Effect of surface loading and bulk doping of La 3+ on the thermal stability and photocatalytic activity of Bi 2 O 2 CO 3

Li, Shuai; Zhang, Jing; Chen, Xuebing; Feng, Zhaochi; Li, Can

doi:10.1016/j.materresbull.2017.05.058

Cited by 20 publications

(7 citation statements)

References 43 publications

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“…They shift toward the low‐energy side (159.3 eV for Bi 4f 7/2 and 164.4 eV for Bi 4f 5/2 ) in the dark brown part, as shown in the up curve in Figure A. Generally, we think that the main peaks at 159.7 and 164.8 eV originate from Bi 3+ ions, whereas peaks at the smaller binding energy stem from low valence stated Bi centers. Here, Bi with different valence states coexist in 20Al glass sample and bismuth transforms from a relatively high valence state in the light brown part of glass to a lower valence state in the dark brown part.…”

Section: Resultsmentioning

confidence: 83%

“…To know more about the bismuth centers in our glass, XPS analyses of Bi 4f were carried out. As shown in Figure A, Bi 4f 7/2 and Bi 4f 5/2 XPS of the dark and light brown parts in 20Al samples are given in the up and down curves, respectively. Illustrated in the down curve, the binding energies of Bi 4f 7/2 and Bi 4f 5/2 in the light brown part of 20Al sample are about 159.7 and 164.8 eV, respectively.…”

Section: Resultsmentioning

confidence: 95%

“…Generally, we think that the main peaks at 159.7 and 164.8 eV originate from Bi 3+ ions, 37,38 whereas peaks at the smaller binding energy stem from low valence stated Bi centers. Here, Bi with different valence states coexist in 20Al glass sample and bismuth transforms from a relatively high valence state in the light brown part of glass to a lower valence state 37 in the dark brown part. More Bi centers with lower valence state are located at the dark brown part of 20Al glass, and they color glass sample with brown.…”

Section: Resultsmentioning

confidence: 98%

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The origin of the heterogeneous distribution of bismuth in aluminosilicate laser glasses

Cao

Peng

2018

J Am Ceram Soc

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As one kind of novel and burgeoning laser materials, bismuth‐doped silicate glasses have aroused increasing attention for the super broadband near‐infrared (NIR) emission. However, the large optical scattering loss, resulting from optical heterogeneity in glass color and refractive index, limits their further applications in telecommunication system. Thus, it is urgent to uncover the essence of heterogeneity in Bi‐doped silicate glasses and subsequently improve glass optical performance. It will give us some hint to homogenize the glass component and Bi active centers so as to boost the development of Bi‐based glass materials. Here, taking 1 typical Bi‐doped calcium aluminosilicate glass as an example, we revealed the origin of the optical heterogeneities in glass color and refractive index through the NIR emission spectra, electron probe microanalyzer (EPMA) of elements and X‐ray photoelectron spectroscopy (XPS) of Bi 4f5/2, Bi 4f7/2, and Al 2p. The inhomogeneous distribution of Bi and aluminum components is responsible for the heterogeneity in this glass system. In addition, we found that tetrahedral coordinated aluminum favors the existence of Bi NIR centers, consequently resulting in enhanced Bi NIR emissions. Furthermore, based on our results and the role of Al3+ in glass network, we demonstrate the homogenizing of glass component by finely tuning glass composition. This work will enrich the understanding of Bi‐doped laser glass and provide a guideline for the design of component‐derived Bi‐doped silicate glasses and fibers with efficient NIR emission and high optical quality.

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Section: Resultsmentioning

confidence: 83%

Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 98%

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The origin of the heterogeneous distribution of bismuth in aluminosilicate laser glasses

Cao

Peng

2018

J Am Ceram Soc

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“…Of the three signals of C1s detected, those centered at 285.0 and 287.0 eV could attribute to carbon species acquired from environmental contamination during the measurements of XPS [14,19,22,33]. On the other hand, the signal at 290.2 eV is attributable to the ion CO 3 2− present in the sample [22,33]. This result confirms what is obtained by FTIR, where the anion present in the compound Bi 2 O 2 CO 3 :Al is the carbonate ion.…”

Section: X-ray Photoelectron Spectroscopy Xpsmentioning

confidence: 99%

“…Since Bi 2 O 2 CO 3 has a wide gap (3.1 to 3.5 eV), it can be easily activated with UV light, so that doping improves its photocatalytic activity towards the visible range [18]. Previous studies have reported the synthesis of Bi 2 O 2 CO 3 doped with nitrogen [19][20][21], europium [8], carbon [22], lanthanum [23], iron [24], bromine [25], palladium [26], iodine [27,28], sulfur and antimony [6], that have enhanced the photocatalytic properties of Bi 2 O 2 CO 3 under visible light. However, it is also expected Bi 2 O 2 CO 3 that own hierarchical structure assembled by nanosheets or nanoplates show more active photocatalysis [2].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of a New Aluminum-Doped Bismuth Subcarbonate

et al. 2019

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A new compound, Bi2O2CO3:Al, was synthesized by the coprecipitation method. The characterization was done by X-ray diffraction (XRD), Fourier transformed infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), electronic scanning microscopy (SEM), and energy dispersive X-ray spectroscopy (EDX). The characterization methods allowed to identify the Bi2O2CO3:Al compound, such as the Al-doped Bi2O2CO3 by XRD, the anionic part (CO32−) by FTIR, and the presence of aluminum in the compound by XPS and EDX. It was confirmed to have a nanostructure like a nanosheet and a microstructure that resembles a type sponge by SEM.

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Enhanced Photocatalytic Activity of Nickel(II)‐Doped Bi₂O₂CO₃ Nanosheets for Efficient Nitric Oxide Removal

Wei,

Zhu,

Ren

et al. 2024

ChemPhotoChem

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Bi2O2CO3 is a typical bismuth‐based semiconductor photocatalyst that has attracted much attention because of layered structure and polarization characteristics. However, the wide bandgap of Bi2O2CO3 limits its practical applications in photocatalysis. In this study, the nickel‐doped Bi2O2CO3 (Ni2+‐Bi2O2CO3) was prepared by adding a controllable amount of nickel ions. The photocatalytic efficiency of the optimized sample for ppb‐grade NO under visible light irradiation is 59.4%, which is 2.8 times than that of its counterpart, Bi2O2CO3 (21.2%). Based on experiments and characterizations, Introduction of nickel ions improves the photocatalytic performance of Ni2+‐Bi2O2CO3, which not only lowered the bandgap from 3.25 eV to 2.92 eV, but also reduced the recombination of photogenerated carriers by formation of the impurity level. Furthermore, the adsorption and photocatalytic conversion pathway of NO was explored by in situ DRIFTS, the principal byproducts of photocatalytic oxidation of NO are NO3− and NO2−. This work offers a new perspective to improve the photocatalytic activity by doping mothed for air purification.

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Effect of surface loading and bulk doping of La 3+ on the thermal stability and photocatalytic activity of Bi 2 O 2 CO 3

Cited by 20 publications

References 43 publications

The origin of the heterogeneous distribution of bismuth in aluminosilicate laser glasses

The origin of the heterogeneous distribution of bismuth in aluminosilicate laser glasses

Synthesis and Characterization of a New Aluminum-Doped Bismuth Subcarbonate

Enhanced Photocatalytic Activity of Nickel(II)‐Doped Bi₂O₂CO₃ Nanosheets for Efficient Nitric Oxide Removal

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Effect of surface loading and bulk doping of La 3+ on the thermal stability and photocatalytic activity of Bi 2 O 2 CO 3

Cited by 20 publications

References 43 publications

The origin of the heterogeneous distribution of bismuth in aluminosilicate laser glasses

The origin of the heterogeneous distribution of bismuth in aluminosilicate laser glasses

Synthesis and Characterization of a New Aluminum-Doped Bismuth Subcarbonate

Enhanced Photocatalytic Activity of Nickel(II)‐Doped Bi2O2CO3 Nanosheets for Efficient Nitric Oxide Removal

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Product

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Enhanced Photocatalytic Activity of Nickel(II)‐Doped Bi₂O₂CO₃ Nanosheets for Efficient Nitric Oxide Removal