Solid-liquid Interfacial Reactions Between Clay Minerals and Heavy Metal Ions.

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 alumi- nosilicate. As for spectroscopic method, XAFS(X-ray Absorption Fine Structure) and Mossbauer 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.