Removal of Heavy Metal Ions by Ferrihydrite: an Opportunity to the Treatment of Acid Mine Drainage

Ferrihydrite is often an initial precipitate resulting from the neutralization of Fe(III) solution, and it seems to be one of the products of acid mine drainage forming reactions. Since having the adsorption properties, ferrihydrite can be effective for the remediation of acid mine drainage. This st...

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Bibliographic Details
Published in:Water, air, and soil pollution air, and soil pollution, 2016-06, Vol.227 (6), p.1, Article 193
Main Author: Karapinar, Nuray
Format: Article
Language:English
Subjects:
Acid mine drainage
Adsorption
Atmospheric Protection/Air Quality Control/Air Pollution
Backup software
Caustic soda
Climate Change/Climate Change Impacts
Earth and Environmental Science
Environment
Environmental monitoring
Heavy metals
Hydrogeology
Hydrolysis
Hydroxides
Iron
Iron oxides
Metal concentrations
Metal ions
Minerals
Morphology
Neutralization
Nitrates
Oxidation
Soil Science & Conservation
Sorption
Water Quality/Water Pollution
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Summary:Ferrihydrite is often an initial precipitate resulting from the neutralization of Fe(III) solution, and it seems to be one of the products of acid mine drainage forming reactions. Since having the adsorption properties, ferrihydrite can be effective for the remediation of acid mine drainage. This study prepared fresh ferrihydrite by the rapid hydrolysis of Fe(III) ions and investigates its adsorptive behaviours toward Pb(II), Cu(II), and Zn(II). When the sorption data were presented in plot of percent sorbed versus pH, it was found that sorption is strongly dependent on the solution pH and increasing as expected at higher pH for all metal ions investigated. All the observed metal cation sorption began at pH values below zero point charge (ZPC) of ferrihydrite (pH = 7.8–8.0), and almost all removal are achieved at pH values lower than that related metal hydroxide obtained. Enhanced removal of metal ions, as the pH of the solution and initial metal ion concentration are increased, was attributed to surface precipitation of metal hydroxide. The existence of ferrihydrite and adsorption of metal ions onto surfaces are favouring surface precipitation of metal ions at lower pH values than that for metal ion only. Depending on the pH of the solution and initial metal ion concentration, more than one mechanism such as adsorption by complexation and surface precipitation was responsible for the removal.
ISSN:0049-6979
1573-2932
DOI:10.1007/s11270-016-2899-7