文献类型：期刊文献

英文题名：Strategies for anti-oxidative stress and anti-acid stress in bioleaching of LiCoO2 using an acidophilic microbial consortium

作者：Liu, Dehong[1];Shi, Hongjie[1];Chen, Guanglin[1];Zhang, Xu[1];Gu, Tingyue[2];Zhu, Minglong[1];Tan, Wensong[1]

机构：[1]East China Univ Sci & Technol, State Key Lab Bioreactor Engn, Shanghai 200237, Peoples R China;[2]Ohio Univ, Dept Chem & Biomol Engn, Athens, OH 45701 USA

年份：2022

卷号：26

期号：2

外文期刊名：EXTREMOPHILES

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000818862200001)】；

基金：This work was generously supported by the National Natural Science Foundation of China (Grant No. 21878083).

语种：英文

外文关键词：Bioleaching; Acidophilic microbial consortium; Biofilm; Electrochemistry; Spermine; Oxidative stress; Acid stress

摘要：High metal ion concentrations and low pH cause severely inhibit the activity of an acidophilic microbial consortium (AMC) in bioleaching. This work investigated the effects of exogenous spermine on biofilm formation and the bioleaching efficiency of LiCoO2 by AMC in 9K medium. After the addition of 1 mM spermine, the activities of glutathione peroxidase and catalase increased, while the amount of H2O2, intracellular reactive oxygen species (ROS) and malondialdehyde in AMC decreased. These results indicated that the ability of AMC biofilm to resist oxidative stress introduced by 3.5 g/L Li+ and 30.1 g/L Co2+ was improved by spermine. The activity of glutamate decarboxylase was promoted to restore the intracellular pH buffering ability of AMC. Electrochemical measurements showed that the oxidation rate of pyrite was increased by exogenous spermine. As a result, high bioleaching efficiencies of 97.1% for Li+ and 96.1% for Co2+ from a 5.0% (w v(-1)) lithium cobalt oxide powder slurry were achieved. This work demonstrated that Tafel polarization can be used to monitor the AMC biofilm's ability of uptaking electrons from pyrite during bioleaching. The corrosion current density increased with 1 mM spermine, indicating enhanced electron uptake by the biofilm from pyrite.