Facile preparation of anodized MoO3−x films and their boosted photocatalytic activity

Zhang, Yan; Ping, Xuecheng; Líu, Hao; He, Yiqiang; Guo, Yongkang; Zhao, Qian; Zheng, Zhaoqi; Lu, Yun

doi:10.1016/j.jece.2021.105565

Cited by 10 publications

(9 citation statements)

References 62 publications

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“…In the Raman spectra (Figure d), there is a distinct Pd–O characteristic peak in Pd@MoO 3– x NPs at 630 cm –1 , which is quite consistent with the FTIR results above. Specifically, the peaks at 270 and 820 cm –1 are ascribed to the O–Mo–O bending mode and the doubly coordinated oxygen (Mo 2 –O) stretching mode, respectively . Obviously, the peak of the terminal oxygen (MoO) stretching mode at 994 cm –1 in MoO 3– x decreases to 898 cm –1 in Pd@MoO 3– x NPs due to the strain relaxation of MoO 3– x generated by MoO 3– x covering Pd NPs .…”

Section: Results and Discussionmentioning

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: Results and Discussionmentioning

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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“…All of Mo 3d XPS spectra can deconvolved into two strong peaks at binding energies around 232.8–233.2 and 235.9–236.3 eV and two weak peaks at binding energies around 231.7–231.8 and 235.2–235.4 eV (Figure 3a–c). The binding energies at 232.8–233.2 and 235.9–236.3 eV correspond to Mo 6+ 3d 5/2 and Mo 6+ 3d 3/2 , respectively, [ 27,28 ] and the binding energies at 231.7–231.8 and 235.2–235.4 eV are associated with Mo 5+ 3d 5/2 and Mo 5+ 3d 3/2 , respectively. [ 29,30 ] These results confirmed the presence of Mo 6+ oxidation state related to MoO 3 and Mo 5+ species in the oxygen deficient status on MoO 3 − x sample, and the atom percentage of Mo 6+ (96.8%–97.4%) is much higher than that of Mo 5+ (2.6%–3.2%, Table 1).…”

Section: Resultsmentioning

confidence: 99%

“…The former should be attributed to chemisorbed and dissociated oxygen species on the surface (denoted as O sur. ), [ 27 ] and the latter could be ascribed to lattice oxygen species (denoted as O lat. ).…”

Section: Resultsmentioning

confidence: 99%

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Molybdenum oxides catalyzed the N,N‐dimethylamination of alcohols with N,N‐dimethylformamide for direct synthesis of tertiary amines

Zhou

Liu

Zhang

et al. 2023

Applied Organom Chemis

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Molybdenum oxides (MoO3 − x, x = 1, 2, and 3) with three types of morphologies were prepared and applied to the reaction of benzyl alcohol with dimethylformamide (DMF) for synthesis of tertiary amines. The MoO3 − 1 catalyst prepared by direct calcination exhibited high activity and tertiary amines selectivity in the N,N‐dimethylamination of benzyl alcohol under the reaction conditions at 150°C for 12 h using DMF as a methylating agent and solvent, as compared to MoO3 − 2 and MoO3 − 3 catalysts. This feature was ascribed to the high proportion of surface chemisorbed oxygen for MoO3 − 1 sample, which can promote the adsorbed benzyl alcohol transformation into benzaldehyde. The MoO3 − 1 catalyst was also found to be reusable in five consecutive runs without a significant decrease in catalytic activity. In addition, control experiments showed two parallel reaction routes in this catalytic system. One route is the reaction of benzaldehyde intermediate and DMF to form tertiary amines (Route I); the other route is that benzyl formate intermediate reacted with DMF (Route II), which has not been reported before and specifically involves the esterification of benzyl alcohol with formic acid from DMF decomposition to form benzyl formate.

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“…Due to the different preparation methods of MoO 3− x nanosheets, the detection methods of AA content based on MoO 3− x nanosheets are different. In recent years, many methods have been used to prepare MoO 3− x nanosheets, such as chemical vapor deposition (Chen et al., 2019), carbon dioxide assisted method (Ge et al., 2021), anodic oxidation (Ahmadzadeh et al., 2022; Zhang et al., 2021), laser irradiation (Li et al., 2020), and heat treatment (Li et al., 2021). Most of the methods are complicated, expensive, time‐consuming, and even risky to pollute the environment.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of MoO₃₋_x nanosheets and its application in ascorbic acid detection of fruit and vegetables

Zeng

Ruan

Che

et al. 2023

Journal of Food Science

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A new method combining ultraviolet (UV) spectrophotometry and MoO 3−x nanosheets was developed for the rapid and accurate determination of ascorbic acid (AA) content in fruit and vegetables in this study. MoO 3−x nanosheets were prepared by the liquid exfoliation method using AA as the reducing agent, and the content of AA can be determined by a UV spectrophotometer. Experimental conditions for the MoO 3−x nanosheet method, including grinding time, ethanol concentration, sonication time, and water bath temperature were also optimized.The morphology of MoO 3−x nanosheets was characterized by atomic force microscope. The results showed that the average thickness of MoO 3−x nanosheets was 2.1-5.8 nm. The MoO 3−x nanosheets method had a good linearity in the AA concentration range of 0.01-0.05 mg/ml (R 2 = 0.9996). The limit of detection was 0.031 µg/ml, and the limit of quantitation was 0.095 µg/ml. The spiked recoveries were in the range of 88.79%-116.76%. The MoO 3−x nanosheets method was validated for the determination of AA content in five different fruit and vegetables samples with relative standard deviations less than 2%.

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Facile preparation of anodized MoO3−x films and their boosted photocatalytic activity

Cited by 10 publications

References 62 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

Molybdenum oxides catalyzed the N,N‐dimethylamination of alcohols with N,N‐dimethylformamide for direct synthesis of tertiary amines

Synthesis of MoO₃₋_x nanosheets and its application in ascorbic acid detection of fruit and vegetables

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Facile preparation of anodized MoO3−x films and their boosted photocatalytic activity

Cited by 10 publications

References 62 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

Molybdenum oxides catalyzed the N,N‐dimethylamination of alcohols with N,N‐dimethylformamide for direct synthesis of tertiary amines

Synthesis of MoO3−x nanosheets and its application in ascorbic acid detection of fruit and vegetables

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Product

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Synthesis of MoO₃₋_x nanosheets and its application in ascorbic acid detection of fruit and vegetables