CAS OpenIR

Evidence of weak interaction between ferric iron and extracellular polymeric substances of Acidithiobacillus ferrooxidans

Dong, Bingxu1,2,3; Jia, Yan1,2; Zhao, Haiping1,2,3; Tan, Qiaoyi1,2; Sun, Heyun1,2; Jiang, Chengying3,4; Ruan, Renman1,2
2022-03-01
Source PublicationHYDROMETALLURGY
ISSN0304-386X
Volume209Pages:9
AbstractAlthough ferric iron in extracellular polymeric substances (EPS) was believed to be pivotal in bioleaching, the real existing form of ferric iron in EPS has remained poorly understood. In this study, whole cells of Acidithiobacillus ferrooxidans were used to study the composition and properties of EPS. The components sugars, proteins and uronic acids could be extracted from cells rich in EPS. Four distinct surface functional groups were characterized on the bacterial surfaces by the fitting of titration data. Subsequently, these functional groups were confirmed as carboxyl groups, phosphoryl groups, thiol groups, and amine groups by combining FTIR and XPS. However, with the help of modeling results and FTIR, these functional groups failed to dissociate protons in a strong acidic environment. The protonated functional groups could unlikely complex ferric iron according to the site-specific surface complexation theory. Besides, the isolated EPS could not sharply reduce the concentration of free ferric ions, and the ferric iron could be removed by washing the cell surfaces with HClO4. These results indicate that there is no strong chemical interaction between bacteria and ferric iron. This study suggests a weak interaction of ferric iron with the EPS of A. ferrooxidans, and gives some deeper insight into the microenvironment of EPS.
KeywordAcidithiobacillus ferrooxidans Extracellular polymeric substances Acid-base titrations Surface complexation theory Ferric iron Contact leaching
DOI10.1016/j.hydromet.2022.105817
Language英语
WOS KeywordCELL-SURFACE ; BACTERIAL SURFACES ; BACILLUS-SUBTILIS ; CD ADSORPTION ; PYRITE ; EPS ; XPS ; PH ; CHALCOPYRITE ; EXTRACTION
Funding ProjectInnovation Academy for Green Manufacture, Chinese Academy of Sciences[IAGM-2019A08] ; National Natural Science Foundation of China[51674231]
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
Funding OrganizationInnovation Academy for Green Manufacture, Chinese Academy of Sciences ; National Natural Science Foundation of China
WOS IDWOS:000774192000006
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/52562
Collection中国科学院过程工程研究所
Corresponding AuthorRuan, Renman
Affiliation1.Chinese Acad Sci, Natl Engn Res Ctr Green Recycling Strateg Met Res, Beijing 100190, Peoples R China
2.Chinese Acad Sci, Inst Proc Engn, CAS Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Chinese Acad Sci, Inst Microbiol, State Key Lab Microbial Resources, Beijing 100101, Peoples R China
Recommended Citation
GB/T 7714
Dong, Bingxu,Jia, Yan,Zhao, Haiping,et al.

Evidence of weak interaction between ferric iron and extracellular polymeric substances of Acidithiobacillus ferrooxidans

[J]. HYDROMETALLURGY,2022,209:9.
APA Dong, Bingxu.,Jia, Yan.,Zhao, Haiping.,Tan, Qiaoyi.,Sun, Heyun.,...&Ruan, Renman.(2022).

Evidence of weak interaction between ferric iron and extracellular polymeric substances of Acidithiobacillus ferrooxidans

.HYDROMETALLURGY,209,9.
MLA Dong, Bingxu,et al."

Evidence of weak interaction between ferric iron and extracellular polymeric substances of Acidithiobacillus ferrooxidans

".HYDROMETALLURGY 209(2022):9.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Dong, Bingxu]'s Articles
[Jia, Yan]'s Articles
[Zhao, Haiping]'s Articles
Baidu academic
Similar articles in Baidu academic
[Dong, Bingxu]'s Articles
[Jia, Yan]'s Articles
[Zhao, Haiping]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Dong, Bingxu]'s Articles
[Jia, Yan]'s Articles
[Zhao, Haiping]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.