Abstract

Solid-liquid interfacial reactions between amorphous aluminosilicate and heavy metal ions, especially Zn(II), were studied by two different ways: potentiometry and spectroscopic methods. A new potentiometry was proposed and applied to reveal that Zn(II) ions form inner-sphere complex between aluminol groups on the surface of amorphous aluminosilicate. As for spectroscopic method, XAFS(X-ray Absorption Fine Structure) and Mössbauer spectroscopy were applied. These methods gave direct information about chemical states of heavy metal ions on the surface of wet solids. The combination of potentiometric and spectroscopic methods can be promising tools to study solid-liquid interfacial reactions.

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