Characterization of Microbe-Mineral Interfacial Interaction Based on Synchrotron Radiation Techniques

Xia, Jin Lan; Liu, Hong Chang; Nie, Zhen Yuan; Zhu, Hong Rui; Yang, Yun; Wang, Lei; Song, Jian Jun; Zhao, Changhui; Long, Ya; Zhao, Yi; Yan, Chuanwei; Zhen, Xiang

doi:10.4028/www.scientific.net/amr.1130.123

Cited by 2 publications

(2 citation statements)

References 13 publications

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“…Compared with the sterile group, [Hg 2+ ] decreased slower and was higher for the bio group, indicating that pyrite enables the strong adsorption of Hg 2+ . Due to the Hg transformation of bacteria, Hg exists in the solution for a long time [26]. With the utilization of pyrite by A. ferrooxidans ATCC 23270, a small amount of Hg 2+ returns to the solution through the mercury transformation of bacteria [27], resulting in the fluctuation of [Hg 2+ ] in the solution for the bio groups over time.…”

Section: Changes In Ph and [Hg 2+ ] In Aqueous Solutionmentioning

confidence: 99%

Fe/S Redox-Coupled Mercury Transformation Mediated by Acidithiobacillus ferrooxidans ATCC 23270 under Aerobic and/or Anaerobic Conditions

Liu

et al. 2023

Microorganisms

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Bioleaching processes or microbially mediated iron/sulfur redox processes in acid mine drainage (AMD) result in mineral dissolution and transformation, the release of mercury and other heavy metal ions, and changes in the occurrence forms and concentration of mercury. However, pertinent studies on these processes are scarce. Therefore, in this work, the Fe/S redox-coupled mercury transformation mediated by Acidithiobacillus ferrooxidans ATCC 23270 under aerobic and/or anaerobic conditions was studied by combining analyses of solution behavior (pH, redox potential, and Fe/S/Hg ion concentrations), the surface morphology and elemental composition of the solid substrate residue, the Fe/S/Hg speciation transformation, and bacterial transcriptomics. It was found that: (1) the presence of Hg2+ significantly inhibited the apparent iron/sulfur redox process; (2) the addition of Hg2+ caused a significant change in the composition of bacterial surface compounds and elements such as C, N, S, and Fe; (3) Hg mainly occurred in the form of Hg0, HgS, and HgSO4 in the solid substrate residues; and (4) the expression of mercury-resistant genes was higher in earlier stages of growth than in the later stages of growth. The results indicate that the addition of Hg2+ significantly affected the iron/sulfur redox process mediated by A. ferrooxidans ATCC 23270 under aerobic, anaerobic, and coupled aerobic–anaerobic conditions, which further promoted Hg transformation. This work is of great significance for the treatment and remediation of mercury pollution in heavy metal-polluted areas.

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Section: Changes In Ph and [Hg 2+ ] In Aqueous Solutionmentioning

confidence: 99%

Fe/S Redox-Coupled Mercury Transformation Mediated by Acidithiobacillus ferrooxidans ATCC 23270 under Aerobic and/or Anaerobic Conditions

Liu

et al. 2023

Microorganisms

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“…It is noted that the mechanism of interaction and the efficiency of bioleaching could be defined by the chemical speciation and microstructure of and biofilms on the mineral surface, which could be changing with bioleaching and thus effectuate the going on or inhibition of the bioleaching process. We have reported some part of such work in IBS2015 [1], in which the synchrotron radiation-based techniques, including X-ray absorption near-edge spectroscopy (XANES), X-ray Diffraction (XRD), micro-X-ray fluorescence (-XRF) mapping and micro-scanning transmission X-ray microscopy (-STXM) imaging, together with other accessory approaches such as SEM/EDS, Raman spectroscopy, FT-IR spectroscopy, and electrochemical methods were presented. Here in form of an overview, we provide the most newly relevant progresses.…”

Section: Introductionmentioning

confidence: 99%

<i>In Situ</i> Characterization and Molecular Mechanisms Evaluation of Interfacial Interaction between Minerals and Bioleaching Microorganisms

Xia

Liu

Nie

et al. 2017

SSP

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This article presents as follows the most recent progresses of our group on in-situ characterization and evaluation of the molecular mechanisms of interfacial interaction of minerals and bioleaching microorganisms. (1) By studying the speciation transformation of iron/copper/sulfur on the mineral surface, the evolution of cell surface properties and EPS composition, the evolution of microbial community structure, and the evolution of expression of key oxidase genes during bioleaching, to characterize the adaptation process and therein the effects of it on the specific sulfur oxidation efficiency of bioleaching; (2) by in-situ characterization of the evolution of chalcopyrite surface microstructure, chemical speciation and the biofilm formation, to illustrate the specific adsorption and the relationship between cell growth/biofilm formation and the structure and speciation on the defect mineral surface; (3) by studying the utilization, transformation and activation of S0, which is one of the major intermediates during bioleaching, and the distribution of extracellular thiol groups and iron speciation, to evaluate in situ the sulfur activation mechanism; and (4) by comparative proteomics study of the extracellular and outmembrane proteins and looking up the genome sequence, to screen sulfur activation/transportation relevant proteins and genes.

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Characterization of Microbe-Mineral Interfacial Interaction Based on Synchrotron Radiation Techniques

Cited by 2 publications

References 13 publications

Fe/S Redox-Coupled Mercury Transformation Mediated by Acidithiobacillus ferrooxidans ATCC 23270 under Aerobic and/or Anaerobic Conditions

Fe/S Redox-Coupled Mercury Transformation Mediated by Acidithiobacillus ferrooxidans ATCC 23270 under Aerobic and/or Anaerobic Conditions

<i>In Situ</i> Characterization and Molecular Mechanisms Evaluation of Interfacial Interaction between Minerals and Bioleaching Microorganisms

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