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Removal of Hexacyanoferrate(II) Using Zn-Al-OAc Hydrotalcite as an Anion Exchanger

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Author(s): Roto Roto | Fitriana Nindiyasari | Iqmal Tahir

Journal: Journal of Physical Science
ISSN 1675-3402

Volume: 20;
Issue: 2;
Start page: 73;
Date: 2009;
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Keywords: hydrotalcite | acetate | anion exchange capacity | hexacyanoferrate(II)

ABSTRACT
Cyanide is a highly toxic anion and ingestion exposure can be fatal. Cyanide can be removed from water systems using Zn-Al-OAc hydrotalcite (OAc-=acetate) as an ion exchanger. A synthesis of Zn-Al-OAc hydrotalcite has been performed and it was used as an anion exchanger to reduce the concentration of cyanide in the form of [Fe(CN)6]4-. Zn-Al-OAc hydrotalcite was prepared using a stoichiometric method followed by hydrothermal treatment. The chemical composition of Zn-Al-OAc hydrotalcite was found to be Zn0.73Al0.27(OH)2(OAc)0.27.0.95H2O. The anion exchange reaction of OAc- by [Fe(CN)6]4- was fit to yield a second order reaction rate constant of k = 0.215 M-1s-1 with R2=0.996. The anion exchange capacity (AEC) was found to be 219 meq [Fe(CN)6]4-/100 g hydrotalcite. It was found that Zn-Al-Fe(CN)6 hydrotalcite could not be regenerated by OAc-.
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