Tuning of MgO nanoparticles on Ag dopant additions for charge storage applications

Kant, Ravi; Singh, Ashish Kumar; Arora, Arpit

doi:10.1016/j.vacuum.2021.110247

Cited by 28 publications

(7 citation statements)

References 22 publications

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“…This phenomenon was also reported by other investigators [9,15,25]. Presence of Ag peaks in Ag-doped MgO NPs is due to the fact that the ionic radii of Ag + (0.126 nm) is larger than the ionic radii of Mg (0.066 nm) [26,27]. Further, the crystallite size (D) of prepared samples was calculated by Scherrer's equation, which is given by Equation (2) [28].…”

Section: X-ray Diffraction (Xrd) Analysissupporting

confidence: 74%

“…The observed peaks in the spectra of pure MgO NPs and Ag-doped MgO NPs are located at 860 cm −1 , 1450 cm −1 , 1080 cm −1 , 1634 cm −1 , 3420 cm −1 , and 3704 cm −1 . The peaks between 431 cm −1 to 1080 cm −1 can be assigned to Mg-O stretching vibrations [26]. The peaks at 2920 cm −1 and 2010 cm −1 demonstrate C=O bond because of symmetry and asymmetry vibrations, respectively [42].…”

Section: Fourier-transform Infrared (Ftir) Analysismentioning

confidence: 99%

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Facile Synthesis, Characterization, Photocatalytic Activity, and Cytotoxicity of Ag-Doped MgO Nanoparticles

et al. 2021

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Due to unique physicochemical properties, magnesium oxide nanoparticles (MgO NPs) have shown great potential for various applications, including biomedical and environmental remediation. Moreover, the physiochemical properties of MgO NPs can be tailored by metal ion doping that can be utilized in photocatalytic performance and in the biomedical field. There is limited study on the photocatalytic activity and biocompatibility of silver (Ag)-doped MgO NPs. This study was planned for facile synthesis, characterization, and photocatalytic activity of pure and silver (Ag)-doped MgO NPs. In addition, cytotoxicity of pure and Ag-doped MgO NPs was assessed in human normal umbilical vein endothelial cells (HUVECs). Pure MgO NPs and Ag-doped (1, 2, 5, and 7.5 mol%) MgO NPs were prepared via a simple sol-gel procedure. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FTIR), photoluminescence (PL), and X-ray photoelectron spectroscopy (XPS) were used to characterize the prepared samples. XRD results showed the preparation of highly crystalline NPs with no impurity peaks. TEM and SEM studies indicate smooth surfaces with almost spherical morphology of MgO NPs, and Ag-doping did not change the morphology. Elemental composition study suggested that Ag is uniformly distributed in MgO particles. Intensity of the PL spectra of MgO NPs decreased with increasing the concentration of Ag dopants. In comparison to pure MgO NPs, Ag-MgO NPs showed higher degradation of methylene blue (MB) dye under UV irradiation. The improved photocatalytic activity of Ag-MgO NPs was related to the effect of dopant concentration on reducing the recombination between electrons and holes. Cytotoxicity studies showed good biocompatibility of pure and Ag-doped MgO NPs with human normal umbilical vein endothelial cells (HUVECs). These results highlighted the potential of Ag-doped MgO NPs in environmental remediation.

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Section: X-ray Diffraction (Xrd) Analysissupporting

confidence: 74%

Section: Fourier-transform Infrared (Ftir) Analysismentioning

confidence: 99%

Facile Synthesis, Characterization, Photocatalytic Activity, and Cytotoxicity of Ag-Doped MgO Nanoparticles

et al. 2021

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“…This behavior is probably related to the amount of Mn present in MgO. The vibration frequency at 859 cm –1 is characteristic of the cubic phase of MgO. , The bands at 1428 and 1482 cm –1 are assigned to the stretching vibration of the carbonate anion (for example, CO), manifesting the presence of chemisorbed atmospheric CO 2 due to the acidic–basic properties of the surfaces of these materials. ,, The absorbance bands located at 1631 cm –1 and 3436 cm –1 indicate the existence of −OH stretching and bending vibrations from adsorbed H 2 O molecules from air. , The last band at 3693 cm –1 belongs to the −OH stretching vibration mode of hydroxyl groups. , …”

Section: Results and Discussionmentioning

confidence: 99%

Designing of 3D Architecture Flower-like Mn-Promoted MgO and Its Application for CO₂ Adsorption and CO₂-Assisted Aerobic Oxidation of Alkylbenzenes

Jean-Louis

Ravi

Tillous

et al. 2023

ACS Appl. Mater. Interfaces

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Sustainable chemistry research prioritizes reducing atmospheric carbon dioxide, and one logical solution is to develop adsorbents suitable for carbon capture and utilization. In this work, a new family of three-dimensional (3D) flower-like Mn-promoted MgO was synthesized by the coprecipitation method and used as an adsorbent for CO2 capture and a catalyst for CO2 utilization. The scanning electron microscopy (SEM) analysis of the samples shows a 3D architecture composed of thin nanosheets. The X-ray diffraction (XRD) analysis confirms the presence of the MgO with a cubic structure, while X-ray photoelectron spectroscopy (XPS) reveals the existence of Mn particles as a combination of Mn3+ and Mn4+ ions on MgO. N2 adsorption–desorption experiments highlight the beneficial contribution of Mn particles to surface area enhancement and reveal the existence of mesopores. Furthermore, the designed 3D Mn-doped MgO as an adsorbent demonstrates its capability to improve the ability of MgO to adsorb CO2 (from 0.28 mmol/g for pure MgO to 0.74 mmol/g) in ambient conditions and it is regenerable up to 9 cycles with a slight variation after the third cycle. Moreover, Mn-doped MgO shows good catalyst activity for the oxidation of ethylbenzene derivatives to carbonyl compounds in the presence of CO2 and O2. Mn-15/MgO shows excellent catalytic behavior with a conversion of 97.4 and 100% selectivity. Also, it is regenerable with an insignificant decrease in conversion (∼11.63%) after seven cycles, while the selectivity of acetophenone remains stable. The analyses of the recycled sample suggest that the chemical compositions of Mn and Mg influence the catalytic activity of those Mn-promoted MgO materials. The role of CO2 gas in the aerobic oxidation of ethylbenzene to acetophenone has also been proved. Finally, the control experiments and EPR studies reveal that the reaction takes place through the formation of radicals.

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“…28,29 The defects are in turn an additional degree of freedom, which can collect electrons from the natural charge transfer between the MgO thin-film surface and the Ag interface 20 and within Agdoped MgO nanoparticles. 30 Accordingly, the shifts of the charge carriers with respect to the Fermi level may be related to presence of defects at the MgO thin-films, 27 which display different properties still not completely understood. 31 Defects can be formed either spontaneously during the growth process (magnesium deposition under an oxygen background pressure) or intentionally by bombarding the surface with electrons.…”

Section: Introductionmentioning

confidence: 99%

CO adsorption on MgO thin-films: formation and interaction of surface charged defects

da Silva Alvim,

Borges Jr.,

Alves

et al. 2023

Phys. Chem. Chem. Phys.

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Tuning of MgO nanoparticles on Ag dopant additions for charge storage applications

Cited by 28 publications

References 22 publications

Facile Synthesis, Characterization, Photocatalytic Activity, and Cytotoxicity of Ag-Doped MgO Nanoparticles

Facile Synthesis, Characterization, Photocatalytic Activity, and Cytotoxicity of Ag-Doped MgO Nanoparticles

Designing of 3D Architecture Flower-like Mn-Promoted MgO and Its Application for CO₂ Adsorption and CO₂-Assisted Aerobic Oxidation of Alkylbenzenes

CO adsorption on MgO thin-films: formation and interaction of surface charged defects

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Tuning of MgO nanoparticles on Ag dopant additions for charge storage applications

Cited by 28 publications

References 22 publications

Facile Synthesis, Characterization, Photocatalytic Activity, and Cytotoxicity of Ag-Doped MgO Nanoparticles

Facile Synthesis, Characterization, Photocatalytic Activity, and Cytotoxicity of Ag-Doped MgO Nanoparticles

Designing of 3D Architecture Flower-like Mn-Promoted MgO and Its Application for CO2 Adsorption and CO2-Assisted Aerobic Oxidation of Alkylbenzenes

CO adsorption on MgO thin-films: formation and interaction of surface charged defects

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Designing of 3D Architecture Flower-like Mn-Promoted MgO and Its Application for CO₂ Adsorption and CO₂-Assisted Aerobic Oxidation of Alkylbenzenes