Hydrothermal synthesis of novel flower-like BiVO 4 /Bi 2 Ti 2 O 7 with superior photocatalytic activity toward tetracycline removal

Li, Jinhai; Han, Ming‐Yong; Guo, Yang; Wang, Fei; Meng, Lei; Mao, Danjun; Ding, Shanshan; Sun, Cheng

doi:10.1016/j.apcata.2016.06.025

Cited by 73 publications

(13 citation statements)

References 36 publications

(66 reference statements)

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“…As shown in Figure S1(f3), the (400) facet with a d -spacing of 0.270 nm and the (222) facet with a d -spacing of 0.313 nm can be observed for Bi 2 Sn 2 O 7 with a well-ordered pyrochlore phase . In contrast, only (444) facet with a d -spacing of 0.297 nm is observed for Bi 2 Ti 2 O 7 with a less-ordered pyrochlore phase . For Bi 2 Zr 2 O 7 with a defect cubic fluorite phase, the (222) facet with a d -spacing of 0.306 nm is detected .…”

Section: Resultsmentioning

confidence: 93%

“…49 In contrast, only (444) facet with a d-spacing of 0.297 nm is observed for Bi 2 Ti 2 O 7 with a less-ordered pyrochlore phase. 50 For Bi 2 Zr 2 O 7 with a defect cubic fluorite phase, the (222) facet with a d-spacing of 0.306 nm is detected. 51 The HRTEM diffraction results are in good agreement with the XRD measurements, confirming the formation of different crystalline phases in the compounds by varying the B-site cation.…”

Section: Resultsmentioning

confidence: 96%

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Unraveling the Principles of Lattice Disorder Degree of Bi₂B₂O₇ (B = Sn, Ti, Zr) Compounds on Activating Gas Phase O₂ for Soot Combustion

Feng

et al. 2021

ACS Catal.

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With the combination of experimental methods and DFT calculations, the influence of lattice disorder degree on the catalytic property of Bi2B2O7 compounds with different B-site cations (B = Sn, Ti, Zr) has been elucidated in this work. The crystal structures of the samples vary from a well-ordered pyrochlore (Bi2Sn2O7) to a less-ordered pyrochlore (Bi2Ti2O7), and eventually to a disordered defect fluorite (Bi2Zr2O7) phase, hence the lattice disorder degree increases. DFT calculation and oxygen ion conductivity results have testified that the surface oxygen vacancy formation energies (E O‑f) of the catalysts decrease with the increase of the disorder degree, accompanying the improvement of the lattice ion mobility and the formation of more surface oxygen vacancies. Isotopic 18O2 tracing experiments have demonstrated that the adsorbing and activating of gas phase O2 molecules mainly follow an R2 mechanism requiring two adjacent surface vacancies. With the synergistic actions of surface oxygen vacancies and lattice O2– anions, both active O2 – and O2 2– sites contributing vitally to soot combustion can be formed. Therefore, the abundance of surface oxygen vacancies is of great importance for this process, which is intimately related to the lattice disorder degree of the compounds. From this point of view, it is concluded that the lattice disorder degree is the inherent factor to determine the redox property and reaction performance of Bi2B2O7 compounds for soot combustion.

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Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 96%

Unraveling the Principles of Lattice Disorder Degree of Bi₂B₂O₇ (B = Sn, Ti, Zr) Compounds on Activating Gas Phase O₂ for Soot Combustion

Feng

et al. 2021

ACS Catal.

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“…possesses an improvement in photoactivity. 25,28,47 One of the well-known problems of Bi 2 Ti 2 O 7 is its low thermal stability, although it is possible to obtain a pure bismuth titanate pyrochlore by soft synthetic methods (e.g., coprecipitation, hydrothermal synthesis) or to stabilize the pyrochlore phase by doping with suitable elements. On the basis of the aforementioned advantages, the following strategies to enhance the photocatalytic activity of Bi 2 Ti 2 O 7 in visible light can be offereddoping, heterojunction construction, and specific morphology development.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Its conduction band (CB) and valence band (VB) have suitable energy levels to create efficient type heterojunction photocatalysts between Bi 2 Ti 2 O 7 and the other semiconductors (e.g., TiO 2 , Bi 4 Ti 3 O 12 , BiOCl, Bi 2 O 3 ). ,,,,− Moreover, Bi 2 Ti 2 O 7 prepared with different morphologies (nanospheres, nanorods, nanoflower-like, etc.) possesses an improvement in photoactivity. ,, One of the well-known problems of Bi 2 Ti 2 O 7 is its low thermal stability, although it is possible to obtain a pure bismuth titanate pyrochlore by soft synthetic methods (e.g., coprecipitation, hydrothermal synthesis) or to stabilize the pyrochlore phase by doping with suitable elements. On the basis of the aforementioned advantages, the following strategies to enhance the photocatalytic activity of Bi 2 Ti 2 O 7 in visible light can be offereddoping, heterojunction construction, and specific morphology development.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Properties of Bi_2–xTi₂O_7–1.5x (x = 0, 0.5) Pyrochlores: Hybrid DFT Calculations and Experimental Study

et al. 2020

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The photocatalytic properties of Bi2–x Ti2O7–1.5x (x = 0, 0.5) pyrochlores are examined via ab initio calculations and experiments. A coprecipitation method is applied for the synthesis of nanopowder pyrochlores. The pyrochlore phase formation starts at 500 °C (Bi2Ti2O7) and 550 °C (Bi1.5Ti2O6.25). Nanopowders are found to be a metastable character of pyrochlore phases. The presence of bismuth and oxygen vacancies enhances the thermal stability of the Bi1.5Ti2O6.25 phase in comparison with the Bi2Ti2O7 phase. The estimated crystallite size is 30–40 nm with noticeable agglomerates of about 100–300 nm according to scanning electron microscopy (SEM) and with the formation of particles (510–580 nm) in the aqueous medium. The isoelectric points of the nanopowders seem to be shifted to the strongly acidic region, resulting in the formation of negative surface particle charges of −33 mV (Bi2Ti2O7) and −27 mV (Bi1.5Ti2O6.25) at pH 5.88 in distilled water. The specific surface area is 11.5 m2/g (Bi2Ti2O7) and 12.00 m2/g (Bi1.5Ti2O6.25). The use of the generalized gradient approximation (GGA) with the Perdew–Burke–Ernzerhof (PBE) functional allows achieving an excellent agreement between theoretical and experimental structural parameters. The screened Coulomb hybrid HSE03 functional is the most appropriate for describing the optoelectronic properties. Bismuth titanate pyrochlores are wide-gap semiconductors with strong abilities to be active photocatalysts under visible irradiation. The optical E g values for direct/indirect transition according to the experiment, 3.19/2.94 eV (x = 0) and 3.24/3.03 eV (x = 0.5), and the DFT/HSE03 calculations, 2.92/2.87 (x = 0) and 3.42/– eV (x = 0.5), are in the visible light region and are close. The calculated low effective masses of the charge carriers and suitable band edge positions confirm the ability of the pyrochlores to act as photocatalysts. The photocatalytic activity has been evaluated through the decomposition of rhodamine B under visible irradiation. Bi2Ti2O7 shows the highest activity in comparison with Bi1.5Ti2O6.25, which is in good agreement with theoretically predicted and experimentally revealed characteristics.

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“…The LaVO 4 coating layer prepared using the hydrothermal method was uniformly coated on the surface of the CNT. Li et al [119] reported a novel flower-like BiVO 4 and BiVO 4 /Bi 2 Ti 2 O 7 heterojunction photocatalyst using a surfactant-free hydrothermal method. A mixed aqueous solution of Bi(NO 3 ) 3 ·5H 2 O and Na 3 VO 4 ·12H 2 O was transferred to a sealed Teflon autoclave and heated at 160 °C for 12 h. Similarly, Lin et al [120] also prepared monoclinic BiVO 4 using the hydrothermal method without surfactant.…”

Section: Applicationmentioning

confidence: 99%

Conventional and Microwave Hydrothermal Synthesis and Application of Functional Materials: A Review

2019

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With the continuous development and progress of materials science, increasingly more attention has been paid to the new technology of powder synthesis and material preparation. The hydrothermal method is a promising liquid phase preparation technology that has developed rapidly during recent years. It is widely used in many fields, such as the piezoelectric, ferroelectric, ceramic powder, and oxide film fields. The hydrothermal method has resulted in many new methods during the long-term research process, such as adding other force fields to the hydrothermal condition reaction system. These force fields mainly include direct current, electric, magnetic (autoclaves composed of non-ferroelectric materials), and microwave fields. Among them, the microwave hydrothermal method, as an extension of the hydrothermal reaction, cleverly uses the microwave temperature to compensate for the lack of temperature in the hydrothermal method, allowing better practical application. This paper reviews the development of the hydrothermal and microwave hydrothermal methods, introduces their reaction mechanisms, and focuses on the practical application of the two methods.

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Hydrothermal synthesis of novel flower-like BiVO 4 /Bi 2 Ti 2 O 7 with superior photocatalytic activity toward tetracycline removal

Cited by 73 publications

References 36 publications

Unraveling the Principles of Lattice Disorder Degree of Bi₂B₂O₇ (B = Sn, Ti, Zr) Compounds on Activating Gas Phase O₂ for Soot Combustion

Unraveling the Principles of Lattice Disorder Degree of Bi₂B₂O₇ (B = Sn, Ti, Zr) Compounds on Activating Gas Phase O₂ for Soot Combustion

Photocatalytic Properties of Bi_2–xTi₂O_7–1.5x (x = 0, 0.5) Pyrochlores: Hybrid DFT Calculations and Experimental Study

Conventional and Microwave Hydrothermal Synthesis and Application of Functional Materials: A Review

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Hydrothermal synthesis of novel flower-like BiVO 4 /Bi 2 Ti 2 O 7 with superior photocatalytic activity toward tetracycline removal

Cited by 73 publications

References 36 publications

Unraveling the Principles of Lattice Disorder Degree of Bi2B2O7 (B = Sn, Ti, Zr) Compounds on Activating Gas Phase O2 for Soot Combustion

Unraveling the Principles of Lattice Disorder Degree of Bi2B2O7 (B = Sn, Ti, Zr) Compounds on Activating Gas Phase O2 for Soot Combustion

Photocatalytic Properties of Bi2–xTi2O7–1.5x (x = 0, 0.5) Pyrochlores: Hybrid DFT Calculations and Experimental Study

Conventional and Microwave Hydrothermal Synthesis and Application of Functional Materials: A Review

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Unraveling the Principles of Lattice Disorder Degree of Bi₂B₂O₇ (B = Sn, Ti, Zr) Compounds on Activating Gas Phase O₂ for Soot Combustion

Unraveling the Principles of Lattice Disorder Degree of Bi₂B₂O₇ (B = Sn, Ti, Zr) Compounds on Activating Gas Phase O₂ for Soot Combustion

Photocatalytic Properties of Bi_2–xTi₂O_7–1.5x (x = 0, 0.5) Pyrochlores: Hybrid DFT Calculations and Experimental Study