Evidence of weak interaction between ferric iron and extracellular polymeric substances of Acidithiobacillus ferrooxidans
文献类型：期刊论文
| 作者 | Dong, Bingxu1,2,3; Jia, Yan1,2; Zhao, Haiping1,2,3; Tan, Qiaoyi1,2; Sun, Heyun1,2; Jiang, Chengying3,4; Ruan, Renman1,2 |
| 刊名 | HYDROMETALLURGY
 |
| 出版日期 | 2022-03-01 |
| 卷号 | 209页码:9 |
| 关键词 | Acidithiobacillus ferrooxidans Extracellular polymeric substances Acid-base titrations Surface complexation theory Ferric iron Contact leaching |
| ISSN号 | 0304-386X |
| DOI | 10.1016/j.hydromet.2022.105817 |
| 英文摘要 | Although 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. |
| WOS关键词 | CELL-SURFACE ; BACTERIAL SURFACES ; BACILLUS-SUBTILIS ; CD ADSORPTION ; PYRITE ; EPS ; XPS ; PH ; CHALCOPYRITE ; EXTRACTION |
| 资助项目 | Innovation Academy for Green Manufacture, Chinese Academy of Sciences[IAGM-2019A08] ; National Natural Science Foundation of China[51674231] |
| WOS研究方向 | Metallurgy & Metallurgical Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:000774192000006 |
| 出版者 | ELSEVIER |
| 资助机构 | Innovation Academy for Green Manufacture, Chinese Academy of Sciences ; National Natural Science Foundation of China |
| 源URL | [http://ir.ipe.ac.cn/handle/122111/52561]  |
| 专题 | 中国科学院过程工程研究所 |
| 通讯作者 | Ruan, Renman |
| 作者单位 | 1.Chinese Acad Sci, Inst Proc Engn, CAS Key Lab Green Proc & Engn, Beijing 100190, Peoples R China 2.Chinese Acad Sci, Natl Engn Res Ctr Green Recycling Strateg Met Res, 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 |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：过程工程研究所
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