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Investigation of Elemental Sulfur Speciation Transformation Mediated by Acidithiobacillus ferrooxidans |
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| Authors: | Huan He Cheng-Gui Zhang Jin-Lan Xia An-An Peng Yi Yang Hong-Chen Jiang Lei Zheng Chen-Yan Ma Yi-Dong Zhao Zhen-Yuan Nie Guan-Zhou Qiu |
| Institution: | 1. Key Laboratory of Biometallurgy of Ministry of Education of China, School of Minerals Processing & Bioengineering, The South Road of YueLu Mountain, Central South University, Changsha, Hunan, 410083, China 2. Geomicrobiology Laboratory, State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences and Resources, China University of Geosciences, Beijing, 100083, China 3. Institute of High Energy Physics, Chinese Academy of Science, Beijing Synchrotron Radiation Facility, Beijing, 100049, China |
| Abstract: | The speciation transformation of elemental sulfur mediated by the leaching bacterium Acidithiobacillus ferrooxidans was investigated using an integrated approach including scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, energy dispersive X-ray spectroscopy, and X-ray absorption near edge spectroscopy (XANES). Our results showed that when grown on elemental sulfur powder, At. ferrooxidans ATCC23270 cells were first attached to sulfur particles and modified the surface sulfur with some amphiphilic compounds. In addition, part of the elemental sulfur powder might be converted to polysulfides. Furthermore, sulfur globules were accumulated inside the cells. XANES spectra of these cells suggested that these globules consisted of elemental sulfur bound to thiol groups of protein. Huan He and Cheng-Gui Zhang made equal contributions to this paper. |
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