二酸化マンガンに対する亜鉛イオンの吸着平衡

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タイトル別名
  • Equilibria of adsorption of zinc ions on manganese dioxide.
  • 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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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+].

収録刊行物

  • 分析化学

    分析化学 35 (12), 966-971, 1986

    公益社団法人 日本分析化学会

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