首页|Different fates of Sb(Ⅲ)and Sb(Ⅴ)during the formation of jarosite mediated by Acidithiobacillus ferrooxidans
Different fates of Sb(Ⅲ)and Sb(Ⅴ)during the formation of jarosite mediated by Acidithiobacillus ferrooxidans
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Different fates of Sb(Ⅲ)and Sb(Ⅴ)during the formation of jarosite mediated by Acidithiobacillus ferrooxidans
Secondary iron-sulfate minerals such as jarosite,which are easily formed in acid mine drainage,play an important role in controlling metal mobility.In this work,the typical iron-oxidizing bacterium Acidithiobacillus ferrooxidans ATCC 23270 was selected to synthe-size jarosite in the presence of antimony ions,during which the solution behavior,synthetic product composition,and bacterial metabolism were studied.The results show that in the presence of Sb(Ⅴ),Fe2+was rapidly oxidized to Fe3+by A.ferrooxidans and Sb(Ⅴ)had no obvi-ous effect on the biooxidation of Fe2+under the current experimental conditions.The pres-ence of Sb(Ⅲ)inhibited bacterial growth and Fe2+oxidation.For the group with Sb(Ⅲ),prod-ucts with amorphous phases were formed 72 hr later,which were mainly ferrous sulfate and pentavalent antimony oxide,and the amorphous precursor was finally transformed into a more stable crystal phase.For the group with Sb(Ⅴ),the morphology and structure of jarosite were changed in comparison with those without Sb.The biomineralization process was ac-companied by the removal of 94％Sb(Ⅴ)to form jarosite containing the Fe-Sb-O complex.Comparative transcriptome analysis shows differential effects of Sb(Ⅲ)and Sb(Ⅴ)on bacte-rial metabolism.The expression levels of functional genes related to cell components were much more downregulated for the group with Sb(Ⅲ)but much more regulated for that with Sb(V).Notably,cytochrome c and nitrogen fixation-relevant genes for the A.f_Fe2+_Sb(Ⅲ)group were enhanced significantly,indicating their role in Sb(Ⅲ)resistance.This study is of great value for the development of antimony pollution control and remediation technology.
JarositeAcidithiobacillus ferrooxidansBacterial iron oxidationSb(Ⅲ)and Sb(Ⅴ)transformationTranscriptome analysis
Lu Chen、Yirong Wang、Hongchang Liu、Yuhang Zhou、Zhenyuan Nie、Jinlan Xia、Wensheng Shu
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School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,China
Key Lab of Biometallurgy of Ministry of Education of China,Central South University,Changsha 410083,China
School of Life Sciences,South China Normal University,Guangzhou 510631,China
Jarosite Acidithiobacillus ferrooxidans Bacterial iron oxidation Sb(Ⅲ)and Sb(Ⅴ)transformation Transcriptome analysis
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