Extracellular polymeric substances enhance dissolution and microbial methylation of mercury sulfide minerals

Zhang, Zhanhua; Zhao, Zhenyu; Fang, Qingxuan; Qiao, Ruohong; Zhang, Tong

doi:10.1039/d2em00394e

Cited by 8 publications

(6 citation statements)

References 66 publications

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“…The mer genes are not limited to bacteria, having also been discovered in archaebacteria including Sulfolobus solfataricus, Halobacterium, Halococcs strain, and Asgard archaea (Artz et al, 2015;C. J. Zhang, Liu, et al, 2023;Z. Zhang, Zhao, et al, 2023).…”

Section: Intrinsic and Engineered Microbial Bioremediationmentioning

confidence: 99%

“…Likewise, sulphate‐reducing bacteria species have been exploited for the removal of Hg from wetlands via adsorption mechanisms, however, the reported removal efficiency is relatively low (Diao et al, 2023). Transgenic bacteria with modified genetic mechanisms for Hg resistance and efflux processes have been developed, resulting in greater resistance to Hg in the transgenic strains (J. Zhang, Li, et al, 2023; C. J. Zhang, Liu, et al, 2023; Z. Zhang, Zhao, et al, 2023). Table 2 summarises the transgenic microbes used in Hg remediation processes described in the literature.…”

Section: Microbial Bioremediationmentioning

confidence: 99%

“…The mer operon genes, which are typically found on genomic DNA (R. Zheng et al, 2018), plasmids (D. Li, Li, et al, 2022; X. Li, Yang, et al, 2022), the components of the Tn21 transposon in plastids (Dhir, 2019) and integrons (Dunon et al, 2022) are all variable in their number and characters. The mer genes are not limited to bacteria, having also been discovered in archaebacteria including Sulfolobus solfataricus , Halobacterium , Halococcs strain, and Asgard archaea (Artz et al, 2015; J. Zhang, Li, et al, 2023; C. J. Zhang, Liu, et al, 2023; Z. Zhang, Zhao, et al, 2023). They function as promoters, regulators or operators as well as functional genes.…”

Section: Microbial Bioremediationmentioning

confidence: 99%

“…Hg is emitted to the natural environment through innumerable anthropogenic activities, including Hg mining and processing, artisanal gold mining, fossil fuel burning, waste burning or various other polluting activities, as well as natural processes, such as forest fires and volcanic eruptions (Beckers & Rinklebe, 2017; Joy & Qureshi, 2023; O'Connor et al, 2019; Q. Yang et al, 2021). The emitted inorganic Hg (IHg) species, including Hg 2+ and Hg 0 , neutral Hg sulphides and Hg thiols, can be converted to the more toxic and bioavailable form of methylmercury (MeHg) by anaerobic microorganisms (Lyu et al, 2020; Xiang et al, 2022; J. Zhang, Li, et al, 2023; C. J. Zhang, Liu, et al, 2023; Z. Zhang, Zhao, et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

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Bioremediation of mercury contaminated soil and water: A review

Kumar,

Chawla

et al. 2023

Land Degrad Dev

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Mercury (Hg) pollution of soil and water environments is a major global threat to human health, agri‐food systems and ecosystems and industrial activities mainly coal combustion augmented their content in different environmental media. Bioremediation is a nature‐based solution involving microbial‐ and plant‐based (phytoremediation) technologies that clean‐up Hg contaminated sites. Here, we review Hg‐resistant bacteria and how latest insights in our understanding of the cellular and biochemical mechanisms of the mer operon genes responsible for Hg resistance and transformation have facilitated developments in microbial Hg‐bioremediation. We also review the phytoremediation mechanisms, including those of bacterial‐ and fungi‐assisted phytoremediation processes, which have shown promising results in reducing Hg2+ to Hg0. This review provides a detailed knowledge of novel Hg bioremediation mechanisms and methods. Consequently, microbial‐ and phyto‐based bioremediation technologies have a critical role in the reclamation of Hg‐contaminated environments and the protection of human health and ecosystems.

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Section: Intrinsic and Engineered Microbial Bioremediationmentioning

confidence: 99%

Section: Microbial Bioremediationmentioning

confidence: 99%

Section: Microbial Bioremediationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Bioremediation of mercury contaminated soil and water: A review

Kumar,

Chawla

et al. 2023

Land Degrad Dev

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“…There are several sources of mercury as cinnabar rocks, which are formed through volcanic activity or the natural weathering of rock. It has up to 86% of its content mercury which releases mercury in various forms to the environment [ 53 , 54 ]. As well, human activity through coal combustion, electrical power production and industrial waste disposal is the main source of mercury contamination in the environment [ 45 ].…”

Section: Introductionmentioning

confidence: 99%

Green synthesis of silver nanoparticles and its environmental sensor ability to some heavy metals

Ibrahim,

Taha,

Hagaggi

et al. 2024

BMC Chemistry

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This study marks a pioneering effort in utilizing Vachellia tortilis subsp. raddiana (Savi) Kyal. & Boatwr., (commonly known as acacia raddiana) leaves as both a reducing and stabilizing agent in the green “eco-friendly” synthesis of silver nanoparticles (AgNPs). The research aimed to optimize the AgNPs synthesis process by investigating the influence of pH, temperature, extract volume, and contact time on both the reaction rate and the resulting AgNPs' morphology as well as discuss the potential of AgNPs in detecting some heavy metals. Various characterization methods, such as UV–vis spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), infrared spectroscopy (IR), Zeta sizer, EDAX, and transmitting electron microscopy (TEM), were used to thoroughly analyze the properties of the synthesized AgNPs. The XRD results verified the successful production of AgNPs with a crystallite size between 20 to 30 nm. SEM and TEM analyses revealed that the AgNPs are primarily spherical and rod-shaped, with sizes ranging from 8 to 41 nm. Significantly, the synthesis rate of AgNPs was notably higher in basic conditions (pH 10) at 70 °C. These results underscore the effectiveness of acacia raddiana as a source for sustainable AgNPs synthesis. The study also examined the AgNPs' ability to detect various heavy metal ions colorimetrically, including Hg2+, Cu2+, Pb2+, and Co2+. UV–Vis spectroscopy proved useful for this purpose. The color of AgNPs shifts from brownish-yellow to pale yellow, colorless, pale red, and reddish yellow when detecting Cu2+, Hg2+, Co2+, and Pb2+ ions, respectively. This change results in an alteration of the AgNPs' absorbance band, vanishing with Hg2+ and shifting from 423 to 352 nm, 438 nm, and 429 nm for Cu2+, Co2+, and Pb2+ ions, respectively. The AgNPs showed high sensitivity, with detection limits of 1.322 × 10–5 M, 1.37 × 10–7 M, 1.63 × 10–5 M, and 1.34 × 10–4 M for Hg2+, Cu2+, Pb2+, and Co2+, respectively. This study highlights the potential of using acacia raddiana for the eco-friendly synthesis of AgNPs and their effectiveness as environmental sensors for heavy metals, showcasing strong capabilities in colorimetric detection.

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