Equilibria of adsorption of zinc ions on manganese dioxide.
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- NAKAI Tohru
- Analytical Chemistry Laboratory, Faculty of Engineering, Hokkaido University
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- KATAYAMA Noriaki
- 旭川工業高等専門学校
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- NAGAYAMA Masaichi
- 日本ケミコン株式会社
Bibliographic Information
- Other Title
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- 二酸化マンガンに対する亜鉛イオンの吸着平衡
- 2サンカ マンガン ニ タイスル アエン イオン ノ キュウチャク ヘイコウ
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Description
The behavior of adsorption of Zn2+ ions on Mn02 was investigated to establish the stoichiometry and the equilibrium conditions of the reaction. The concentrations of Zn2+ ions in solution were determined by AAS, and the amount of Zn2+ ions adsorbed was obtained from the difference between the concentrations before and after the adsorption. The surface concentration of adsorbed Zn2+ ions, Γ, increased with increasing pH and the concentration of Zn2+ ions in solution, [Zn2+].The adsorption is considered to occur by exchanging n protons in the acid hydroxyl groups on the surface of MnO2, ≡MnOHa, with a Zn2+ ion: <BR>Zn2++(2-n)NO3-+n≡MnOHa_??_(≡MnO)nZn(2-n)+·(NO3-)2-n+nH+<BR>……(1)<BR>The reaction product is a surface complex with a charge of 2-n, to which NO3- ions are adsorbed as counter anions. The equilibrium condition of this reaction is given by<BR>βn=Γ[H+]n/[Zn2+][NO3-]2-n[≡MnOHa]nexp(BΓ)<BR>……(2)<BR>where βn is the equilibrium constant and B is a constant. The exponential term expresses the retardation of adsorption by the adsorbed Zn2+ ions. By multiparametric curve-fitting, the values of βn, B, and n were determined to be: βn, =3.45×10-3 mol-0.79 m2.2, B=1.83×106 mol-1 m2, and n=1.21 for an ionic strength of 0.1(NaNO3) and at 25°C. Γ calculations from eq. (2) agreed well with the measured Γ over wide ranges of [Zn2+] and [H+].
Journal
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- BUNSEKI KAGAKU
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BUNSEKI KAGAKU 35 (12), 966-971, 1986
The Japan Society for Analytical Chemistry
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Details 詳細情報について
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- CRID
- 1390001204051693696
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- NII Article ID
- 110002909272
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- NII Book ID
- AN00222633
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- NDL BIB ID
- 3106473
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- ISSN
- 05251931
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- NDL-Digital
- CiNii Articles
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- Abstract License Flag
- Disallowed