Chromium-modified Bi 4 Ti 3 O 12 photocatalyst: Application for hydrogen evolution and pollutant degradation

Chen, Zhiwu; Jiang, Xunyang; Zhu, Cheng; Shi, Chuan

doi:10.1016/j.apcatb.2016.06.036

Cited by 115 publications

(32 citation statements)

References 64 publications

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“…TiO 2 has been widely used as a photocatalyst for energy conversion and pollutant elimination because of its high activity and stability, low cost, availability and nontoxicity [86]. However, it is only activated under UV radiation, because of its large band gap (about 3.2 eV).…”

Section: Photocatalyticmentioning

confidence: 99%

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Review and Perspectives of Aurivillius Structures as a Lead-Free Piezoelectric System

Moure

2018

Applied Sciences

107

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According to the EU-Directives 2002/95/EC, 2002/96/EC, lead-based piezoceramics must be substituted in the future with more environmentally friendly alternatives, only when a reliable alternative is found. This is why an increasing interest has grown in the research community to find lead free piezoelectric materials that fulfil the requirements for this substitution. Different families of compounds have been shown to be possible candidates for this use, such as bismuth and niobates based perovskites, pyrochlores, etc. However, a material with piezoelectric coefficients similar to those of PZT (lead zirconate titanate, Pb[Zr x Ti 1-x ]O 3 ) has not been yet found. Besides, each of these families has its specific characteristics in terms of remnant polarization, coercive field or application temperature. Thus, the choice of each material should be made according to the specific needs of the application. In this sense, Aurivillius-type structure materials (also known as Bismuth Layered Structure Ferroelectrics, BLSF) can take advantage of their specific properties for uses as Lead Free Piezoelectric systems. Some of them have a high Curie temperature, which make them good candidates to be used as high temperature piezoelectrics; high coercive fields, which facilitates their use as actuators; or a high switching fatigue resistance, which can be useful for future applications as Ferroelectric Random Access Memories (FERAM).Keywords: bismuth layered ferroelectric structures; aurivillius; piezoelectric; multiferroic OverviewMany of the peculiar characteristic properties of Aurivillius materials are determined by their crystalline structure. Figure 1 shows the prototype of the Aurivillius structure as a function of the number of pseudo-perovskite layers [2]. The "n" values can range from 1 to ∞. In this case (n = ∞), the repeated cell is the pure perovskite. The number of perovskites can be odd, even or a mixture. Examples of each case are Bi 2 WO 6 (n = 1) and Bi 4 Ti 3 O 12 (n = 3); Bi 3 TiNbO 9 , SrBi 2 Nb 2 O 9 (n = 2) and CaBi 4 Ti 4 O 12 (n = 4); an example for a mixture Aurivillius is Bi 7 Ti 4 NbO 21 . In this case, layers with 2 or 3 pseudo-perovskites are alternated with the [Bi 2 O 2 ] 2+ layers.At difference of the ferroelectrics with perovskite structure, the polarization is not produced by the displacement of the B cation within the oxygen octahedral but by relative shifts of the oxygen octahedral through the a-axis with respect to the [001] bismuth chain. They can be divided in 3 main movements, as illustrated in references [3-5]:Oxygen octahedral in the a-axis. -Relative displacements in the opposite direction to B cations of the perovskite with respect to the octahedral. -Displacement through the a-axis of the oxygen ions of the Bi-O layer.

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Section: Photocatalyticmentioning

confidence: 99%

“…The photocatalytic activity is high, although lower than for TiO 2 . In can be improved by selective doping, as in the case of Cr [86]. Further improvement could be achieved by reducing the electron-hole combination (promoting the appearance of oxygen vacancies, for instance) or increasing the light absorption.…”

Section: Photocatalyticmentioning

confidence: 99%

Review and Perspectives of Aurivillius Structures as a Lead-Free Piezoelectric System

Moure

2018

Applied Sciences

107

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“…Transition metal ions like Fe, Mn, Cu, Ni, and Cr have been shown to modify the bandgap position of semiconductor materials [10][11][12][13][14][15] without enhancing the formation of water, which is the case when noble metals (e.g., Rh, Pt) are employed [3,9]. The switch towards the visible light region was also achieved by doping titanate-based materials with Fe [9,16,17], Cr [5,[18][19][20], and Cu [21,22].…”

Section: Introductionmentioning

confidence: 99%

Influence of Metal Oxide Particles on Bandgap of 1D Photocatalysts Based on SrTiO3/PAN Fibers

et al. 2020

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This paper deals with the study of the optical properties of one-dimensional SrTiO3/PAN-based photocatalysts with the addition of metal oxide particles and the determination of their bandgaps. One-dimensional photocatalysts were obtained by the electrospinning method. Particles of metals such as iron, chromium, and copper were used as additives that are capable of improving the fibers’ photocatalytic properties based on SrTiO3/PAN. The optimal ratios of the solutions for the electrospinning of fibers based on SrTiO3/PAN with the addition of metal oxide particles were determined. The transmission and reflection of composite photocatalysts with metal oxide particles were measured in a wide range of spectra, from the ultraviolet region (185 nm) to near-infrared radiation (3600 nm), to determine the values of their bandgaps. Thus, the introduction of metal oxide particles resulted in a decrease in the bandgaps of the obtained composite photocatalysts compared to the initial SrTiO3/PAN (3.57 eV), with the following values: −3.11 eV for SrTiO3/PAN/Fe2O3, −2.84 eV for SrTiO3/PAN/CuO, and −2.89 eV for SrTiO3/PAN/Cr2O3. The obtained composite photocatalysts were tested for the production of hydrogen by the splitting of water–methanol mixtures under UV irradiation, and the following rates of hydrogen evolution were determined: 344.67 µmol h−1 g−1 for SrTiO3/PAN/Fe2O3, 398.93 µmol h−1 g−1 for SrTiO3/PAN/Cr2O3, and 420.82 µmol h−1 g−1 for SrTiO3/PAN/CuO.

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“…Bismuth is also an efficient and economical catalyst with layered structures, high catalytic properties, and has good potential to be a visible light‐driven photocatalyst 8 . Bismuth complex oxides, such as BiOX (X = Cl, Br or I), 9 Bi 2 O 3 , Bi 4 Ti 3 O 12 , 10 Bi 2 WO 6 , 11 BiVO 4 , 12 BiFeO 3 , 13 and Bi 2 MoO 6 , 14 etc, have all been reported to show excellent photocatalytic properties. Among them, Bi 2 O 3 ‐based catalysts have attracted a lot of attention in pollutant degradation 15 .…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of CeO₂/Bi₂O₃/gC₃N₄ ternary Z‐scheme nanocomposite

Devi

Mathew

Rajan

et al. 2020

Int J Applied Ceramic Tech

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An effective and facile phytogenic method was used to prepare CeO2/Bi2O3 and CeO2/Bi2O3/gC3N4 composites using Eichhornia crassipes phytoextract. The synthesized catalysts were characterized using techniques such as XRD, FTIR, UV‐DRS, PL, SEM‐EDAX, XPS, zeta potential, and TGA. These catalysts showed diverse photocatalytic and optical properties due to the alteration in the bandgap. The synthesized composites exhibited good photocatalytic activity by degrading Malachite green (MG) dye. The increase in the photocatalytic activity could be attributed to the p‐n heterojunction of the catalysts with efficient charge separation and strong oxidative ability. The modified photocatalysts showed excellent catalytic activity and reusability under visible light. The superior efficiency and its applications in environmental remediation make these catalysts a potential candidate for photocatalysis.

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Chromium-modified Bi 4 Ti 3 O 12 photocatalyst: Application for hydrogen evolution and pollutant degradation

Cited by 115 publications

References 64 publications

Review and Perspectives of Aurivillius Structures as a Lead-Free Piezoelectric System

Review and Perspectives of Aurivillius Structures as a Lead-Free Piezoelectric System

Influence of Metal Oxide Particles on Bandgap of 1D Photocatalysts Based on SrTiO3/PAN Fibers

Synthesis and characterization of CeO₂/Bi₂O₃/gC₃N₄ ternary Z‐scheme nanocomposite

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Chromium-modified Bi 4 Ti 3 O 12 photocatalyst: Application for hydrogen evolution and pollutant degradation

Cited by 115 publications

References 64 publications

Review and Perspectives of Aurivillius Structures as a Lead-Free Piezoelectric System

Review and Perspectives of Aurivillius Structures as a Lead-Free Piezoelectric System

Influence of Metal Oxide Particles on Bandgap of 1D Photocatalysts Based on SrTiO3/PAN Fibers

Synthesis and characterization of CeO2/Bi2O3/gC3N4 ternary Z‐scheme nanocomposite

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Synthesis and characterization of CeO₂/Bi₂O₃/gC₃N₄ ternary Z‐scheme nanocomposite