Enhancement of hexavalent chromium reduction by Shewanella oneidensis MR-1 in presence of copper nanoparticles via stimulating bacterial extracellular electron transfer and environmental adaptability

Chen, Lang; Wu, Yang; Shen, Qiuting; Zheng, Xiong; Chen, Yinguang

doi:10.1016/j.biortech.2022.127686

Cited by 28 publications

(3 citation statements)

References 47 publications

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“…Xu et al [31] demonstrated that, under anaerobic conditions, S. oneidensis MR-1 exhibited high efficiency in reducing azo and humic substances. Chen et al [32] identified that S. oneidensis MR-1 could reduce toxic Cr(VI) to less harmful Cr(III) and domestication of this strain could enhance its reduction ability and tolerance towards Cr(VI). In addition to a direct reduction of Cr(VI), Shewanella can facilitate the process by assisting with Fe(II).…”

Section: Introductionmentioning

confidence: 99%

Goethite Enhances Cr(VI) Reduction by S. oneidensis MR-1 under Different Conditions: Mechanistic Insights

Hou,

Li,

Wang

et al. 2024

Microorganisms

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Chromium (Cr) contamination, widely present in the environment, poses a significant threat to both ecology and human health. Microbial remediation technology has become a hot topic in the field of heavy metal remediation due to its advantages, such as environmental protection, low cost, and high efficiency. This paper focused on using various characterization and analysis methods to investigate the bioreduction effect and mechanism of microorganisms on Cr(VI) under various influencing factors. The main contents and conclusions were as follows: Shewanella oneidensis MR-1 was selected as the target strain for studying its reduction of Cr(VI) at different inoculation amounts, temperatures, pH values, time intervals, etc. The results indicated that S. oneidensis MR-1 exhibited an optimal reduction effect on Cr(VI) at pH 7 and a temperature of 35 °C. Additionally, electron shuttles (ESs), including humic acid (HA) and 9,10-antraquinone-2,6-disulfonate (AQDS), were introduced into the degradation system to improve the reduction efficiency of S. oneidensis MR-1. Upon adding goethite further, S. oneidensis MR-1 significantly enhanced its reducing ability by converting Fe(III) minerals to Fe(II) and reducing Cr(VI) to Cr(III) during electron transfer.

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Section: Introductionmentioning

confidence: 99%

Goethite Enhances Cr(VI) Reduction by S. oneidensis MR-1 under Different Conditions: Mechanistic Insights

Hou,

Li,

Wang

et al. 2024

Microorganisms

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“…Hexavalent chromium (Cr 6+ ), as a common pollutant, is highly toxic and difficult to decompose and remove in water. It can accumulate and diffuse in the environment, causing serious pollution to water quality [24,25]. Cr 6+ can affect the metabolism of aquatic organisms and further affect the ecosystem balance of water bodies.…”

Section: Characteristics Of Water Quality Indicatorsmentioning

confidence: 99%

Study on the Impact of Emulsion on Mine Water Quality and Health Risk Assessment

Qiu,

Liu,

et al. 2023

Water

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The composition of emulsion is complex. In the process of coal mining, the emulsion required by the hydraulic equipment can enter the mine water through a variety of channels, thereby affecting the water quality of the mine. In this study, the mine water of a super large coal mine, Daliuta Coal Mine, was collected, and static and dynamic simulation tests were designed to analyze the changes in various water quality indicators of mine water containing different concentrations of emulsions over time. Furthermore, the health risk assessment model was applied to evaluate the health risks of hexavalent chromium (Cr6+) and chloride in mine water containing emulsions on different populations. The results indicate that the alkaline substances such as sodium castor oil in the emulsion can increase the pH value of mine water, but it is more obvious when the emulsion concentration is high. The mine water itself contains chloride and sulfate exceeding 300 and 400 mg/L, respectively, and the addition of emulsion under static conditions has little effect on them, while the amount of emulsion added under dynamic conditions reaches 20 mL/L, which has a significant impact. The emulsion contains a certain amount of Cr6+ and can affect the total dissolved solid content, total hardness, and other indicators of mine water through mechanisms such as adsorption, solubilization, and chemical precipitation. The calculation results of the health risk assessment model indicate that the excessive chloride in the mine water in the area poses a potential non-carcinogenic risk to all populations exposed to their environment. The health risk index of Cr6+ increases with the increase in emulsion content in mine water, and the potential non-carcinogenic risk is higher for children. Overall, emulsions can significantly deteriorate the quality of mine water. This research can provide a scientific theoretical basis for subsequent study of mine water pollutant treatment, water quality monitoring and management, and health risk assessment, thereby contributing to reducing the health risks it brings and protecting the safety of local groundwater quality.

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“…Figure 5B shows the formation of the towery iron encrustation. Different from the formation of tiled iron encrustation, to form the towery iron encrustation, Fe(II) gives the electron to the iron precipitate and becomes Fe(III) [38,39]. Fe(III) continues precipitating on the iron precipitate.…”

Section: The Conceptual Mechanism Of Shewanella Sp Strain F1 To Perfo...mentioning

confidence: 99%

Efficiency Determination and Mechanism Investigation of Autotrophic Denitrification Strain F1 to Promote Low-Carbon Development

Qin

Wan

Liu

et al. 2022

Water

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Shewanella sp. strain F1, isolated from a lab-scale Fe(II)−dependent anaerobic denitrifying reactor, could reduce nitrate by oxidizing Fe(II). Its nitrate reduction rate and Fe(II) oxidation rate were 0.48 mg/(L·h) and 5.05 mg/(L·h) at OD600 of 0.4786 with a five-fold diluent. Shewanella sp. was popular in Fe(III) reduction. Fewer studies about its ability for Fe(II) oxidation are available. The low pH was determined to be the switch for Shewanella sp. strain F1 to perform Fe(III) reduction or Fe(II) oxidation. Even under a low pH, the produced Fe(III) precipitated around cells from iron encrustation. By observation of the morphologies of strain F1, two corresponding microbial mechanisms were proposed. One was named Cyc 2−based Fe(II)-dependent denitrification, in which Fe(II) was oxidized by Cyc 2 in the outer cell membrane, and the produced Fe(III) precipitated on the cell wall surface to form tiled iron encrustation. The other was named Cyc 1−based Fe(II)−dependent denitrification, in which Fe(II) was oxidized on the existing iron precipitation on the cell wall surface to form towery iron encrustation, and the electron was transported to Cyc 1 in the periplasm. The efficiency determination and mechanism investigation of strain F1 will promote the development of autotrophic denitrification technology and meet the requirement of a low−carbon policy.

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Enhancement of hexavalent chromium reduction by Shewanella oneidensis MR-1 in presence of copper nanoparticles via stimulating bacterial extracellular electron transfer and environmental adaptability

Cited by 28 publications

References 47 publications

Goethite Enhances Cr(VI) Reduction by S. oneidensis MR-1 under Different Conditions: Mechanistic Insights

Goethite Enhances Cr(VI) Reduction by S. oneidensis MR-1 under Different Conditions: Mechanistic Insights

Study on the Impact of Emulsion on Mine Water Quality and Health Risk Assessment

Efficiency Determination and Mechanism Investigation of Autotrophic Denitrification Strain F1 to Promote Low-Carbon Development

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