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The surface reaction on liquid-solid interface of “amino acid-Cu(II)−MnO2” system in seawater

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Abstract

The results obtained from the Cu(II)%-pH curve of the system in the presence of added amino acid indicated that the added amino acids of higher concentration can inhibit the Cu(II)-σ-MnO2 ion exchange and that their inhibiting effects decrease in the following sequence when the initial amino acid concentrations are 20.00 ppm: histidine > cystine > glutamic acid > proline > alanine > glycine. The determination of amino acid in solution performed with an amino acid analyser showed that added amino acids react chemically on the surface of the σ-MnO2 According to thermodynamic equilibria relations in the system, amino acids can be changed to amines because of their decarboxylation on the surface of the σ-MnO2. Considering (1) the effect-inhibiting factor of amine FA(β, Ka, pH) representing the complex potential of amine with Cu(II) in solution and (2) the acidic constant of −NH +3 group in the amine molecule representing the ability of cation exchange of the amine with σ-MnO2, the inhibiting seqence of added amino acid of 20.00 ppm (Eq.(1)) is reasonable. Thus added amino acids do inhibit Cu(II)-σ-MnO2 ion exchange because (1) the amino acid and/ or amine, which is the decarboxylate of the corresponding amino acid, complex with Cu(II) in solution and compete with σ-MnO2 for Cu(II); (2) the cation exchange of the amino acid and/or amine reduce the exchange site on the surface of the σ-MnO2. The results obtained from the isotherms indicated that the theory of interfacial stepwise ion exchange can be extended to the Cu(II) σ-MnO2 ion exchange system in the presence of added amino acid.

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Authors and Affiliations

  1. Shangdong College of Oceanology, Shangdong, USA

    Wang Xiulin, Zhang Zhengbin & Liu Liansheng

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  1. Wang Xiulin
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  2. Zhang Zhengbin
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  3. Liu Liansheng
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Xiulin, W., Zhengbin, Z. & Liansheng, L. The surface reaction on liquid-solid interface of “amino acid-Cu(II)−MnO2” system in seawater. Chin. J. Ocean. Limnol. 6, 258–271 (1988). https://doi.org/10.1007/BF02846504

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  • DOI: https://doi.org/10.1007/BF02846504

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