Roles of reactive oxygen species in antibiotic resistant bacteria inactivation and micropollutant degradation in Fenton and photo-Fenton processes

Ahmed, Yunus; Zhong, Jiexi; Yuan, Zhiguo; Guo, Jianhua

doi:10.1016/j.jhazmat.2022.128408

Cited by 57 publications

(9 citation statements)

References 41 publications

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“…A straight line was detected in the presence of H 2 O 2 alone, indicating the absence of •OH generation (Figure 3d). When mMn/SAE was added to the H 2 O 2 solutions (5 min), the typical ESR spectra had four lines with an intensity ratio of 1:2:2:1, [56] which further implied the generation of •OH. The signal of •OH gradually increased with time (10 min).…”

Section: Resultsmentioning

confidence: 98%

Tumor Response and NIR‐II Photonic Thermal Co‐Enhanced Catalytic Therapy Based on Single‐Atom Manganese Nanozyme

et al. 2022

Adv Funct Materials

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Single‐atom nanozymes (SAzymes) can effectively mimic the metal active centers of natural enzymes at the atomic level owing to their atomically dispersed active sites, thereby maximizing atom utilization efficiency and density of active sites. Hence, SAzymes can be considered the most promising candidates to replace natural enzymes. Herein, a PEGylated mesoporous Mn‐based single‐atom nanozyme (PmMn/SAE) employing a coordination‐assisted polymerization pyrolysis strategy that uses polydopamine for photothermal‐augmented nanocatalytic therapy is designed. PmMn/SAE exhibits excellent multiple enzymatic performance, including catalase‐like, oxidase‐like, and peroxidase (POD)‐like performance, due to the atomically dispersed Mn active species. As a result, PmMn/SAE not only catalyzes the decomposition of endogenous H2O2 to generate O2 for relieving hypoxia inside the tumor but also transfers electrons to O2 to produce superoxide radicals to kill tumor cells. Meanwhile, PmMn/SAE is able to trigger Fenton‐like reactions to generate highly toxic hydroxyl radicals to induce cancer cell apoptosis. The POD‐like catalytic mechanism of mMn/SAE is revealed using experimental results and density functional theory. Furthermor, PmMn/SAE shows good photothermal conversion efficiency (η = 22.1%) in the second near‐infrared region (1064 nm). Both the in vitro and in vivo experimental results indicate that PmMn/SAE can effectively kill cancer cells through photothermal‐enhanced catalytic therapy.

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Section: Resultsmentioning

confidence: 98%

Tumor Response and NIR‐II Photonic Thermal Co‐Enhanced Catalytic Therapy Based on Single‐Atom Manganese Nanozyme

et al. 2022

Adv Funct Materials

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“…The FeS 2 @GO composite was separated from the reaction medium by centrifugation. The details of ARB enumeration and bacterial regrowth were explained in our previous studies − as well as Texts S3 and S4. For ARG, the extraction of DNA and quantification of respective genes by real-time PCR (RT-PCR) analysis were described in Texts S5 and S6 according to our previous studies. , The standard curve of each gene is illustrated in Figure S1.…”

Section: Materials and Methodsmentioning

confidence: 99%

Simultaneous Removal of Antibiotic Resistant Bacteria, Antibiotic Resistance Genes, and Micropollutants by FeS₂@GO-Based Heterogeneous Photo-Fenton Process

Ahmed

Zhong

Wang

et al. 2022

Environ. Sci. Technol.

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The co-occurrence of various chemical and biological contaminants of emerging concerns has hindered the application of water recycling. This study aims to develop a heterogeneous photo-Fenton treatment by fabricating nano pyrite (FeS2) on graphene oxide (FeS2@GO) to simultaneously remove antibiotic resistant bacteria (ARB), antibiotic resistance genes (ARGs), and micropollutants (MPs). A facile and solvothermal process was used to synthesize new pyrite-based composites. The GO coated layer forms a strong chemical bond with nano pyrite, which enables to prevent the oxidation and photocorrosion of pyrite and promote the transfer of charge carriers. Low reagent doses of FeS2@GO catalyst (0.25 mg/L) and H2O2 (1.0 mM) were found to be efficient for removing 6-log of ARB and 7-log of extracellular ARG (e-ARG) after 30 and 7.5 min treatment, respectively, in synthetic wastewater. Bacterial regrowth was not observed even after a two-day incubation. Moreover, four recalcitrant MPs (sulfamethoxazole, carbamazepine, diclofenac, and mecoprop at an environmentally relevant concentration of 10 μg/L each) were completely removed after 10 min of treatment. The stable and recyclable composite generated more reactive species, including hydroxyl radicals (HO•), superoxide radicals (O2 • –), singlet oxygen (1O2). These findings highlight that the synthesized FeS2@GO catalyst is a promising heterogeneous photo-Fenton catalyst for the removal of emerging contaminants.

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“…Advanced oxidation processes (AOPs) are technological approaches that use strongly oxidizing radicals (mostly OH radicals) to degrade organic pollutants and are broadly defined as chemical oxidation techniques. − The photo-Fenton process is an inexpensive, simple, environmentally friendly, and efficient method commonly used to treat difficult-to-degrade organic pollutants. − However, the process has many problems that limit its practical application, such as high H 2 O 2 demand, poor recoverability, and low conversion efficiency between Fe 3+ and Fe 2+ . The use of one advanced oxidation technology alone often does not achieve good treatment results, especially for environmentally complex treatment of actual antibiotics. , Combined advanced oxidation technologies can reduce the need for H 2 O 2 and shorten the reaction time.…”

Section: Introductionmentioning

confidence: 99%

FeOOH Quantum Dot-Coupled Z-Scheme BiVO₄/g-C₃N₄ Heterojunction for Enhancing Photo-Fenton Reactions

Liu,

Li,

Yang

et al. 2023

ACS Appl. Nano Mater.

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Herein, FeOOH quantum dots and a Z-scheme BiVO 4 /g-C 3 N 4 catalyst were coupled to obtain a Z-scheme heterojunction for photo-Fenton reactions to facilitate the transport of electrons and the generation of radicals. The obtained materials exhibited better visible light-driven photo-Fenton degradation of Rhodamine B, which is 22.06 times as high as pure BiVO 4 , 18.65 times as high as pure g-C 3 N 4 , and 3.44 times as high as BiVO 4 /g-C 3 N 4 , showing great potential in photo-Fenton degradation of pollutants. Moreover, the performance tests, radical capture experiments, and time-resolved fluorescence spectroscopy revealed that electron migration exists between the BiVO 4 /g-C 3 N 4 and FeOOH-QDs. This composite system accelerates the cycling of Fe 3+ /Fe 2+ during the photo-Fenton process, thus continuously generating reactive species (hydroxyl radicals (−OH) and superoxide radicals (−O 2 − )), leading to the rapid degradation of organic pollutants.

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Roles of reactive oxygen species in antibiotic resistant bacteria inactivation and micropollutant degradation in Fenton and photo-Fenton processes

Cited by 57 publications

References 41 publications

Tumor Response and NIR‐II Photonic Thermal Co‐Enhanced Catalytic Therapy Based on Single‐Atom Manganese Nanozyme

Tumor Response and NIR‐II Photonic Thermal Co‐Enhanced Catalytic Therapy Based on Single‐Atom Manganese Nanozyme

Simultaneous Removal of Antibiotic Resistant Bacteria, Antibiotic Resistance Genes, and Micropollutants by FeS₂@GO-Based Heterogeneous Photo-Fenton Process

FeOOH Quantum Dot-Coupled Z-Scheme BiVO₄/g-C₃N₄ Heterojunction for Enhancing Photo-Fenton Reactions

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Roles of reactive oxygen species in antibiotic resistant bacteria inactivation and micropollutant degradation in Fenton and photo-Fenton processes

Cited by 57 publications

References 41 publications

Tumor Response and NIR‐II Photonic Thermal Co‐Enhanced Catalytic Therapy Based on Single‐Atom Manganese Nanozyme

Tumor Response and NIR‐II Photonic Thermal Co‐Enhanced Catalytic Therapy Based on Single‐Atom Manganese Nanozyme

Simultaneous Removal of Antibiotic Resistant Bacteria, Antibiotic Resistance Genes, and Micropollutants by FeS2@GO-Based Heterogeneous Photo-Fenton Process

FeOOH Quantum Dot-Coupled Z-Scheme BiVO4/g-C3N4 Heterojunction for Enhancing Photo-Fenton Reactions

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Product

Resources

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Simultaneous Removal of Antibiotic Resistant Bacteria, Antibiotic Resistance Genes, and Micropollutants by FeS₂@GO-Based Heterogeneous Photo-Fenton Process

FeOOH Quantum Dot-Coupled Z-Scheme BiVO₄/g-C₃N₄ Heterojunction for Enhancing Photo-Fenton Reactions