Bacteria mediated Fenton-like reaction drives the biotransformation of carbon nanomaterials

Wang, Jingwei; Ma, Qiao; Zhang, Zhaojing; Li, Shuzhen; Diko, Catherine Sekyerebea; Dai, Chunxiao; Zhang, Henglin; Qu, Yuanyuan

doi:10.1016/j.scitotenv.2020.141020

Cited by 21 publications

(31 citation statements)

References 59 publications

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“…On the other hand, some MO molecules were rmly adsorbed on the material surface, which occupied the adsorbed active sites and cannot be effectively removed by activation. In a comprehensive analysis, Fe 3 O 4 /CBc was stable, 29,30 easily separately, and had a high reuse efficiency.…”

Section: Catalyst Regeneration Performancementioning

confidence: 99%

Removal of methyl orange from water by Fenton oxidation of magnetic coconut-clothed biochar

Wang

Feng

et al. 2022

RSC Adv.

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Section: Catalyst Regeneration Performancementioning

confidence: 99%

Removal of methyl orange from water by Fenton oxidation of magnetic coconut-clothed biochar

Wang

Feng

et al. 2022

RSC Adv.

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“…Although the degradation of CNTs in the environment depends on microbial activities, there have only been a few studies about the conversion or degradation of CNTs by microorganisms or their enzymes. None of these studies have led to a discussion of the degradation of CNTs in the general environment (Dai et al, 2006;Jhadav et al, 2009;Wang et al, 2020). In this study, it was found that CNTs are degraded by the Fenton reaction caused by iron released from bacterial heme enzymes.…”

Section: Degradation Of O-swcnts By Incubation In the Presence Of Another Heme Enzyme Of P Putidamentioning

confidence: 69%

“…Therefore, degradation of CNTs is estimated to take a very long time in the general environment. On the other hand, it was recently reported that the extracellular H2O2 concentration of bacteria increases in the presence of CNTs (Wang et al, 2020).…”

Section: Degradation Of O-swcnts By Incubation In the Presence Of Another Heme Enzyme Of P Putidamentioning

confidence: 97%

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Non-enzymatic degradation of carbon nanotubes in the presence of bacterial enzymes

Hori

Takahashi

Taguchi

2021

Preprint

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The enzymatic degradation of carbon nanotubes (CNTs) by several enzymes has been reported. However, because organisms that possess these enzymes have limited habitats and distribution areas, it is unclear whether CNTs can be degraded in the general environment. The investigation of CNTs degradation by enzymes derived from bacteria, which inhabit a wide range of environments and have diverse metabolic systems, is inevitable for predicting the environmental fate of CNTs. In this study, the degradation of oxidized (carboxylated) single-walled CNTs (O-SWCNTs) by mt2DyP, a dye-decolorizing peroxidase of Pseudomonas putida mt-2, a common soil bacterium, was investigated. Suspensions of O-SWCNTs gradually became transparent and their optical absorbance decreased during 30 d of incubation in the presence of mt2DyP produced by a recombinant Brevibacillus choshinensis strain and its substrate, H2O2. The degradation was enhanced by higher H2O2 concentrations. The measurement of Raman spectra revealed the complete degradation of O-SWCNTs after 30 d of incubation with 100 mM H2O2. However, surprisingly, this heme enzyme was inactivated within 60 min of the incubation with O-SWCNTs, which suggested that the degradation of O-SWCNTs was not catalyzed by the enzyme. The inactivation of mt2DyP was accompanied by the release of iron, which suggested that the degradation of the O-SWCNTs was owing to the Fenton reaction caused by the iron released from mt2DyP and the supplied H2O2. A chelating agent, diethylenetriaminepentaacetic acid, significantly inhibited the O-SWCNTs degradation, proving the degradation by the Fenton reaction. These phenomena were also observed with another heme enzyme, Cytochrome P450. These results are important for predicting the fate of CNTs in a wide range of environments, as heme enzymes are secreted by many bacteria in the environment. This study also shows that the effect of the Fenton reaction should be considered to validate the degradation of CNTs by heme enzymes.

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“…5 In recent years, investigations into the bacterial degradation and transformation of nanomaterials have emerged. 6 In these studies, multiple and diverse mechanisms underpinning the process have been illustrated, including the oxidation of graphite through direct extracellular electron transfer (EET), 7 the oxidation of graphene oxide (GO), reduced GO, single-walled carbon nanotubes (SWCNT), oxidized SWCNTs through the Fenton-like reaction, 8 the reduction of GO through direct EET 9,10 and extracellular superoxide, 11 and the reduction of dissolved Ag + to silver nanoparticles through a superoxide-dependent mechanism. 12,13 Clearly, these studies demonstrate the potential of the bacterial biotransformation of 2D nanomaterials, but case studies are lacking.…”

Section: ■ Introductionmentioning

confidence: 99%

Biotransformation of 2D Nanomaterials through Stimulated Bacterial Respiration-Produced Extracellular Reactive Oxygen Species: A Common but Overlooked Process

Shen

Sun

Yang

et al. 2022

Environ. Sci. Technol.

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The biotransformation of 2D nanomaterials is still poorly understood, although their environmental fates are becoming an increasing concern with their broad applications. Here, we found that Ti3C2T x nanosheets, a typical 2D nanomaterial, could be oxidized by reactive oxygen species (ROS) produced by both Gram-negative (Escherichia coli and Shewanella oneidensis) and Gram-positive (Bacillus subtilis) bacteria, with the formation of titanium dioxide (TiO2) on the nanosheet surfaces and impairment of structural integrity. Specifically, Ti3C2T x nanosheets stimulated bacterial respiration Complex I, leading to increased generation of extracellular O2 •– and the formation of H2O2 and •OH via Fenton-like reactions, which intensified the oxidation of the nanosheets. Surface modifications with KOH and hydrazine (HMH), especially HMH, could limit bacterial oxidation of the nanosheets. These findings reveal a common but overlooked process in which oxygen-respiring bacteria are capable of oxidizing 2D nanosheets, providing new knowledge for environmental fate evaluation and future design of functional 2D nanomaterials.

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Bacteria mediated Fenton-like reaction drives the biotransformation of carbon nanomaterials

Cited by 21 publications

References 59 publications

Removal of methyl orange from water by Fenton oxidation of magnetic coconut-clothed biochar

Removal of methyl orange from water by Fenton oxidation of magnetic coconut-clothed biochar

Non-enzymatic degradation of carbon nanotubes in the presence of bacterial enzymes

Biotransformation of 2D Nanomaterials through Stimulated Bacterial Respiration-Produced Extracellular Reactive Oxygen Species: A Common but Overlooked Process

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