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Related Experiment Videos

Arsenate removal from aqueous solutions using modified red mud.

Shuwu Zhang1, Changjun Liu, Zhaokun Luan

  • 1State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, Beijing 100085, PR China. zhangshuwu@126.com

Journal of Hazardous Materials
|September 11, 2007
PubMed
Summary
This summary is machine-generated.

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Modified red mud effectively removes arsenate from water. This iron(III) chloride-treated waste material shows high adsorption capacity, especially at lower pH, and can be regenerated for reuse.

Area of Science:

  • Environmental Chemistry
  • Materials Science
  • Water Treatment

Background:

  • Red mud (RM) is a significant waste byproduct of alumina production.
  • Arsenate contamination in water poses serious environmental and health risks.
  • Effective and economical methods for arsenate removal are crucial.

Purpose of the Study:

  • To investigate the efficacy of iron(III) chloride-modified red mud (MRM) for arsenate removal from aqueous solutions.
  • To characterize the modified material and understand the adsorption mechanism.
  • To evaluate the influence of operational parameters and coexisting ions on adsorption performance.

Main Methods:

  • Red mud was modified with FeCl(3).
  • Characterization of RM and MRM using SEM and XRD.

Related Experiment Videos

  • Batch adsorption experiments were conducted to study the effects of time, pH, and coexisting ions.
  • Adsorption isotherms were analyzed using Langmuir and Freundlich models.

    • Main Results:

    • Adsorption equilibrium was reached within 24 hours.
    • Arsenate adsorption capacity increased significantly with decreasing pH.
    • The maximum adsorption capacity of MRM was 68.5 mg/g at pH 6.
    • The Langmuir isotherm model provided the best fit for the experimental data.
    • Ca(2+) enhanced adsorption, while HCO(3)(-) inhibited it; NO(3)(-) had minimal effect.
    • MRM exhibited high regeneration efficiency (92.1%) using 0.2 mol/L NaOH.

    Conclusions:

    • FeCl(3)-modified red mud is a promising adsorbent for arsenate removal from water.
    • Adsorption is highly pH-dependent, favoring acidic conditions.
    • The adsorbent demonstrates good reusability, making it a potentially sustainable solution.