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Abstract: Electrochemical experiments in acetic acid–acetate buffer (pH 4.5) are conducted in order to understand metallic and ionic mercury adsorption processes on the pyrite surface. The nature as well as the extent of the spontaneous interaction between pyrite and mercuric ions was evaluated. The spontaneous reduction of mercury species onto pyrite surface was confirmed. These results represent a first step for the use of mining wastes rich in pyrite for mercury pollution abatement. [Copyright &y& Elsevier]

Abstract: This paper presents electrochemical experiments on natural pyrite that combine potentiostatic and voltammetric techniques. X-ray microanalysis is used as an auxiliary technique. The layer growth on pyrite surface is conducted in a wide range of pH and potential range: 3.4≤pH≤5.9 with E =0.80V (versus SHE), and 0.80V≤ E ≤1.00V with pH 4.5 (versus SHE) in acetic acid–acetate buffer. This work is unique for two reasons: (1) phenomenological model about layer growth is applied and mathematical-physic consistence is verified and (2) Meyer''s hypotheses of chemical mechanism are used to explain kinetic parameters of the phenomenological model. [Copyright &y& Elsevier]