Competitive adsorption of ferricyanide and ferrocyanide on {gamma}-Al{sub 2}O{sub 3} surface
Journal Article
·
· Journal of Colloid and Interface Science
In the past 3 decades, research has proven the significance of competitive adsorption in the equilibrium of pollutants between solid and liquid phases. However, studies on the competitive adsorption of complex ions are very limited in spite of its important role in transporting pollutants in the natural environment. The objective of this study is to derive the thermodynamic parameters of the competitive adsorption between ferricyanide and ferrocyanide from the modified Langmuir isotherm and the triple-layer model (TLM) to determine the location of adsorption. The effects of pH, temperature, and ion concentration on competitive adsorption onto {gamma}-Al{sub 2}O{sub 3} were investigated. The results demonstrate that ferrocyanide is more competitive than ferricyanide. By comparing the derived K{sup app} with K{sup int}, the authors inferred that the adsorption of ferricyanide and ferrocyanide onto {gamma}-Al{sub 2}O{sub 3} was achieved through outer-sphere complexation. The negative {Delta}H{degree} indicated that the adsorption was exothermic. The positive entropy ({Delta}S{degree}) was caused by the replacement and release of a greater number of smaller surface ions by adsorbed ferricyanide and ferrocyanide ions of larger size.
- Research Organization:
- National Lien-Ho Inst. of Tech., Miaoli (TW)
- OSTI ID:
- 20075567
- Journal Information:
- Journal of Colloid and Interface Science, Journal Name: Journal of Colloid and Interface Science Journal Issue: 2 Vol. 224; ISSN 0021-9797; ISSN JCISA5
- Country of Publication:
- United States
- Language:
- English
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