Abstract
Iron-cyanide complexes are present in soil and ground water due to anthropogenic inputs. We compared the adsorption of ferricyanide ion, on two commercial activated carbons (COM3 and COM4) and γ-alumina (A1G) in aqueous solution. Isotherm parameters obtained from batch experiments of iron-cyanide complex adsorption on these adsorbents were carried-out. The mass of the adsorbents were varied at 40 mg, 60 mg and 100 mg and the inorganic ion initial concentrations, Coalso varied between 3.04×10-4and 2.43×10-3mol/L. The equilibrium data obtained were tested by using the Langmuir and Freundlich isotherm models. These data fit well with the Langmuir and Freundlich isotherm models at this low inorganic ion initial concentration.
Highlights
Cyanide in the form of the iron-cyanide complexes i.e. ferricyanide, ([Fe(CN)6]3-) and ferrocyanide, ([Fe(CN)6]4-), are from anthropogenic sources are present in natural soil environment or drinking water[1]
The objective of this work was to investigate the adsorption of potassium ferricyanide, (K3Fe(CN)6) at very low concentrations in aqueous solution on two commercial activated carbons (COM3 and COM4) and on a γ-alumina (A1G) in batch experiments
Two important independent physicochemical aspects for the evaluation of the adsorption process are the equilibrium of adsorption and the kinetics
Summary
Cyanide in the form of the iron-cyanide complexes i.e. ferricyanide, ([Fe(CN)6]3-) and ferrocyanide, ([Fe(CN)6]4-), are from anthropogenic sources are present in natural soil environment or drinking water[1]. The iron-cyanide complexes, with iron in the oxidation states +3 and +2 respectively are very stable[7]. They are potentially hazardous because they are converted to free cyanide ion, CN-(aq) and hydrogen cyanide, HCN (g, aq.) when transported to surface water and exposed to sunlight[8]. An enzyme which is essential for the fixation of oxygen This inactivation leads to cellular asphyxiation and cellular death and to the suspension of all vital functions and subsequent death
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