標題: Competitive adsorption of ferricyanide and ferrocyanide on gamma-Al2O3 surface
作者: Cheng, WP
Huang, C
Chien, YC
環境工程研究所
Institute of Environmental Engineering
關鍵字: competitive adsorption;complexation;ferricyanide;ferrocyanide;inner sphere;outer sphere
公開日期: 15-四月-2000
摘要: 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-Al2O3 were investigated. The results demonstrate that ferrocyanide is more competitive than ferricyanide. By comparing the derived K-app with K-int, we inferred that the adsorption of ferricyanide and ferrocyanide onto gamma-Al2O3 was achieved through outer-sphere complexation. The negative Delta H-3 indicated that the adsorption was exothermic, The positive entropy (Delta S degrees) was caused by the replacement and release of a greater number of smaller surface ions by adsorbed ferricyanide and ferrocyanide ions of larger size. (C) 2000 Academic Press.
URI: http://dx.doi.org/10.1006/jcis.1999.6684
http://hdl.handle.net/11536/30581
ISSN: 0021-9797
DOI: 10.1006/jcis.1999.6684
期刊: JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume: 224
Issue: 2
起始頁: 291
結束頁: 296
顯示於類別:期刊論文


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