Oxidation study of the synthetic sulfides molybdenite (MoS2) and covellite (CuS) by Acidithiobacillus ferrooxidans using respirometric experiments

Química Nova

Francisco Junior, Wilmo E.¹  Universidade Federal de Rondônia, Porto Velho¹  Bevilaqua, Denise¹  Universidade Estadual Paulista, Araraquara, Brasil¹  Garcia Júnior, Oswaldo¹ 

关键词: sulfide oxidation;    A. ferrooxidans;    respirometric experiments.;   

DOI  :  10.1590/S0100-40422009000600022

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

This paper analyses the oxidation of covellite and molybdenite by Acidithiobacillus ferrooxidans strain LR using respirometric experiments. The results showed that both sulfides were oxidized by A. ferrooxidans, however, the covellite oxidation was much higher than molybdenite. Regarding the kinetic oxidation, the findings revealed that just molybdenite oxidation followed the classical Michaelis-Menten kinetic. It is probably associated with the pathway which these sulfides react to chemistry-bacterial attack, what is influenced by its electronic structures. Besides, experiments conducted in the presence of Fe3+ did not indicate alterations in molybdenite oxidation. Thus, ferric ions seem not to be essential to the sulfide oxidations.

【 授权许可】

Unknown