Adsorption of polyprotic acid at the water/air interface: Effect of counter ion and pH on surface activity of FeIII-EDTA complex

Masumi Villeneuve; Mihoko Tanaka; Mayuko Abe; Hiroyasu Sakamoto; Yoshiteru Hayami

doi:10.1007/s00396-014-3203-2

Adsorption of polyprotic acid at the water/air interface: Effect of counter ion and pH on surface activity of Fe^III-EDTA complex

Masumi Villeneuve, Mihoko Tanaka, Mayuko Abe, Hiroyasu Sakamoto, Yoshiteru Hayami

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

A rigorous thermodynamic treatment appropriate for surface adsorption from mixed aqueous solution of alkali and polyprotic acid was derived. Those equations were applied to mixed aqueous solution/air systems of alkali metal hydroxide and Fe^III complex with ethylenediamine- N, N, N′,N′-tetraacetate (Fe-EDTA). Surface density of each species arising from Fe-EDTA was separately evaluated, and thus, surface activity of Fe-EDTA was studied, especially its dependence on pH and how it is influenced by the counter cations. Fe-EDTA was positively adsorbed at the water/air interface at very low pHs and negatively at high pHs. The pH range of positive adsorption of Fe-EDTA with potassium ion, as a counter ion, was wider than that with sodium ion. Thus, potassium ion, a structure breaker, tended to smooth surface adsorption of Fe-EDTA at the water/air interface, whereas sodium ion, a structure maker, tended to withdraw Fe-EDTA from the interfacial region.

Original language	English
Pages (from-to)	2335-2348
Number of pages	14
Journal	Colloid and Polymer Science
Volume	292
Issue number	9
DOIs	https://doi.org/10.1007/s00396-014-3203-2
Publication status	Published - Sept 2014

All Science Journal Classification (ASJC) codes

Physical and Theoretical Chemistry
Polymers and Plastics
Colloid and Surface Chemistry
Materials Chemistry

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title = "Adsorption of polyprotic acid at the water/air interface: Effect of counter ion and pH on surface activity of FeIII-EDTA complex",

abstract = "A rigorous thermodynamic treatment appropriate for surface adsorption from mixed aqueous solution of alkali and polyprotic acid was derived. Those equations were applied to mixed aqueous solution/air systems of alkali metal hydroxide and FeIII complex with ethylenediamine- N, N, N′,N′-tetraacetate (Fe-EDTA). Surface density of each species arising from Fe-EDTA was separately evaluated, and thus, surface activity of Fe-EDTA was studied, especially its dependence on pH and how it is influenced by the counter cations. Fe-EDTA was positively adsorbed at the water/air interface at very low pHs and negatively at high pHs. The pH range of positive adsorption of Fe-EDTA with potassium ion, as a counter ion, was wider than that with sodium ion. Thus, potassium ion, a structure breaker, tended to smooth surface adsorption of Fe-EDTA at the water/air interface, whereas sodium ion, a structure maker, tended to withdraw Fe-EDTA from the interfacial region.",

author = "Masumi Villeneuve and Mihoko Tanaka and Mayuko Abe and Hiroyasu Sakamoto and Yoshiteru Hayami",

year = "2014",

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T1 - Adsorption of polyprotic acid at the water/air interface

T2 - Effect of counter ion and pH on surface activity of FeIII-EDTA complex

AU - Villeneuve, Masumi

AU - Tanaka, Mihoko

AU - Abe, Mayuko

AU - Sakamoto, Hiroyasu

AU - Hayami, Yoshiteru

PY - 2014/9

Y1 - 2014/9

N2 - A rigorous thermodynamic treatment appropriate for surface adsorption from mixed aqueous solution of alkali and polyprotic acid was derived. Those equations were applied to mixed aqueous solution/air systems of alkali metal hydroxide and FeIII complex with ethylenediamine- N, N, N′,N′-tetraacetate (Fe-EDTA). Surface density of each species arising from Fe-EDTA was separately evaluated, and thus, surface activity of Fe-EDTA was studied, especially its dependence on pH and how it is influenced by the counter cations. Fe-EDTA was positively adsorbed at the water/air interface at very low pHs and negatively at high pHs. The pH range of positive adsorption of Fe-EDTA with potassium ion, as a counter ion, was wider than that with sodium ion. Thus, potassium ion, a structure breaker, tended to smooth surface adsorption of Fe-EDTA at the water/air interface, whereas sodium ion, a structure maker, tended to withdraw Fe-EDTA from the interfacial region.

AB - A rigorous thermodynamic treatment appropriate for surface adsorption from mixed aqueous solution of alkali and polyprotic acid was derived. Those equations were applied to mixed aqueous solution/air systems of alkali metal hydroxide and FeIII complex with ethylenediamine- N, N, N′,N′-tetraacetate (Fe-EDTA). Surface density of each species arising from Fe-EDTA was separately evaluated, and thus, surface activity of Fe-EDTA was studied, especially its dependence on pH and how it is influenced by the counter cations. Fe-EDTA was positively adsorbed at the water/air interface at very low pHs and negatively at high pHs. The pH range of positive adsorption of Fe-EDTA with potassium ion, as a counter ion, was wider than that with sodium ion. Thus, potassium ion, a structure breaker, tended to smooth surface adsorption of Fe-EDTA at the water/air interface, whereas sodium ion, a structure maker, tended to withdraw Fe-EDTA from the interfacial region.

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Adsorption of polyprotic acid at the water/air interface: Effect of counter ion and pH on surface activity of Fe^III-EDTA complex

Abstract

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