𝛾-Fe2O3 surface

      Arunkumar Lagashetty H Vijayanand S Basavaraja N N Mallikarjuna A Venkataraman

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      New combustion synthetic route for the synthesis of nanosized 𝛾-Fe2O3 by microwave-assisted route is reported. X-ray density, tap density and powder density of prepared 𝛾-Fe2O3 are calculated. Adsorption study of Pb2+ on combustion derived nanosized 𝛾-Fe2O3 is studied by dynamic method. The 𝛾-Fe2O3 structure and lead adsorbed 𝛾-Fe2O3 (Pb-𝛾-Fe2O3) are studied by X-ray diffraction (XRD). Additional lead peaks in Pb-𝛾-Fe2O3 sample pattern confirm the lead adsorption. Morphology of as prepared 𝛾-Fe2O3 and Pb-𝛾-Fe2O3 is studied by scanning electron micrograph (SEM) technique. Varied morphology for Pb-𝛾-Fe2O3 compared to its 𝛾-Fe2O3 is observed. Variation of bonding in Pb-𝛾-Fe2O3 sample due to lead adsorption is viewed by infrared spectroscopic (IR) technique. Energy dispersive X-ray microanalysis (EDX) is scanned for the lead adsorbed 𝛾-Fe2O3 to know the presence of lead on 𝛾-Fe2O3 surface. The eluent lead solution is characterized by atomic absorption spectroscopy (AAS) and solution conductivity (SC). Reduction in the concentration and increase in conductance of eluent lead solution is observed. The potential use of solid adsorbents for the adsorption of heavy metal pollutants is envisaged in the present work.

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