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

Quimica nova

Bevilaqua, Denise¹  Garcia Júnior, Oswaldo¹  Francisco Junior, Wilmo E.² 

[1] Universidade Estadual Paulista, Araraquara, Brasil;Universidade Federal de Rondônia, Porto Velho

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 analysesthe oxidation of covellite and molybdenite by Acidithiobacillus ferrooxidansstrain LR using respirometric experiments. The results showed that both sulfideswere oxidized by A. ferrooxidans, however, the covellite oxidation wasmuch higher than molybdenite. Regarding the kinetic oxidation, the findingsrevealed that just molybdenite oxidation followed the classical Michaelis-Mentenkinetic. It is probably associated with the pathway which these sulfides reactto chemistry-bacterial attack, what is influenced by its electronic structures.Besides, experiments conducted in the presence of Fe3+ did not indicatealterations in molybdenite oxidation. Thus, ferric ions seem not to be essentialto the sulfide oxidations.

【 授权许可】

CC BY