Adsorption characteristics of iron-cyanide complex on {gamma}-Al{sub 2}O{sub 3}

Journal Article · Sat Aug 10 04:00:00 EDT 1996 · Journal of Colloid and Interface Science

DOI:https://doi.org/10.1006/jcis.1996.0420· OSTI ID:367910

Cheng, W P; Huang, C ^[1]

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1. National Chiao Tung Univ., Hsinchu (Taiwan, Province of China). Inst. of Environmental Engineering

The adsorption behavior of ferrocyanide and ferricyanide toward aluminum oxide with a 0.01 M NaClO{sub 4} background electrolyte at 25 C was investigated. Results obtained from different pH values demonstrated that the adsorption of these complex ions could be described by a modified Langmuir isotherm in the concentration range 0.5 {times} 10{sup {minus}4} to 4 {times} 10{sup {minus}4} M. This modified Langmuir isotherm developed here could accurately predict the equilibrium partition between solid and liquid phases while taking proton competition into account. Also, the apparent equilibrium constant (K{sup app}) derived from the Langmuir equation for ferrocyanide or ferricyanide adsorption on aluminum oxide was compared with the intrinsic constant (K{sup int}) calculated by triple-layer model simulation. This comparison revealed a strong correlation between the apparent equilibrium constant and the intrinsic constant. Moreover, in comparing K{sup app} with K{sup int}, one can infer that the adsorption of either ferrocyanide or ferricyanide complexes onto aluminum oxide is achieved through outer-sphere complexation.

• OSTI ID: 367910
• Journal Information: Journal of Colloid and Interface Science, Journal Name: Journal of Colloid and Interface Science Journal Issue: 2 Vol. 181; ISSN 0021-9797; ISSN JCISA5
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
ADSORPTION
ALUMINIUM OXIDES
CONCENTRATION RATIO
FERRICYANIDES
FERROCYANIDES
INDUSTRIAL WASTES
MATHEMATICAL MODELS
SORPTIVE PROPERTIES
TOXIC MATERIALS