Electrochemical kinetic study of surface layer growth on natural pyrite in acid medium
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Data
2006-01-05
Autores
Giannetti, B. F.
Almeida, CMVB
Bonilla, S. H.
Título da Revista
ISSN da Revista
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Editor
Elsevier B.V.
Resumo
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 = 0.80 V (versus SHE), and 0.80 V <= E <= 1.00 V 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. (c) 2005 Elsevier B.V. All rights reserved.
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Palavras-chave
kinetic model, pyrite, surface
Como citar
Colloids And Surfaces A-physicochemical And Engineering Aspects. Amsterdam: Elsevier Science Bv, v. 272, n. 1-2, p. 130-138, 2006.