Structural Modification of Cubic Zinc Bismuth Spinel Induced by Lead Substitution

Eddya, Mohammed; Tbib, Bouazza; El-Hami, Khalil

doi:10.1007/978-3-030-36671-1_57

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“…For all samples, the broad peaks observed in the range of 3400–3500 cm –1 can be assigned to the O–H stretching vibration, and the peak located at 1605 cm –1 is attributed to the O–H bending vibration . The characteristic peaks appeared at 1368 cm –1 , and the range of 500–700 cm –1 is due to Bi–O and Zn–O bonds in ZnBi 2 O 4 . The corresponding TiO 2 QD spectra show broad peaks in the range of 450–750 cm 1 , which are ascribed to the vibration of the Ti–O bonds …”

Section: Resultsmentioning

confidence: 89%

“…22 The characteristic peaks appeared at 1368 cm −1 , and the range of 500−700 cm −1 is due to Bi−O and Zn−O bonds in ZnBi 2 O 4 . 23 The corresponding TiO 2 QD spectra show broad peaks in the range of 450−750 cm 1 , which are ascribed to the vibration of the Ti−O bonds. 24 To evaluate the ability of light-harvesting and the range of the optical response, ultraviolet−visible diffuse reflection spectroscopy (UV−vis DRS) analysis was carried out, and spectral results are shown in Figure 3b.…”

Section: Resultsmentioning

confidence: 99%

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Novel p–n Heterojunction Nanocomposite: TiO₂ QDs/ZnBi₂O₄ Photocatalyst with Considerably Enhanced Photocatalytic Activity under Visible-Light Irradiation

Nguyen

Mousavi

et al. 2020

J. Phys. Chem. C

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The practical and widespread application of photocatalysts is limited by the problem of visible-light absorption, the immediate recombination of photogenerated electron–hole pairs, and the low number of active sites on their surface. We synthesized a series of novel TiO2 QDs/ZnBi2O4 nanocomposites through the hydrothermal method to overcome these problems. The formation of nanocomposites and their features were investigated by X-ray diffraction, Fourier transform infrared spectroscopy, energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, high-resolution transmission electron microscopy, photocurrent, field-emission scanning electron microscopy, transmission electron microscopy, electrochemical impedance spectroscopy, photoluminescence, Brunauer–Emmett–Teller, ultraviolet–visible diffuse reflection spectroscopy, and total organic carbon techniques. Among the different ratios of nanocomposites, the TiO2 QDs/ZnBi2O4 (10%) displayed the highest photocatalytic activity under visible-light irradiation, and the corresponding rhodamine B (RhB) degradation rate constant was 1022 × 10–4 min–1, which was nearly 77 and 5.9 times that of the TiO2 and TiO2 QD samples, respectively. In light of the mechanism study, the photocatalytic activity improvement can be ascribed to the p–n heterojunction formation, which led to an increase in the visible-light absorption, suppression of electron–hole recombination, and promotion of charge-carrier transfer. h+, •O2 –, and •OH were also identified as active species responsible for RhB photodegradation through the scavenging test. Phenol, Congo red, malachite green, and methyl orange were also degraded as various pollutants to ensure the prepared nanocomposites’ potential for practical applications. The nanocomposite stability was assessed during reuse evaluation experiments and showed good stability after four consecutive cycles. This work proposes a novel nanocomposite and provides an overview of its features for future applications.

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Section: Resultsmentioning

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Novel p–n Heterojunction Nanocomposite: TiO₂ QDs/ZnBi₂O₄ Photocatalyst with Considerably Enhanced Photocatalytic Activity under Visible-Light Irradiation

Nguyen

Mousavi

et al. 2020

J. Phys. Chem. C

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Structural Modification of Cubic Zinc Bismuth Spinel Induced by Lead Substitution

Cited by 1 publication

References 20 publications

Novel p–n Heterojunction Nanocomposite: TiO₂ QDs/ZnBi₂O₄ Photocatalyst with Considerably Enhanced Photocatalytic Activity under Visible-Light Irradiation

Novel p–n Heterojunction Nanocomposite: TiO₂ QDs/ZnBi₂O₄ Photocatalyst with Considerably Enhanced Photocatalytic Activity under Visible-Light Irradiation

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Structural Modification of Cubic Zinc Bismuth Spinel Induced by Lead Substitution

Cited by 1 publication

References 20 publications

Novel p–n Heterojunction Nanocomposite: TiO2 QDs/ZnBi2O4 Photocatalyst with Considerably Enhanced Photocatalytic Activity under Visible-Light Irradiation

Novel p–n Heterojunction Nanocomposite: TiO2 QDs/ZnBi2O4 Photocatalyst with Considerably Enhanced Photocatalytic Activity under Visible-Light Irradiation

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Novel p–n Heterojunction Nanocomposite: TiO₂ QDs/ZnBi₂O₄ Photocatalyst with Considerably Enhanced Photocatalytic Activity under Visible-Light Irradiation

Novel p–n Heterojunction Nanocomposite: TiO₂ QDs/ZnBi₂O₄ Photocatalyst with Considerably Enhanced Photocatalytic Activity under Visible-Light Irradiation