Interaction mechanism between multi-layered MoS2 and H2O2 for self-generation of reactive oxygen species

Li, Qing; Hu, Baoshan; Yang, Qian; Cai, Xia; Nie, Meng; Jin, Yan; Zhou, Li; Xu, Yuheng; Pan, Qing‐Jiang; Fang, Liang

doi:10.1016/j.envres.2020.110227

Cited by 48 publications

(18 citation statements)

References 43 publications

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“…To check whether active intermediate 1 O 2 is generated in the system, a catalytic reaction was studied in the presence of sodium azide (NaN 3 ). 45,46 Evidently, with the addition of NaN 3 , the absorbance at 652 nm dramatically decreased, indicating the presence of numerous 1 O 2 (Figure 3f). These findings confirm that the peroxidase-mimicking activity of Fe-G nanozyme derives from the formation of 1 O 2 and O 2…”

Section: ■ Results and Discussionmentioning

confidence: 93%

“… After coincubation of Fe-G nanozyme, H 2 O 2 , and TMB with p -benzoquinone, a remarkable decrease in absorbance was observed, implying that O 2 •– was formed during the catalytic process (Figure e). To check whether active intermediate 1 O 2 is generated in the system, a catalytic reaction was studied in the presence of sodium azide (NaN 3 ). , Evidently, with the addition of NaN 3 , the absorbance at 652 nm dramatically decreased, indicating the presence of numerous 1 O 2 (Figure f). These findings confirm that the peroxidase-mimicking activity of Fe-G nanozyme derives from the formation of 1 O 2 and O 2 •– species.…”

Section: Resultsmentioning

confidence: 99%

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Lysozyme-Functionalized 5-Methyl-2-thiouracil Gold/Silver Nanoclusters for Luminescence Assay of Alkaline Phosphatase

Wang

Zhou

Cheng

2021

ACS Appl. Nano Mater.

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Herein, lysozyme-functionalized 5-methyl-2-thiouracil gold/silver nanoclusters (5-MTU/Lys Au/Ag NCs) with an orange-red fluorescence peak at 600 nm (quantum yield = 33.18%) were obtained through a simple blending route. Owing to the synergistic effect between Au and Ag and the formation of rigid host–guest assemblies between 5-MTU and the guanidine group of lysozymes, the chemical properties of 5-MTU/Lys Au/Ag NCs were significantly improved. Taking advantage of the exceptional optical properties and satisfactory stability of 5-MTU/Lys Au/Ag NCs, a fresh and sensitive fluorescent probe for monitoring alkaline phosphatase (ALP) was strategically constructed by the integration of 5-MTU/Lys Au/Ag NCs and the nanozyme with a graphene structure (Fe-G nanozyme) for the first time. Briefly, the fluorescence of 5-MTU/Lys Au/Ag NCs was initially quenched by indigo carmine (IC) through the inner filter effect (IFE) mechanism, but it was restored upon the introduction of H2O2 and Fe-G nanozyme by generating reactive oxygen species (ROS) (1O2/O2 •–) and promoting the oxidative degradation of IC, whereas the fluorescence was quenched again in the presence of ALP via hydrolyzing l-ascorbic acid-2-phosphate (AAP). By monitoring the changes in signal intensity, the proposed fluorescent sensing platform presented a highly selective and excellent performance toward ALP, exhibiting a good linear relationship from 0.5 to 10 U L–1 and providing a low detection limit of 0.193 U L–1. Furthermore, the proposed biosensor showed satisfactory results for quantifying ALP in human serum.

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Section: ■ Results and Discussionmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Lysozyme-Functionalized 5-Methyl-2-thiouracil Gold/Silver Nanoclusters for Luminescence Assay of Alkaline Phosphatase

Wang

Zhou

Cheng

2021

ACS Appl. Nano Mater.

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“…55 Multilayered MoS 2 also promotes the self-generation of ROS in H 2 O 2 solutions. 56 H 2 O 2 attacks the intralayer Mo−S covalent bonds and weakens the van der Waals forces between the adjacent layers, leading to spontaneous exfoliation. The resulting MoS 2 flakes can subsequently be cut into smaller nanosheets or QDs.…”

Section: Use Of Mos 2 Nanomaterials To Generatementioning

confidence: 99%

Using MoS₂ Nanomaterials to Generate or Remove Reactive Oxygen Species: A Review

Yang

et al. 2021

ACS Appl. Nano Mater.

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Molecular oxygen-derived free radicals and molecules that are highly reactive are generally referred to as reactive oxygen species (ROS). ROS are critical to the performance of redox-reaction-based environmental remediation approaches and at the same time are important players in the regulation of gene expression and cell signaling cascades. The irregular fluctuation of ROS can cause severe damage to the human body. Developing materials to modulate the amount of ROS is of great importance to environmental and biomedical sciences. Molybdenum disulfide (MoS 2 ) is a prototypical transition-metal dichalcogenide that has become a star in the family of 2D materials due to its unique physicochemical properties. The band gap, catalytic activity, and piezoelectric property of MoS 2 can be easily tuned by modifying its size, structure, phase, and doping with other functional materials. Some MoS 2 nanomaterials are emerging as promising candidates for generating or scavenging ROS. On the one hand, MoS 2 nanomaterials can effectively cause the generation of ROS via the photocatalytic reactions, photocytotoxic reactions, Fenton-like reactions, permonosulfate (PMS) activations, and piezoelectric effects. On the other hand, the exposed Mo 6+ / Mo 4+ redox couples render MoS 2 nanomaterials with antioxidant enzyme-like activity, through which ROS can be efficiently quenched. In this Review, recent advances in the applications of MoS 2 for modulating ROS are summarized. Current gaps as well as possible future directions in this field are discussed.

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“…APAP degradation was achieved under different pH conditions, and the k ap value and degradation rate were the highest under neutral conditions (Figures S12 and S13). This is due to the loss of Mo metal ions in acidic and alkaline solutions resulting in reduced catalyst activity. , These results showed that this HFLRs degraded APAP well at pH = 7. In the process of the reaction, there is no diaphragm between the anode and cathode.…”

Section: Resultsmentioning

confidence: 78%

Mo-Based Heterogeneous Interface and Sulfur Vacancy Synergistic Effect Enhances the Fenton-like Catalytic Performance for Organic Pollutant Degradation

Zhang

et al. 2022

ACS Appl. Mater. Interfaces

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Heterogeneous Fenton-like reactions (HFLRs) based on the in situ electrochemical generation of hydrogen peroxide (H 2 O 2 ) are one of the green methods to remediate organic pollutants in wastewater. However, the design of Fenton-like catalysts with specific active sites and high pollutant degradation rate is still challenging. Here, MoS 2 −MoC and MoS 2 −Mo 2 N catalytic cathodes with heterojunctions were successfully prepared, and the mechanism by which hydroxyl radicals and singlet oxygen ( 1 O 2 ) were generated cleanly without adding chemical additives other than oxygen was clarified. The composite catalysts contained more sulfur vacancies, and the catalytic cathode achieved a high paracetamol pollutant degradation efficiency with 0.17 kWh g −1 TOC specific energy consumption. And almost 5 times higher activity was achieved compared to a pure MoS 2 catalytic cathode. Experimental studies confirmed that the production of 1 O 2 was based on the transformation of superoxide radicals by Mo 6+ , and 1 O 2 accounted for approximately 66% of the total degradation and enhanced the nonradical behavior in the reaction. This work provides a sustainable strategy for pollutant utilization, which is valuable for solving the difficult problems of HFLRs and developing new environmental remediation technologies.

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Interaction mechanism between multi-layered MoS2 and H2O2 for self-generation of reactive oxygen species

Cited by 48 publications

References 43 publications

Lysozyme-Functionalized 5-Methyl-2-thiouracil Gold/Silver Nanoclusters for Luminescence Assay of Alkaline Phosphatase

Lysozyme-Functionalized 5-Methyl-2-thiouracil Gold/Silver Nanoclusters for Luminescence Assay of Alkaline Phosphatase

Using MoS₂ Nanomaterials to Generate or Remove Reactive Oxygen Species: A Review

Mo-Based Heterogeneous Interface and Sulfur Vacancy Synergistic Effect Enhances the Fenton-like Catalytic Performance for Organic Pollutant Degradation

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Interaction mechanism between multi-layered MoS2 and H2O2 for self-generation of reactive oxygen species

Cited by 48 publications

References 43 publications

Lysozyme-Functionalized 5-Methyl-2-thiouracil Gold/Silver Nanoclusters for Luminescence Assay of Alkaline Phosphatase

Lysozyme-Functionalized 5-Methyl-2-thiouracil Gold/Silver Nanoclusters for Luminescence Assay of Alkaline Phosphatase

Using MoS2 Nanomaterials to Generate or Remove Reactive Oxygen Species: A Review

Mo-Based Heterogeneous Interface and Sulfur Vacancy Synergistic Effect Enhances the Fenton-like Catalytic Performance for Organic Pollutant Degradation

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Product

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Using MoS₂ Nanomaterials to Generate or Remove Reactive Oxygen Species: A Review