Graphite assisted room-temperature synthesis of structurally defected OMS-2 nanorods for peroxymonosulfate activation

Li, Xiaoxia; Zou, Qiancheng; Yi, Wei; Zhou, Xiaochuan; Wang, Zeyu; Xu, Aihua; Ruan, Xinchao

doi:10.1016/j.apsusc.2019.143770

Cited by 19 publications

(3 citation statements)

References 49 publications

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“…50 In the XPS high-resolution spectra of O 1s (Figure S6b), the signals at 530.6, 531.2, 531.7, and 532.7 eV are attributed to the lattice oxygen (O L ), oxygen vacancy (O V ), surface hydroxyl species (O OH ), and adsorbed H 2 O (O H2O ), respectively. 51,52 Consequently, the element species of Mo 5+/6+ , Pd 2+ , Pd 0 , and O 2− are determined in A-Pd@MoO 3−x NH, constructing the main component of Pd@MoO 3−x .…”

Section: ■ Introductionmentioning

confidence: 99%

Dual Active Centers Linked by a Reversible Electron Station as a Multifunctional Nanozyme to Induce Synergetically Enhanced Cascade Catalysis for Tumor-Specific Therapy

et al. 2023

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Nanozymes have shown great promise in reactive oxygen species (ROS)-mediated tumor therapy with mitigated side effects but are normally limited by the complex tumor microenvironment (TME). Herein, to overcome the adverse effects of TME, such as tumor hypoxia and high endogenous glutathione (GSH), an aptamer-functionalized Pd@MoO3–x nano-hydrangea (A-Pd@MoO3–x NH) is constructed for high-efficiency cancer therapy. Utilizing the irregular shape characteristics of nano Pd, the A-Pd@MoO3–x NH nanozyme simultaneously exposes catalase-like Pd(111) and oxidase-like Pd(100) surface facets as dual active centers. This can catalyze cascade enzymatic reactions to overcome the negative effects of tumor hypoxia caused by the accumulation of cytotoxic superoxide (O2 •–) radicals in TME without any external stimuli. In addition, the nanozyme can effectively degrade the overexpressed glutathione (GSH) through the redox reaction to avoid nontherapeutic consumption of O2 •– radicals. More significantly, as a reversible electron station, MoO3–x can extract electrons from H2O2 decomposing on Pd(111) or GSH degradation and transfer them back to Pd(100) through oxygen bridges or few Mo–Pd bonds. This can synergistically enhance enzyme-like activities of dual active centers and the GSH-degrading ability to enrich O2 •– radicals. In this way, the A-Pd@MoO3–x NH nanozyme can selectively and remarkably kill tumor cells while keeping the normal cell line unharmed.

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Section: ■ Introductionmentioning

confidence: 99%

Dual Active Centers Linked by a Reversible Electron Station as a Multifunctional Nanozyme to Induce Synergetically Enhanced Cascade Catalysis for Tumor-Specific Therapy

et al. 2023

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“…The ∆E s splitting originates from the exchange coupling between the 3s hole and the 3d electrons of Mn, and depends on the spin multiplicity (2S + 1) of the given 3d n configuration (the peak at a lower energy corresponds to the parallel spin alignment, whereas the peak at a higher energy to the anti-parallel one). The lower the oxidation state of the Mn ions, the larger the splitting between the main 3s band and the satellite peak, which is accounted for by the simple empirical formula [49]:…”

Section: Chemical Composition and Manganese Redox State Analysismentioning

confidence: 99%

Soot Combustion over Niobium-Doped Cryptomelane (K-OMS-2) Nanorods—Redox State of Manganese and the Lattice Strain Control the Catalysts Performance

et al. 2020

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A series of Nb-doped (0–23 wt%) cryptomelane catalyst (Nb-K-OMS-2) was synthesized and thoroughly characterized by XRD, TEM/EDX, XRF, XPS, XAS, UV-Vis, and Raman techniques corroborated by the work function measurements. The obtained catalysts were tested for soot oxidation (Printex U) in model tight and loose contact modes. It was shown that the catalytic properties of the Nb-K-OMS-2 are controlled by the amount of Nb dopant in a strongly non-monotonous way. The introduction of niobium gives rise to the strain in the cryptomelane lattice, accompanied by significant Mn+3/Mn+4 ratio variations and concomitant work function changes. The isotopic exchange experiments revealed that the catalytic activity of the Nb-OMS-2 catalysts in soot combustion proceeds via the pathways, where both the activated suprafacial 18O and the surface 16O2− species participate together in the reaction. The niobium doping level controls the non-monotonous changes of the catalyst work function and the lattice strain, and variations of these parameters correlate well with the observed deSoot activity. To our best knowledge, the role of the lattice strain of the cryptomelane catalysts was documented for the first time in this study.

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“…However, there is a lack of literature on this hybrid process. The CS B 4 C-AA7075 and aluminum coatings applied on AZ64 were employed as seed surfaces and subjected to PEO treatment to create the corresponding duplex coatings [23][24][25]. Microstructure, mechanical characteristics, and phase composition of two CS + PEO duplex coatings were analyzed, as their resistance to wear, corrosion, and abrasion [26,27].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Mechanical Behavior and Surface Characteristics of Cold Spray Metallized B4C/AA7075 Composites Coated by AZ64 Alloy through Plasma Electrolytic Oxidation

Thunaipragasam

Kolekar²,

Chandrashekhar³

et al. 2023

Journal of Nanomaterials

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Metallized cold-spray coatings were employed to make B4C/AA7075 and aluminum + plasma electrolytic oxidation (PEO) duplex coatings on AZ64. In addition, the phase structure, mechanical characteristics, wear, and PEO ceramic coatings examine the corrosion resistance. According to the findings, the PEO ceramic coating comprises α-aluminum oxide and γ-aluminum oxide, with some remnants of B4C still being preserved. PEO ceramic coatings outperformed their corresponding CS counterparts regarding mechanical characteristics and wear resistance. For example, the PEO-B4C coating achieved a hardness of 13.8 GPa and an elastic modulus of 185.5 GPa, which were 21.0% and 23.5%, respectively, more significant than the comparable values for the coating with CS. The PEO-B4C coating was 58% and 15.7% less abrasive than the equivalent CS coating due to its lower wear rate of 4.84 × 10−5 mm3/Nm and relatively lower of 0.64. The density of corrosion current in the PEO-treated B4C-AA7075 coating (3.735 × 106 A/cm2) is similar to the corrosion current density in the untreated CS coatings. Finally, compared to untreated CS B4C-AA7075, the coating’s mechanical characteristics and wear resistance are considerably enhanced by the PEO treatment.

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Graphite assisted room-temperature synthesis of structurally defected OMS-2 nanorods for peroxymonosulfate activation

Cited by 19 publications

References 49 publications

Dual Active Centers Linked by a Reversible Electron Station as a Multifunctional Nanozyme to Induce Synergetically Enhanced Cascade Catalysis for Tumor-Specific Therapy

Dual Active Centers Linked by a Reversible Electron Station as a Multifunctional Nanozyme to Induce Synergetically Enhanced Cascade Catalysis for Tumor-Specific Therapy

Soot Combustion over Niobium-Doped Cryptomelane (K-OMS-2) Nanorods—Redox State of Manganese and the Lattice Strain Control the Catalysts Performance

Investigation of Mechanical Behavior and Surface Characteristics of Cold Spray Metallized B4C/AA7075 Composites Coated by AZ64 Alloy through Plasma Electrolytic Oxidation

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