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Related Experiment Videos

Vanadium removal by metal (hydr)oxide adsorbents.

A Naeem1, P Westerhoff, S Mustafa

  • 1National Centre of Excellence in Physical Chemistry, University of Peshawar, Peshawar, Pakistan. naeeem64@yahoo.com

Water Research
|February 17, 2007
PubMed
Summary
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This study evaluates vanadium removal from groundwater using three commercial metal oxide adsorbents. Iron-based GFH demonstrated the highest adsorption capacity, outperforming titanium-based GTO and another iron-based adsorbent, E-33.

Area of Science:

  • Environmental Science
  • Water Treatment Technologies
  • Adsorption Science

Background:

  • Vanadium is a contaminant of concern on the US EPA's Candidate Contaminant List #2.
  • Regulatory guidelines for vanadium are emerging, necessitating effective removal technologies.
  • Limited research exists on vanadium adsorption by commercially available adsorbents.

Purpose of the Study:

  • To assess the effectiveness of three commercial metal oxide adsorbents for vanadium removal from groundwater.
  • To investigate the adsorption kinetics and capacity of these adsorbents under varying conditions.
  • To compare vanadium removal performance with existing arsenic treatment technologies.

Main Methods:

  • Evaluated three adsorbents: GFH (iron-based), GTO (TiO2-based), and E-33 (iron-based).

Related Experiment Videos

  • Studied vanadate adsorption kinetics using the Homogenous Surface Diffusion Model (HSDM).
  • Assessed the impact of pH, vanadium concentration, and adsorbent dosage; analyzed data using Langmuir and Freundlich isotherms.

    • Main Results:

    • Vanadium adsorption decreased with increasing pH, with optimal removal at pH 3-4.
    • GFH exhibited the highest adsorption capacity, followed by GTO, then E-33.
    • Langmuir model provided a better fit than Freundlich, with GFH > GTO > E-33 for both sorption maxima (Xm) and binding energy (b).
    • Successful vanadium removal was demonstrated in column tests using Arizona groundwater.

    Conclusions:

    • Commercially available metal oxide adsorbents, particularly iron-based GFH, can effectively remove vanadium from groundwater.
    • Adsorption performance is pH-dependent and best described by the Langmuir model.
    • Existing metal oxide technologies for arsenic removal may be adapted for vanadium treatment, though effectiveness may vary.