Solid-State Synthesis, Characterization, UV-Induced Coloration and Photocatalytic Activity – The Sr6Bi2O11, Sr3Bi2O6 and Sr2Bi2O5 Bismuthates

Dmitry S. Shtarev, A.V. Shtareva, V.K. Ryabchuk, A.V. Rudakova, P.D. Murzin, Maxim Molokeev, A.V. Koroleva, A.I. Blokh, Nick Serpone

Результат исследований: Научные публикации в периодических изданияхстатья

4 Цитирования (Scopus)

Выдержка

This article reports on two novel strontium bismuthate photocatalysts (Sr 6Bi 2O 11 and Sr 3Bi 2O 6) prepared by a solid-state synthesis for which the number of strontium atoms exceeds the number of bismuth atoms in the cation sublattice; for comparison, the bismuthate Sr 2Bi 2O 5 was also re-examined. All three bismuthates were characterized by a variety of spectroscopic techniques (XRD, XPS, EDX, DR, Raman, SEM, and EIS). Direct bandgap energies for the three bismuthates were assessed from diffuse reflectance spectra: 2.61 eV for Sr 6Bi 2O 11; 3.40 eV for Sr 3Bi 2O 6; 3.17 eV for Sr 2Bi 2O 5, while the flatband potentials (versus NHE) of the corresponding valence bands were estimated from XPS spectra: +2.22 eV for Sr 6Bi 2O 11; +1.71 eV for Sr 3Bi 2O 6; +1.61 eV for Sr 2Bi 2O 5. The two novel bismuthates displayed photocatalytic activity toward the photodegradation of acetaldehyde in the gas phase and phenol in aqueous media, with the Sr 6Bi 2O 11 system exhibiting significantly greater photoactivity vis-à-vis the Sr 3Bi 2O 6 bismuthate; by comparison, Sr 2Bi 2O 5 was photocatalytically inactive in this case; their photoactivity was also assessed from the photodegradation of phenol in aqueous media (in all cases using UV-Vis irradiation from a Xe light source). Detailed photocatalytic mechanisms are proposed based on UV-induced coloration studies (carried out using a high-pressure Hg lamp; 365 nm) and on the photodegradation in the presence of radical scavengers to explain how composition and structure of the three bismuthates affect their photocatalytic activity. The role of point defects (oxygen vacancies) in their crystal lattice is described as they affect photocatalytic activity by acting as electron traps and potentially as electron/hole recombination centers.

Язык оригиналаанглийский
Страницы (с-по)70-85
Число страниц16
ЖурналCatalysis Today
Том340
DOI
СостояниеОпубликовано - 15 янв 2020

Отпечаток

Photodegradation
Strontium
Phenol
Phenols
X ray photoelectron spectroscopy
Atoms
Electron traps
Bismuth
Acetaldehyde
Point defects
Oxygen vacancies
Photocatalysts
Valence bands
Electric lamps
Crystal lattices
Light sources
Cations
Energy dispersive spectroscopy
Energy gap
Gases

Предметные области Scopus

  • Катализ
  • Химия (все)

Цитировать

@article{632e1e46a5474b48ae9d0b8245efe871,
title = "Solid-State Synthesis, Characterization, UV-Induced Coloration and Photocatalytic Activity – The Sr6Bi2O11, Sr3Bi2O6 and Sr2Bi2O5 Bismuthates",
abstract = "This article reports on two novel strontium bismuthate photocatalysts (Sr 6Bi 2O 11 and Sr 3Bi 2O 6) prepared by a solid-state synthesis for which the number of strontium atoms exceeds the number of bismuth atoms in the cation sublattice; for comparison, the bismuthate Sr 2Bi 2O 5 was also re-examined. All three bismuthates were characterized by a variety of spectroscopic techniques (XRD, XPS, EDX, DR, Raman, SEM, and EIS). Direct bandgap energies for the three bismuthates were assessed from diffuse reflectance spectra: 2.61 eV for Sr 6Bi 2O 11; 3.40 eV for Sr 3Bi 2O 6; 3.17 eV for Sr 2Bi 2O 5, while the flatband potentials (versus NHE) of the corresponding valence bands were estimated from XPS spectra: +2.22 eV for Sr 6Bi 2O 11; +1.71 eV for Sr 3Bi 2O 6; +1.61 eV for Sr 2Bi 2O 5. The two novel bismuthates displayed photocatalytic activity toward the photodegradation of acetaldehyde in the gas phase and phenol in aqueous media, with the Sr 6Bi 2O 11 system exhibiting significantly greater photoactivity vis-{\`a}-vis the Sr 3Bi 2O 6 bismuthate; by comparison, Sr 2Bi 2O 5 was photocatalytically inactive in this case; their photoactivity was also assessed from the photodegradation of phenol in aqueous media (in all cases using UV-Vis irradiation from a Xe light source). Detailed photocatalytic mechanisms are proposed based on UV-induced coloration studies (carried out using a high-pressure Hg lamp; 365 nm) and on the photodegradation in the presence of radical scavengers to explain how composition and structure of the three bismuthates affect their photocatalytic activity. The role of point defects (oxygen vacancies) in their crystal lattice is described as they affect photocatalytic activity by acting as electron traps and potentially as electron/hole recombination centers.",
keywords = "Photocatalysts, Photocatalytic activity, Strontium bismuthates, UV-induced coloration",
author = "Shtarev, {Dmitry S.} and A.V. Shtareva and V.K. Ryabchuk and A.V. Rudakova and P.D. Murzin and Maxim Molokeev and A.V. Koroleva and A.I. Blokh and Nick Serpone",
year = "2020",
month = "1",
day = "15",
doi = "10.1016/j.cattod.2018.09.035}",
language = "English",
volume = "340",
pages = "70--85",
journal = "Catalysis Today",
issn = "0920-5861",
publisher = "Elsevier",

}

Solid-State Synthesis, Characterization, UV-Induced Coloration and Photocatalytic Activity – The Sr6Bi2O11, Sr3Bi2O6 and Sr2Bi2O5 Bismuthates. / Shtarev, Dmitry S.; Shtareva, A.V. ; Ryabchuk, V.K.; Rudakova, A.V.; Murzin, P.D.; Molokeev, Maxim; Koroleva, A.V.; Blokh, A.I.; Serpone, Nick.

В: Catalysis Today, Том 340, 15.01.2020, стр. 70-85.

Результат исследований: Научные публикации в периодических изданияхстатья

TY - JOUR

T1 - Solid-State Synthesis, Characterization, UV-Induced Coloration and Photocatalytic Activity – The Sr6Bi2O11, Sr3Bi2O6 and Sr2Bi2O5 Bismuthates

AU - Shtarev, Dmitry S.

AU - Shtareva, A.V.

AU - Ryabchuk, V.K.

AU - Rudakova, A.V.

AU - Murzin, P.D.

AU - Molokeev, Maxim

AU - Koroleva, A.V.

AU - Blokh, A.I.

AU - Serpone, Nick

PY - 2020/1/15

Y1 - 2020/1/15

N2 - This article reports on two novel strontium bismuthate photocatalysts (Sr 6Bi 2O 11 and Sr 3Bi 2O 6) prepared by a solid-state synthesis for which the number of strontium atoms exceeds the number of bismuth atoms in the cation sublattice; for comparison, the bismuthate Sr 2Bi 2O 5 was also re-examined. All three bismuthates were characterized by a variety of spectroscopic techniques (XRD, XPS, EDX, DR, Raman, SEM, and EIS). Direct bandgap energies for the three bismuthates were assessed from diffuse reflectance spectra: 2.61 eV for Sr 6Bi 2O 11; 3.40 eV for Sr 3Bi 2O 6; 3.17 eV for Sr 2Bi 2O 5, while the flatband potentials (versus NHE) of the corresponding valence bands were estimated from XPS spectra: +2.22 eV for Sr 6Bi 2O 11; +1.71 eV for Sr 3Bi 2O 6; +1.61 eV for Sr 2Bi 2O 5. The two novel bismuthates displayed photocatalytic activity toward the photodegradation of acetaldehyde in the gas phase and phenol in aqueous media, with the Sr 6Bi 2O 11 system exhibiting significantly greater photoactivity vis-à-vis the Sr 3Bi 2O 6 bismuthate; by comparison, Sr 2Bi 2O 5 was photocatalytically inactive in this case; their photoactivity was also assessed from the photodegradation of phenol in aqueous media (in all cases using UV-Vis irradiation from a Xe light source). Detailed photocatalytic mechanisms are proposed based on UV-induced coloration studies (carried out using a high-pressure Hg lamp; 365 nm) and on the photodegradation in the presence of radical scavengers to explain how composition and structure of the three bismuthates affect their photocatalytic activity. The role of point defects (oxygen vacancies) in their crystal lattice is described as they affect photocatalytic activity by acting as electron traps and potentially as electron/hole recombination centers.

AB - This article reports on two novel strontium bismuthate photocatalysts (Sr 6Bi 2O 11 and Sr 3Bi 2O 6) prepared by a solid-state synthesis for which the number of strontium atoms exceeds the number of bismuth atoms in the cation sublattice; for comparison, the bismuthate Sr 2Bi 2O 5 was also re-examined. All three bismuthates were characterized by a variety of spectroscopic techniques (XRD, XPS, EDX, DR, Raman, SEM, and EIS). Direct bandgap energies for the three bismuthates were assessed from diffuse reflectance spectra: 2.61 eV for Sr 6Bi 2O 11; 3.40 eV for Sr 3Bi 2O 6; 3.17 eV for Sr 2Bi 2O 5, while the flatband potentials (versus NHE) of the corresponding valence bands were estimated from XPS spectra: +2.22 eV for Sr 6Bi 2O 11; +1.71 eV for Sr 3Bi 2O 6; +1.61 eV for Sr 2Bi 2O 5. The two novel bismuthates displayed photocatalytic activity toward the photodegradation of acetaldehyde in the gas phase and phenol in aqueous media, with the Sr 6Bi 2O 11 system exhibiting significantly greater photoactivity vis-à-vis the Sr 3Bi 2O 6 bismuthate; by comparison, Sr 2Bi 2O 5 was photocatalytically inactive in this case; their photoactivity was also assessed from the photodegradation of phenol in aqueous media (in all cases using UV-Vis irradiation from a Xe light source). Detailed photocatalytic mechanisms are proposed based on UV-induced coloration studies (carried out using a high-pressure Hg lamp; 365 nm) and on the photodegradation in the presence of radical scavengers to explain how composition and structure of the three bismuthates affect their photocatalytic activity. The role of point defects (oxygen vacancies) in their crystal lattice is described as they affect photocatalytic activity by acting as electron traps and potentially as electron/hole recombination centers.

KW - Photocatalysts

KW - Photocatalytic activity

KW - Strontium bismuthates

KW - UV-induced coloration

UR - http://www.scopus.com/inward/record.url?scp=85055442428&partnerID=8YFLogxK

U2 - 10.1016/j.cattod.2018.09.035}

DO - 10.1016/j.cattod.2018.09.035}

M3 - Article

VL - 340

SP - 70

EP - 85

JO - Catalysis Today

JF - Catalysis Today

SN - 0920-5861

ER -