Facile hydrothermal synthesis of Yb doped Bi4V2O11 nanoparticles for the improvement of photocatalytic and AC impedance performance: Investigation of polymorphism, adsorption isotherm, optical properties and possible mechanism with the help of GCMS

Anwar, Kaseed; Naqvi, Faria K.; Beg, Saba

doi:10.1016/j.jallcom.2022.168483

Cited by 12 publications

(4 citation statements)

References 99 publications

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“…Compared with BTO, the peak frequency of HBTO-4 phonons was reduced, the peaks became broader and more diffuse, and a slight red-shift was observed at 266 and 848 cm –1 . This indicated that the coordination environment and structure of the [TiO 6 ] octahedron have changed, further verifying the presence of oxygen vacancies and Ti 3+ defects on the surface of HBTO-4 . The low-temperature (110 K) vacuum electron paramagnetic resonance (EPR) spectroscopy was used to further analyze the defects in the sample.…”

Section: Resultsmentioning

confidence: 93%

“…This indicated that the octahedron have changed, further verifying the presence of oxygen vacancies and Ti 3+ defects on the surface of HBTO-4. 50 The low-temperature (110 K) vacuum electron paramagnetic resonance (EPR) spectroscopy was used to further analyze the defects in the sample. As shown in the Figure 4b, the signal at g = 2.003 was assigned as oxygen vacancy.…”

Section: Resultsmentioning

confidence: 99%

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Intentionally Introducing Oxygen Vacancies and Ti³⁺ Defects on the Surface of Bi₄Ti₃O₁₂ Nanosheets for Promoting the Photoreduction of CO₂ to CH₃OH

Wang,

Qiu,

Xie

et al. 2024

ACS Appl. Nano Mater.

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Using perovskite photocatalytic reduction of CO 2 and H 2 O to produce hydrocarbon fuels offers an attractive method to solve the energy crisis and the greenhouse effect. Bi 4 Ti 3 O 12 (BTO) has received much attention in the field of photocatalysis due to its unique layered structure, but it still faces many challenges such as weak photoresponse and severe photogenerated carrier recombination. In this paper, Bi 4 Ti 3 O 12 nanosheets with different concentrations of surface oxygen vacancies (V O ) and Ti 3+ defect were prepared by the molten salt method and NaBH 4 hightemperature reduction method (HBTO). Surface defects formed obvious carrier traps on the HBTO surface, reduced the recombination rate of photogenerated electrons and holes, and adjusted the band gap structure (from 3.09 to 2.62 eV), which improved the visible light utilization of HBTO. The decrease of photoinduced carrier recombination rate and the improvement of visible light response significantly enhanced the photocatalytic CO 2 reduction activity of HBTO under visible light. The CH 3 OH yield with the optimized HBTO-4 (NaBH 4 :Bi 4 Ti 3 O 12 = 1:5) was 4.90 μmol•g −1 •h −1 , which was about 3.5 times that of the original BTO. Meanwhile, the band gap structure, electronic density of states (DOS), and work function were calculated by the density functional theory (DFT). This study provided an effective strategy for designing and preparing perovskite photocatalysts rich in surface defects for the efficient conversion of solar energy. KEYWORDS: Bi 4 Ti 3 O 12 , photocatalytic CO 2 reduction, oxygen vacancy, Ti 3+ defects, CH 3 OH

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Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Intentionally Introducing Oxygen Vacancies and Ti³⁺ Defects on the Surface of Bi₄Ti₃O₁₂ Nanosheets for Promoting the Photoreduction of CO₂ to CH₃OH

Wang,

Qiu,

Xie

et al. 2024

ACS Appl. Nano Mater.

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“…Raman spectroscopy can be used to study the structural defects in the samples Figure A shows the Raman spectroscopy of the NiTi catalysts.…”

Section: Resultsmentioning

confidence: 99%

“…Raman spectroscopy can be used to study the structural defects in the samples. 37 Figure 6A shows the Raman spectroscopy of the NiTi catalysts. The band at 150 cm −1 is ascribed to the TiO 2 vibration, while the peak at 200 cm −1 is attributed to the Ov on TiO 2 .…”

Section: Catalyst Synthesismentioning

confidence: 99%

Highly Efficient Hydrogenation of Nitrocyclohexane to Cyclohexanone Oxime over NiTi-Layered Double Hydroxide: The Key Role of Oxygen Vacancies

Zhang,

Liao,

Cui

et al. 2023

ACS Sustainable Chem. Eng.

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Highly efficient selective hydrogenation of nitrocyclohexane (NCH) to cyclohexanone oxime (CHO) is important for the production of caprolactam. In this work, NiTi catalysts (NiTi-IMP, NiTi-HDT, and NiTi-LDH) were prepared by different methods and applied in NCH hydrogenation to CHO. It was found that NiTi-LDH with rich oxygen vacancies (Ov) induces a strong metal−support interaction (SMSI) between Ni and TiO 2 , hence favoring the dispersion of Ni nanoparticles, promoting the reduction of NiO and the formation of much more metallic Ni, and facilitating the electron transfer between Ni and Ti. In situ DRIFTS reveals the mechanism for NCH hydrogenation on Ov-rich NiTi-LDH, showing that Ov benefits the enhancement of NCH conversion and suppresses overhydrogenation to the byproducts of cyclohexanone (CHone) and cyclohexylamine (CHA). Moreover, density functional theory (DFT) calculations illustrate that Ov facilitates the adsorption of NCH and desorption of CHO, favors the α-H transfer of nitrosocyclohexane (N−CHH) to CHO, and significantly reduces the overall reaction energy barrier of NCH to CHO. Under optimum conditions, NiTi-2 with the largest amount of Ov gives 90.71% selectivity to CHO at 99.84% NCH conversion. This study provides an efficient and economical catalyst for the preparation of CHO from NCH, and it is valuable for promoting the industrial production of caprolactam toward resource conservation and environment friendliness.

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Structural, electrical, optical, and microstructural properties of Bi4V2-xCux/2Sbx/2O11-3x/4

Mhaira,

Agnaou,

Essalim

et al. 2023

J Solid State Electrochem

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Facile hydrothermal synthesis of Yb doped Bi4V2O11 nanoparticles for the improvement of photocatalytic and AC impedance performance: Investigation of polymorphism, adsorption isotherm, optical properties and possible mechanism with the help of GCMS

Cited by 12 publications

References 99 publications

Intentionally Introducing Oxygen Vacancies and Ti³⁺ Defects on the Surface of Bi₄Ti₃O₁₂ Nanosheets for Promoting the Photoreduction of CO₂ to CH₃OH

Intentionally Introducing Oxygen Vacancies and Ti³⁺ Defects on the Surface of Bi₄Ti₃O₁₂ Nanosheets for Promoting the Photoreduction of CO₂ to CH₃OH

Highly Efficient Hydrogenation of Nitrocyclohexane to Cyclohexanone Oxime over NiTi-Layered Double Hydroxide: The Key Role of Oxygen Vacancies

Structural, electrical, optical, and microstructural properties of Bi4V2-xCux/2Sbx/2O11-3x/4

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Facile hydrothermal synthesis of Yb doped Bi4V2O11 nanoparticles for the improvement of photocatalytic and AC impedance performance: Investigation of polymorphism, adsorption isotherm, optical properties and possible mechanism with the help of GCMS

Cited by 12 publications

References 99 publications

Intentionally Introducing Oxygen Vacancies and Ti3+ Defects on the Surface of Bi4Ti3O12 Nanosheets for Promoting the Photoreduction of CO2 to CH3OH

Intentionally Introducing Oxygen Vacancies and Ti3+ Defects on the Surface of Bi4Ti3O12 Nanosheets for Promoting the Photoreduction of CO2 to CH3OH

Highly Efficient Hydrogenation of Nitrocyclohexane to Cyclohexanone Oxime over NiTi-Layered Double Hydroxide: The Key Role of Oxygen Vacancies

Structural, electrical, optical, and microstructural properties of Bi4V2-xCux/2Sbx/2O11-3x/4

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Product

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Intentionally Introducing Oxygen Vacancies and Ti³⁺ Defects on the Surface of Bi₄Ti₃O₁₂ Nanosheets for Promoting the Photoreduction of CO₂ to CH₃OH

Intentionally Introducing Oxygen Vacancies and Ti³⁺ Defects on the Surface of Bi₄Ti₃O₁₂ Nanosheets for Promoting the Photoreduction of CO₂ to CH₃OH