Mechanisms of microbial-based iron reduction of clay minerals: Current understanding and latest developments

Yong, Shih Nee; Lim, Steven; Ho, Chun Loong; Chieng, Sylvia; Kuan, Seng How

doi:10.1016/j.clay.2022.106653

Cited by 14 publications

(4 citation statements)

References 125 publications

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“…Earlier studies also showed that microbial localization on mineral ores plays a crucial role in facilitating iron reduction, giving rise to the fundamental question of the ability of these two microbes to localize on the surface of the kaolin clay to facilitate iron internalization and reduction. 28 We discovered that the different culturing conditions also affect microbial localization and biofilm formation on the clay surface ( Figure S9 ). The accumulated biofilm produced by B. cereus cultured in LB and glucose medium showed 2-fold higher compared to 0.1LB medium ( Figure 5 A).…”

Section: Resultsmentioning

confidence: 98%

Elucidation of Iron(III) Bioleaching Properties of Gram-Positive Bacteria

Jing

Liu

2022

ACS Omega

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Microbial-based iron reduction is an emerging technology used as an alternative to conventional chemical-based iron reduction. The iron reduction in kaolin refinement is vital for enhancing its commercial value. Extensive studies on microbial-based iron reduction mainly focus on Gram-negative bacteria, whereas little is understood about Gram-positive bacteria’s mechanism and potential application. This study aims to investigate the iron-reducing mechanism of two Gram-positive bacterial isolates, Bacillus cereus (B. cereus) and Staphylococcus aureus (S. aureus). By varying the growth environment of bacteria and monitoring the biochemical changes during the process of iron reduction, the results show that Gram-positive bacterial iron reduction performance depends on the medium composition, differing from Gram-negative bacteria-based reduction processes. Nitrogen-rich medium facilitates the microbial basification of the medium, where the alkaline conditions impact the microbial iron reduction process by altering the gene expression involved in intracellular pH homeostasis and microbial growth. This discovery will contribute to the mineral refining processes and promote the development of microbial-based bioprocesses for ore purification, while also laying the foundation for investigating other Gram-positive bacterial iron-reducing ability.

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Section: Resultsmentioning

confidence: 98%

Elucidation of Iron(III) Bioleaching Properties of Gram-Positive Bacteria

Jing

Liu

2022

ACS Omega

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“…For example, main methods of kaolin bleaching comprises flocculation with polymers, chemical solubilization, extraction, and washing (Cobos-Murcia et al, 2022). Despite iron-reducing microorganisms can also be used for this purpose (Hosseini and Ahmadi, 2015;Yong et al, 2022), few studies report the utilization of heterotrophic acidophiles for kaolin bleaching (Kupka et al, 2007). On the other hand, metallic iron may be obtained from recalcitrant ores by the sequential using of iron-reducers (González et al, 2020) and electrowinning (Mostad et al, 2008).…”

Section: Biomining and Bioremediation Processesmentioning

confidence: 99%

Acidophilic heterotrophs: basic aspects and technological applications

González,

Vera,

Scott

et al. 2024

Front. Microbiol.

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Acidophiles comprise a group of microorganisms adapted to live in acidic environments. Despite acidophiles are usually associated with an autotrophic metabolism, more than 80 microorganisms capable of utilizing organic matter have been isolated from natural and man-made environments. The ability to reduce soluble and insoluble iron compounds has been described for many of these species and may be harnessed to develop new or improved mining processes when oxidative bioleaching is ineffective. Similarly, as these microorganisms grow in highly acidic media and the chances of contamination are reduced by the low pH, they may be employed to implement robust fermentation processes. By conducting an extensive literature review, this work presents an updated view of basic aspects and technological applications in biomining, bioremediation, fermentation processes aimed at biopolymers production, microbial electrochemical systems, and the potential use of extremozymes.

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“…In pristine subsurface environments, there is a characteristic sequence of microbial reduction processes based on the availability of key terminal electron acceptors and donors with nitrate dominating over Fe(III), sulfate, and CO 2 when O 2 is not present (Chapelle, 2000; Meleshyn, 2014). Since nitrate is not measurable in OPA rock (Pearson et al, 2003), Fe(III) from the clay minerals can serve as the primary electron acceptor in this environment (Yong et al, 2022). Thus, Fe(III)‐reducing microorganisms can be expected to dominate and outcompete SRB, which in turn would outcompete methanogenic organisms for electron donors, thereby inhibiting sulfate reduction and/or methane production (Chapelle, 2000).…”

Section: Introductionmentioning

confidence: 99%

Clay‐associated microbial communities and their relevance for a nuclear waste repository in the Opalinus Clay rock formation

et al. 2023

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Microorganisms are known to be natural agents of biocorrosion and mineral transformation, thereby potentially affecting the safety of deep geological repositories used for high‐level nuclear waste storage. To better understand how resident microbial communities of the deep terrestrial biosphere may act on mineralogical and geochemical characteristics of insulating clays, we analyzed their structure and potential metabolic functions, as well as site‐specific mineralogy and element composition from the dedicated Mont Terri underground research laboratory, Switzerland. We found that the Opalinus Clay formation is mainly colonized by Alphaproteobacteria, Firmicutes, and Bacteroidota, which are known for corrosive biofilm formation. Potential iron‐reducing bacteria were predominant in comparison to methanogenic archaea and sulfate‐reducing bacteria. Despite microbial communities in Opalinus Clay being in majority homogenous, site‐specific mineralogy and geochemistry conditions have selected for subcommunities that display metabolic potential for mineral dissolution and transformation. Our findings indicate that the presence of a potentially low‐active mineral‐associated microbial community must be further studied to prevent effects on the repository's integrity over the long term.

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Mechanisms of microbial-based iron reduction of clay minerals: Current understanding and latest developments

Cited by 14 publications

References 125 publications

Elucidation of Iron(III) Bioleaching Properties of Gram-Positive Bacteria

Elucidation of Iron(III) Bioleaching Properties of Gram-Positive Bacteria

Acidophilic heterotrophs: basic aspects and technological applications

Clay‐associated microbial communities and their relevance for a nuclear waste repository in the Opalinus Clay rock formation

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