Synthesis, structure, optical, voltammetric and photocatalytic properties of manganese-activated ZnO

Гырдасова, О. И.; Sycheva, Natalya S.; Бакланова, И. В.; Buldakova, L. Yu.; Yanchenko, M. Yu.; Nefedova, K. V.; Красильников, В. Н.

doi:10.1007/s10854-019-01207-1

Cited by 4 publications

(1 citation statement)

References 42 publications

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“…They offer the possibility of applying natural and renewable solar energy as a light source for the purification of water, air, and surfaces from organic and inorganic pollutants (including highly toxic phenols, nitrogen oxides, etc. ). − These perspectives define the photocatalytic process as environmentally friendly and cost-effective. In addition, photocatalysis is promising for the production of hydrogen by water splitting in photoelectrochemical cells for clean energy − and for carrying out organic synthesis reactions. − Currently, the most studied photocatalyst is titanium dioxide in its anatase modification, but its wide band gap (3.2 eV) causes photocatalytic activity only under ultraviolet (UV) irradiation. , …”

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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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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Cobalt-doped zinc glycolate as a precursor for the production of Zn1 − xCoxO oxide with nanostructured octahedral particles: synthesis, crystal structure, thermal, spectral, and optical properties

Krasil’nikov,

Tyutyunnik,

Baklanova

et al. 2023

J. Korean Ceram. Soc.

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Syntheses, structural evolution, electrical and optoelectronic characterization of ZnO/CuO composite films doped with transition metal Mn2+ ions

Safdar

Aydın²,

Şahin³

2022

Ceramics International

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Synthesis, structure, optical, voltammetric and photocatalytic properties of manganese-activated ZnO

Cited by 4 publications

References 42 publications

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

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

Cobalt-doped zinc glycolate as a precursor for the production of Zn1 − xCoxO oxide with nanostructured octahedral particles: synthesis, crystal structure, thermal, spectral, and optical properties

Syntheses, structural evolution, electrical and optoelectronic characterization of ZnO/CuO composite films doped with transition metal Mn2+ ions

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Synthesis, structure, optical, voltammetric and photocatalytic properties of manganese-activated ZnO

Cited by 4 publications

References 42 publications

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

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

Cobalt-doped zinc glycolate as a precursor for the production of Zn1 − xCoxO oxide with nanostructured octahedral particles: synthesis, crystal structure, thermal, spectral, and optical properties

Syntheses, structural evolution, electrical and optoelectronic characterization of ZnO/CuO composite films doped with transition metal Mn2+ ions

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

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