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

Wang Xiulin; Zhang Zhengbin; Liu Liansheng

doi:10.1007/BF02846504

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

Updated：2023-05-16

- The surface reaction on liquid-solid interface of “amino acid-Cu(II)−MnO2” system in seawater
- Journal of Oceanology and Limnology Vol. 6, Issue 3, Pages: 258-271(1988)
- Affiliations：
  
  Shangdong College of Oceanology
- Author bio：
- Funds：
- DOI：10.1007/BF02846504
  CLC：
- Published：1988
- Accepted：
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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
DOI：

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 DOI：

摘要

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

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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references

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