Recent progresses in the synthesis of MnO<sub>2</sub> nanowire and its application in environmental catalysis

Song, Huikang; Xu, Leilei; Chen, Mindong; Cui, Yan; Wu, Caie; Qiu, Jian; Xu, Liang; Cheng, Ge; Hu, Xun

doi:10.1039/d1ra06497e

Cited by 29 publications

(10 citation statements)

References 201 publications

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“…In addition, the binding energy peak at about 685 eV is attributed to the F 1s binding energy of Ti-O-F formed when F interstitially enters the Ti-O lattice. This is consistent with the results reported in the literature [31,32].…”

Section: Electronic Interaction Of Synthesized Materialssupporting

confidence: 94%

Characteristics of Doped TiO2 Nanoparticle Photocatalysts Prepared by the Rotten Egg White

Sharma

Lin

et al. 2022

Materials

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In this study, expired egg white was used as a template, and a sol–gel method was employed to prepare pure-phase TiO2 nano-powder and mixed-phase powders doped with NaF and NaI. The influences of different calcination temperatures, doping elements, and doping amounts during the preparation process on the photocatalytic performance and activity of the prepared TiO2 powders were studied. The results of the experiments showed that the F-doped TiO2 had the highest photocatalytic activity when the doping amount was 1.2%, as examined by EDS, where the sintering temperature was 500 °C. F-doped TiO2 nanoparticles were also synthesized by the sol–gel method using tetrabutyl titanate and NaF mixed with expired egg white protein as the precursor. The F-TiO2 photocatalyst was characterized using FE-SEM, HR-TEM, EDS, XPS, and UV-Vis, and the photocatalytic activity was evaluated by photodegradation of methylene blue under visible light. The results showed that doping with F reduced the energy band gap (3.04 eV) of TiO2, thereby increasing the photocatalytic activity in the visible-light region. The visible-light wavelength range and photocatalytic activity of the catalyst were also affected by the doping amount.

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Section: Electronic Interaction Of Synthesized Materialssupporting

confidence: 94%

Characteristics of Doped TiO2 Nanoparticle Photocatalysts Prepared by the Rotten Egg White

Sharma

Lin

et al. 2022

Materials

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“…MnO 2 is one of the most appealing materials because of its technological significance and potential applications in various catalytic and electrochemical processes where their properties are significantly influenced by its structure and morphology, allowing researchers to investigate the effect of the support structure on catalytic activity [13]. Different catalytic activity can be caused by the phase structure, catalyst surface, crystal facets with various surface atom configurations, metal loading and doping, and different physicochemical parameters [14,15]. Furthermore, MnO 2 is an n-type semiconductor with oxidative catalytic [16] properties that depend upon its crystallographic forms.…”

Section: Introductionmentioning

confidence: 99%

α-MnO2 Nanowire Structure Obtained at Low Temperature with Aspects in Environmental Remediation and Sustainable Energy Applications

et al. 2022

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Hydrothermally obtained α-MnO2 nanowire characterizations confirm the tetragonal crystalline structure that is several micrometers long and 20–30 nm in diameter with narrow distributions in their dimensions. The absorption calculated from diffuse reflectance of α-MnO2 occurred in the visible region ranging from 400 to 550 nm. The calculated band gap with Quantum Espresso using HSE approximation is ~2.4 eV for the ferromagnetic case, with a slightly larger gap of 2.7 eV for the antiferromagnetic case, which is blue-shifted as compared to the experimental. The current work also illustrates the transformations that occur in the material under heat treatment during TGA analysis, with the underlying mechanism. Electrochemical studies on graphite supports modified with α-MnO2 compositions revealed the modified electrode with the highest electric double-layer capacitance of 3.444 mF cm−2. The degradation rate of an organic dye—rhodamine B (RhB)—over the compound in an acidic medium was used to examine the catalytic and photocatalytic activities of α-MnO2. The peak shape changes in the time-dependent visible spectra of RhB during the photocatalytic reaction were more complex and progressive. In two hours, RhB degradation reached 97% under sun irradiation and 74% in the dark.

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“…Different morphologies including nanowires, nanorods, nanoflakes, and nanoflowers have been synthesized. Compared to conventional bulk MnO 2 , nanostructured MnO 2 materials typically have better physicochemical properties such as high specific surface area, lower density, and tunable chemical properties . The membrane catalytic reactor is a novel process of using membranes in catalytic reactions. , The catalyst load on the membrane surface could provide an abundance of catalytic sites, and the membrane could also provide separation, dispersion, and other functions.…”

Section: Introductionmentioning

confidence: 99%

MnO₂-Functionalized Hydrophobic Ceramic Membrane for Sulfite Oxidation

Meng

Liu

et al. 2023

ACS Appl. Nano Mater.

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Catalytic oxidation of sulfite is critical for the fixation of sulfite in the flue gas desulfurization process and is also an essential step related to the treatment of air and water pollution. This work designed and prepared a nano-MnO 2 -functionalized hydrophobic ceramic membrane with a hydrophobic surface by a hydrothermal method. The chemical composition and the nanostructure of the prepared MnO 2 composite membranes were characterized using several identification techniques (X-ray diffraction, Fourier-transform infrared spectroscopy, Raman spectroscopy, scanning electron microscopy, and X-ray photoelectron spectroscopy). The results show that the prepared nano-MnO 2 was sea urchin-like, the crystal form was β-MnO 2 , and it grows uniformly on the surface of the ceramic membrane. The molar ratios of Mn 4+ /Mn 3+ and O latt /O total were associated with high catalytic activity and enhanced with increasing preparation concentration. The catalytic ability of nano-MnO 2 composite membranes to Na 2 SO 3 was studied by the membrane dispersion-catalysis process. The catalytic efficiency with a loaded amount of 1.6−4.5 mg was 5.4−8.3 times higher than that without the catalyst. The free radical quenching experiment showed that SO 5•− was identified as the key free radical in the chain reaction. The oxidation kinetics of sulfite were investigated using a membrane dispersion reactor. The results showed that the catalyst, sulfite, and oxygen partial pressure reaction orders were 0.411, 0.243, and 0.640, respectively, and showed an apparent activation energy of 1.89 kJ•mol −1 . Based on the three-phase reaction model analysis, sulfite oxidation was considered to be controlled by the mass transfer process of oxygen from the gas phase to the liquid phase.

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Recent progresses in the synthesis of MnO₂ nanowire and its application in environmental catalysis

Abstract: This review summarizes the synthesis strategies for MnO2 nanowire and the influences of the phase structure, crystal facet, metal doping, and interface effect on its performance in various environmental catalysis processes.

Cited by 29 publications

References 201 publications

Characteristics of Doped TiO2 Nanoparticle Photocatalysts Prepared by the Rotten Egg White

Characteristics of Doped TiO2 Nanoparticle Photocatalysts Prepared by the Rotten Egg White

α-MnO2 Nanowire Structure Obtained at Low Temperature with Aspects in Environmental Remediation and Sustainable Energy Applications

MnO₂-Functionalized Hydrophobic Ceramic Membrane for Sulfite Oxidation

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Recent progresses in the synthesis of MnO2 nanowire and its application in environmental catalysis

Abstract: This review summarizes the synthesis strategies for MnO2 nanowire and the influences of the phase structure, crystal facet, metal doping, and interface effect on its performance in various environmental catalysis processes.

Cited by 29 publications

References 201 publications

Characteristics of Doped TiO2 Nanoparticle Photocatalysts Prepared by the Rotten Egg White

Characteristics of Doped TiO2 Nanoparticle Photocatalysts Prepared by the Rotten Egg White

α-MnO2 Nanowire Structure Obtained at Low Temperature with Aspects in Environmental Remediation and Sustainable Energy Applications

MnO2-Functionalized Hydrophobic Ceramic Membrane for Sulfite Oxidation

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Product

Resources

About

Recent progresses in the synthesis of MnO₂ nanowire and its application in environmental catalysis

MnO₂-Functionalized Hydrophobic Ceramic Membrane for Sulfite Oxidation