Promoted oxygen activation of layered micro-mesoporous structured titanium phosphate nanoplates by coupling nano-sized δ-MnO2 with surface pits for efficient photocatalytic oxidation of CO

Liu, Yanduo; Zhang, Xinjia; Bian, Ji; Sun, Jiawen; Li, Zhijun; Khan, Imran Mahmood; Qu, Yang; Li, Zhibin; Jiang, Zishi; Jing, Liqiang

doi:10.1016/j.apcatb.2019.05.004

Cited by 39 publications

(13 citation statements)

References 45 publications

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“…Then the superoxide anions can react with the CO adsorbed on Pd NPs or even directly with the CO + species activated by the holes remaining in the valence band of the oxide. [ 33 ] A similar photothermocatalytic effect has been previously reported also for the oxidation of benzene operated by TiO 2 /CeO 2 nanocomposite. [ 34 ] In that case, however, the improved catalytic performance was traced back to a synergistic combination of photocatalytic effect on TiO 2 , which provided activated oxygen species and thermocatalysis on CeO 2, which under irradiation enhanced its reducibility, and therefore it was localized specifically at the interface between the two oxides.…”

Section: Resultssupporting

confidence: 73%

Ce Doping Boosts the Thermo‐ and Photocatalytic Oxidation of CO at Low Temperature in TiZrO₄ Solid Solutions

Tang

Livraghi

Giamello

et al. 2021

Adv Materials Inter

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Palladium nanoparticles supported on zirconium titanate with cerium doping up to 10% molar (Ce‐ZT) are prepared by a facile impregnation method and characterized by several techniques. Due to electronic effects, the amount of Ce cations in a reduced oxidation state, i.e., Ce(III), is surprisingly high, more than 50% of the total cerium amount. The Pd decorated Ce‐ZT nanoparticles exhibit excellent catalytic activity in the low temperature oxidation of CO. The amount of Pd and Ce concentration results to be the key parameters controlling the catalytic performance. The best activity is observed in the sample with the highest Ce doping (10% molar) and a nominal Pd loading of 2% w/w, which exhibits an outstanding turnover frequency of 0.1 s−1 at 45 °C. Moreover, the CO conversion remains unchanged at 100% for 24 h at 50 °C, or for several successive light‐off experiments up to 120 °C, demonstrating excellent long‐term stability. Light irradiation is shown to further improve the catalytic performance allowing to reach the same catalytic activity of dark conditions at a temperature that is 20–40 °C lower. Electron paramagnetic resonance spectroscopy experiments indicate that Pd nanoparticles and Ce(III) ions can trap electrons favoring charge separation and formation of superoxide species, therefore enabling photocatalysis.

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Section: Resultssupporting

confidence: 73%

Ce Doping Boosts the Thermo‐ and Photocatalytic Oxidation of CO at Low Temperature in TiZrO₄ Solid Solutions

Tang

Livraghi

Giamello

et al. 2021

Adv Materials Inter

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show abstract

“…In addition, various styles of self-assembled photocatalyst nanostructures were synthesized, such as one-dimensional nanotubes 23 , two-dimensional layered structure 24,25 , three-dimensional network structure 26 , three-dimensional flower-like structure 27 and etc.MnO 2 has some advantages including low cost, high stability and environmental friendliness. Besieds, its narrow band gap can increase the utilization of visible light, which is very promising as a photocatalyst [28][29][30][31][32] . The layered structure of δ-MnO 2 is formed by the MnO 6 octahedral layer with shared edges, and there are some cations and H 2 O molecules between the layers to maintain the charge balance 33 .…”

mentioning

confidence: 99%

“…MnO 2 has some advantages including low cost, high stability and environmental friendliness. Besieds, its narrow band gap can increase the utilization of visible light, which is very promising as a photocatalyst [28][29][30][31][32] . The layered structure of δ-MnO 2 is formed by the MnO 6 octahedral layer with shared edges, and there are some cations and H 2 O molecules between the layers to maintain the charge balance 33 .…”

mentioning

confidence: 99%

Fabrication of hollow flower-like magnetic Fe3O4/C/MnO2/C3N4 composite with enhanced photocatalytic activity

Yang

Chen

et al. 2021

Sci Rep

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The serious problems of environmental pollution and energy shortage have pushed the green economy photocatalysis technology to the forefront of research. Therefore, the development of an efficient and environmentally friendly photocatalyst has become a hotpot. In this work, magnetic Fe3O4/C/MnO2/C3N4 composite as photocatalyst was synthesized by combining in situ coating with low-temperature reassembling of CN precursors. Morphology and structure characterization showed that the composite photocatalyst has a hollow core–shell flower-like structure. In the composite, the magnetic Fe3O4 core was convenient for magnetic separation and recovery. The introduction of conductive C layer could avoid recombining photo-generated electrons and holes effectively. Ultra-thin g-C3N4 layer could fully contact with coupled semiconductor. A Z-type heterojunction between g-C3N4 and flower-like MnO2 was constructed to improve photocatalytic performance. Under the simulated visible light, 15 wt% photocatalyst exhibited 94.11% degradation efficiency in 140 min for degrading methyl orange and good recyclability in the cycle experiment.

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“…The as‐prepared 2D birnessite‐type MnO 2 nanosheets with irregular surface pits exhibited excellent catalytic performance for the oxidation of formaldehyde, which can be attributed to the larger specific surface areas, as well as unsaturated manganese and oxygen atoms caused by the formation of surface pits. In addition, δ‐MnO 2 with surface pits has also been synthesized using the efficient photocatalytic oxidation of CO [ 87 ] and propane deep oxidation. [ 88 ]…”

Section: Modification Of Mno2 Single Species Nanomaterialsmentioning

confidence: 99%

“…MnO 2 with various crystal phases (α‐MnO 2 , [ 505 ] β‐MnO 2 , [ 506 ] γ‐MnO 2 , [ 159 ] and ε‐MnO 2 [ 507 ] ) has shown excellent performances for CO oxidation. Among them, α‐MnO 2 has relatively higher catalytic activity for CO oxidation than other crystalline phases, [ 67 ] while δ‐MnO 2 shows a better‐assisted function for the photocatalytic oxidation of CO [ 87 ] (assist layered micro‐mesoporous titanium phosphates to photocatalytic oxidize CO).…”

Section: Environmental Applicationsmentioning

confidence: 99%

MnO₂‐Based Materials for Environmental Applications

et al. 2021

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Manganese dioxide (MnO2) is a promising photo–thermo–electric‐responsive semiconductor material for environmental applications, owing to its various favorable properties. However, the unsatisfactory environmental purification efficiency of this material has limited its further applications. Fortunately, in the last few years, significant efforts have been undertaken for improving the environmental purification efficiency of this material and understanding its underlying mechanism. Here, the aim is to summarize the recent experimental and computational research progress in the modification of MnO2 single species by morphology control, structure construction, facet engineering, and element doping. Moreover, the design and fabrication of MnO2‐based composites via the construction of homojunctions and MnO2/semiconductor/conductor binary/ternary heterojunctions is discussed. Their applications in environmental purification systems, either as an adsorbent material for removing heavy metals, dyes, and microwave (MW) pollution, or as a thermal catalyst, photocatalyst, and electrocatalyst for the degradation of pollutants (water and gas, organic and inorganic) are also highlighted. Finally, the research gaps are summarized and a perspective on the challenges and the direction of future research in nanostructured MnO2‐based materials in the field of environmental applications is presented. Therefore, basic guidance for rational design and fabrication of high‐efficiency MnO2‐based materials for comprehensive environmental applications is provided.

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Promoted oxygen activation of layered micro-mesoporous structured titanium phosphate nanoplates by coupling nano-sized δ-MnO2 with surface pits for efficient photocatalytic oxidation of CO

Cited by 39 publications

References 45 publications

Ce Doping Boosts the Thermo‐ and Photocatalytic Oxidation of CO at Low Temperature in TiZrO₄ Solid Solutions

Ce Doping Boosts the Thermo‐ and Photocatalytic Oxidation of CO at Low Temperature in TiZrO₄ Solid Solutions

Fabrication of hollow flower-like magnetic Fe3O4/C/MnO2/C3N4 composite with enhanced photocatalytic activity

MnO₂‐Based Materials for Environmental Applications

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Promoted oxygen activation of layered micro-mesoporous structured titanium phosphate nanoplates by coupling nano-sized δ-MnO2 with surface pits for efficient photocatalytic oxidation of CO

Cited by 39 publications

References 45 publications

Ce Doping Boosts the Thermo‐ and Photocatalytic Oxidation of CO at Low Temperature in TiZrO4 Solid Solutions

Ce Doping Boosts the Thermo‐ and Photocatalytic Oxidation of CO at Low Temperature in TiZrO4 Solid Solutions

Fabrication of hollow flower-like magnetic Fe3O4/C/MnO2/C3N4 composite with enhanced photocatalytic activity

MnO2‐Based Materials for Environmental Applications

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Ce Doping Boosts the Thermo‐ and Photocatalytic Oxidation of CO at Low Temperature in TiZrO₄ Solid Solutions

Ce Doping Boosts the Thermo‐ and Photocatalytic Oxidation of CO at Low Temperature in TiZrO₄ Solid Solutions

MnO₂‐Based Materials for Environmental Applications