Modification of photocatalytic property of BaTiO3 perovskite structure by Fe2O3 nanoparticles for CO2 reduction in gas phase

Zangeneh, Nazanin Panahi; Sharifnia, Shahram; Karamian, Elham

doi:10.1007/s11356-019-07215-2

Cited by 14 publications

(6 citation statements)

References 28 publications

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“…Although hematite is usually classified as a nonfluorescent mineral, a PL component was observed at VIS excitation. Also, we did not find a specific location on the samples where hematite would be detected with the UV illumination; we speculate that this might be connected with the potential UV‐range PL above the bandgap in hematite as reported in Ref 62 6 and 10.…”

Section: Resultsmentioning

confidence: 43%

“…Also, we did not find a specific location on the samples where hematite would be detected with the UV illumination; we speculate that this might be connected with the potential UVrange PL above the bandgap in hematite as reported in Ref. 62 ; the latter spectral data were used to plot an approximate PL spectrum bar in Figures 6 and 10.…”

Section: Raman Spectra Of P-mrs Samplesmentioning

confidence: 56%

“…Several of luminescent atoms often contributing to PL are placed (most right column) at around their resonant excitation energies 14 . Data for absorption/PL are taken: for amorphous carbon—from Shang et al 59 ; for gypsum—Taga et al 60 ; for olivine—Rossman and Ehlmann 61 , for hematite—Zangeneh et al 62 …”

Section: Resultsmentioning

confidence: 99%

“…Several of luminescent atoms often contributing to PL are placed (most right column) at around their resonant excitation energies. 14 Data for absorption/PL are taken: for amorphous carbon-from Shang et al 59 ; for gypsum-Taga et al 60 ; for olivine-Rossman and Ehlmann 61 , for hematite-Zangeneh et al 62 F I G U R E 7 Examples of original (untreated) UV-VIS-NIR-IR Raman spectra taken at different locations on the S-MRS simulant samples. Photon flux Â integration time Â number of averages are @ 325 nm: 3.2Á10 15 μm À2 s À1 Â 10 s Â 10; @ 532 nm: 4.4Á10 15 μm À2 s À1 Â 1 s Â 900; @ 785 nm: 3.4Á10 16 μm À2 s À1 Â 10 s Â 10; @ 1064 nm: 3.2Á10 13 μm À2 s À1 Â 180 s Â 1.…”

Section: Raman Spectra Of S-mrs Samplesmentioning

confidence: 99%

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Comparative Raman spectroscopy of astrobiology relevant bio‐samples and planetary surface analogs under UV–VIS–IR excitation

Hanke,

Böttger,

Pohl

et al. 2023

J Raman Spectroscopy

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We investigated the potential of a laser selection in the broad optical range, from ultraviolet through visible to infrared (excitation wavelengths of 325, 532, 785, and 1064 nm) for combined analysis of Earth‐relevant extremophiles (Xanthoria elegans, Buellia frigida, and green alga of Circinaria gyrosa), carbohydrate molecules, as well as Mars and Moon surface regolith simulants as analog mineral mixtures (P‐MRS, S‐MRS, LRS, and JSC‐1). We show that the optimization of the laser photon energy provides (for at least one of the chosen excitation wavelengths) high‐end quality Raman spectra for each examined sample. In most cases, the infrared spectral range is advanced for biological samples, while an excitation in the visible and ultraviolet spectral range is often favorable or at least sufficient for accurate identification/resolution of mineral phases under the illuminated laser spot on the planetary surface simulants. Ultraviolet excitation does not always deliver significant contrast of the Raman Stokes responses to the induced photoluminescence in the studied biomolecules. Most prominent features in the Raman spectra of the biological samples are assigned to their specific pigments, also considered as biomolecular signatures of the extremophiles. The critical issue of specific advantages and limitations of each particular excitation source implies study for gaining scientific return from Raman spectroscopy for exobiological prospecting, for instance, the best trade between a single or dual excitation wavelength(s) for both biological and geological spectral data.

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Section: Resultsmentioning

confidence: 43%

Section: Raman Spectra Of P-mrs Samplesmentioning

confidence: 56%

Section: Resultsmentioning

confidence: 99%

Section: Raman Spectra Of S-mrs Samplesmentioning

confidence: 99%

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Comparative Raman spectroscopy of astrobiology relevant bio‐samples and planetary surface analogs under UV–VIS–IR excitation

Hanke,

Böttger,

Pohl

et al. 2023

J Raman Spectroscopy

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“…For example; BiFeO 3 –ZnO shows prominent ∼21% photocatalytic reduction of CO 2 compared to well known traditional photocatalysts like CuPc/TiO 2 and CuPc/ZnO showing only 15% CO 2 conversion under similar conditions of 4 h visible light irradiation; BaTiO 3 –Fe 2 O 3 shows 22% in visible light irradiation for only 60 minutes. 111–114 The nanosheets of SrBi 4 Ti 4 O 15 with the strongest ferroelectricity outperform most reported photocatalysts by showing high photocatalytic CO 2 reduction activity for CH 4 evolution at a rate of 19.8 μmol h −1 g −1 . 110 Likewise, Ag 2 CrO 4 /Ag/BiFeO 3 @RGO generates 180 μmol g −1 of CH 4 in 8 h of visible light irradiation and under alkali activation, it shows 260 μmol g −1 which is ∼60 times higher than that of bare BiFeO 3 .…”

Section: Applicationsmentioning

confidence: 94%

Underlying physics and chemistry of ferroic-photocatalysis: a critical review

et al. 2022

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Ferroelectrics in Photocatalysis

Liu

Huang

2022

Chemistry A European J

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The rapid development of industrialization and population has brought water, air-pollution and energy crises. Solar-driven catalysis is expected to relieve these issues. However, limited by poor light harvesting, serious charge recombination of semiconductors, and high surface reaction barriers, the low efficiency of solar conversion is far from satisfactory for industrial needs. Ferroelectrics are considered to be promising photocatalysts to overcome these shortcomings. Herein, perovskite ferroelectrics such as BaTiO 3 , PbTiO 3 , BiFeO 3 and LiNbO 3 , layered bismuth-based ferroelectrics like Bi 2 WO 6 and Bi 2 MoO 6 , and other ferroelectrics are introduced, and their crystal structure, polarity source and synthetic method are highlighted. Subsequently, research progress in ferroelectrics for photocatalysis is summarized, including pollution degradation, water splitting and CO 2 reduction. Finally, the current challenges and future prospects of ferroelectric photocatalysts are provided. The purpose of this review is not only to provide a timely summary for the application of ferroelectrics in photocatalysis, but also to present deep insight and a guideline for future research work into ferroelectrics.

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Modification of photocatalytic property of BaTiO3 perovskite structure by Fe2O3 nanoparticles for CO2 reduction in gas phase

Cited by 14 publications

References 28 publications

Comparative Raman spectroscopy of astrobiology relevant bio‐samples and planetary surface analogs under UV–VIS–IR excitation

Comparative Raman spectroscopy of astrobiology relevant bio‐samples and planetary surface analogs under UV–VIS–IR excitation

Underlying physics and chemistry of ferroic-photocatalysis: a critical review

Ferroelectrics in Photocatalysis

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