Asian Journal of Research in Chemistry

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Equilibrium Studies for Hg (II) Adsorption from Aqueous Solutions by Hydrous Ferric Oxide and Tungsten Oxide


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1 Department of Chemistry, Gitam Institute of Technology, Gitam University, Visakhapatnam-530045, India
     

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Radiotracer technique has been used to study the removal behavior of Hg (II) ions from aqueous solutions by synthesized and well characterized hydrous ferric oxide (HFO) and hydrous tungsten oxide (HTO). Adsorptive concentration (10-4-10-8 mol dm-3), pH (ca 4.0-10.0) and temperature (303-333 K) were examined for assessing optimal conditions for removal of these ions. The uptake of Hg (II) ions, which fitted well for Freundlich isotherm, increased with increase in the temperature and no significant desorption took place in the studied temperature range. The presence of some anions/cations affected the uptake of metal ion markedly. Irradiation of hydrous ferric oxide and tungsten oxide by using a 11.1×109 Bq (Ra-Be) neutron source having a neutron flux of 3.9×106 cm-2 s-1 with associated γ-dose rate of 1.72 Gy/h did not influence the extent of adsorption of Hg (II) significantly.

Keywords

Hg (II), Hydrous Ferric Oxide, Tungsten Oxide, Adsorption, Freundlich Isotherm, Desorption.
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  • Equilibrium Studies for Hg (II) Adsorption from Aqueous Solutions by Hydrous Ferric Oxide and Tungsten Oxide

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Authors

Som Shankar Dubey
Department of Chemistry, Gitam Institute of Technology, Gitam University, Visakhapatnam-530045, India
Battula Sreenivasa Rao
Department of Chemistry, Gitam Institute of Technology, Gitam University, Visakhapatnam-530045, India
A. V. D. Nagendra Kumar
Department of Chemistry, Gitam Institute of Technology, Gitam University, Visakhapatnam-530045, India

Abstract


Radiotracer technique has been used to study the removal behavior of Hg (II) ions from aqueous solutions by synthesized and well characterized hydrous ferric oxide (HFO) and hydrous tungsten oxide (HTO). Adsorptive concentration (10-4-10-8 mol dm-3), pH (ca 4.0-10.0) and temperature (303-333 K) were examined for assessing optimal conditions for removal of these ions. The uptake of Hg (II) ions, which fitted well for Freundlich isotherm, increased with increase in the temperature and no significant desorption took place in the studied temperature range. The presence of some anions/cations affected the uptake of metal ion markedly. Irradiation of hydrous ferric oxide and tungsten oxide by using a 11.1×109 Bq (Ra-Be) neutron source having a neutron flux of 3.9×106 cm-2 s-1 with associated γ-dose rate of 1.72 Gy/h did not influence the extent of adsorption of Hg (II) significantly.

Keywords


Hg (II), Hydrous Ferric Oxide, Tungsten Oxide, Adsorption, Freundlich Isotherm, Desorption.