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Title: Ionic-Liquid-Assisted Microwave Synthesis of Solid Solutions of Sr 1–xBa xSnO 3 Perovskite for Photocatalytic Applications

Nanocrystalline Sr 1–xBa xSnO 3 (x = 0, 0.2, 0.4, 0.8, 1) perovskite photocatalysts were prepared by microwave synthesis in an ionic liquid (IL) and subsequent heat-treatment. The influence of the Sr/Ba substitution on the structure, crystallization, morphology, and photocatalytic efficiency was investigated and the samples were fully characterized. On the basis of X-ray diffraction results, as the Ba content in the SrSnO 3 lattice increases, a symmetry increase was observed from the orthorhombic perovskite structure for SrSnO 3 to the cubic BaSnO 3 structure. The analysis of the sample morphology by SEM reveals that the Sr 1–xBa xSnO 3 samples favor the formation of nanorods (500 nm–5 μm in diameter and several micrometers long). The photophysical properties were examined by UV/Vis diffuse reflectance spectroscopy. The band gap decreases from 3.85 to 3.19 eV with increasing Ba 2+ content. Furthermore, the photocatalytic properties were evaluated for the hydroxylation of terephthalic acid (TA). The order of the activities for TA hydroxylation was Sr 0.8Ba 0.2SnO 3 > SrSnO 3 > BaSnO 3 > Sr 0.6Ba 0.4SnO 3 > Sr 0.2Ba 0.8SnO 3. Here, the highest photocatalytic activity was observed for Sr 0.8Ba 0.2SnO 3, and this can be attributed to themore » synergistic impacts of the modification of the crystal structure and morphology, the relatively large surface area associated with the small crystallite size, and the suitable band gap and band-edge position.« less
Authors:
 [1] ;  [2] ;  [2] ; ORCiD logo [3]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States)
  2. Ames Lab., Ames, IA (United States)
  3. Ames Lab. and Iowa State Univ., Ames, IA (United States); Stockholm Univ., Stockholm (Sweden)
Publication Date:
Report Number(s):
IS-J-9454
Journal ID: ISSN 1864-5631
Grant/Contract Number:
AC02-07CH11358
Type:
Accepted Manuscript
Journal Name:
ChemSusChem
Additional Journal Information:
Journal Volume: 10; Journal Issue: 17; Journal ID: ISSN 1864-5631
Publisher:
ChemPubSoc Europe
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; barium; ionic liquids; microwave chemistry; perovskite phases; strontium
OSTI Identifier:
1396275

Alammar, Tarek, Slowing, Igor I., Anderegg, Jim, and Mudring, Anja -Verena. Ionic-Liquid-Assisted Microwave Synthesis of Solid Solutions of Sr1–xBaxSnO3 Perovskite for Photocatalytic Applications. United States: N. p., Web. doi:10.1002/cssc.201700615.
Alammar, Tarek, Slowing, Igor I., Anderegg, Jim, & Mudring, Anja -Verena. Ionic-Liquid-Assisted Microwave Synthesis of Solid Solutions of Sr1–xBaxSnO3 Perovskite for Photocatalytic Applications. United States. doi:10.1002/cssc.201700615.
Alammar, Tarek, Slowing, Igor I., Anderegg, Jim, and Mudring, Anja -Verena. 2017. "Ionic-Liquid-Assisted Microwave Synthesis of Solid Solutions of Sr1–xBaxSnO3 Perovskite for Photocatalytic Applications". United States. doi:10.1002/cssc.201700615. https://www.osti.gov/servlets/purl/1396275.
@article{osti_1396275,
title = {Ionic-Liquid-Assisted Microwave Synthesis of Solid Solutions of Sr1–xBaxSnO3 Perovskite for Photocatalytic Applications},
author = {Alammar, Tarek and Slowing, Igor I. and Anderegg, Jim and Mudring, Anja -Verena},
abstractNote = {Nanocrystalline Sr1–xBaxSnO3 (x = 0, 0.2, 0.4, 0.8, 1) perovskite photocatalysts were prepared by microwave synthesis in an ionic liquid (IL) and subsequent heat-treatment. The influence of the Sr/Ba substitution on the structure, crystallization, morphology, and photocatalytic efficiency was investigated and the samples were fully characterized. On the basis of X-ray diffraction results, as the Ba content in the SrSnO3 lattice increases, a symmetry increase was observed from the orthorhombic perovskite structure for SrSnO3 to the cubic BaSnO3 structure. The analysis of the sample morphology by SEM reveals that the Sr1–xBaxSnO3 samples favor the formation of nanorods (500 nm–5 μm in diameter and several micrometers long). The photophysical properties were examined by UV/Vis diffuse reflectance spectroscopy. The band gap decreases from 3.85 to 3.19 eV with increasing Ba2+ content. Furthermore, the photocatalytic properties were evaluated for the hydroxylation of terephthalic acid (TA). The order of the activities for TA hydroxylation was Sr0.8Ba0.2SnO3 > SrSnO3 > BaSnO3 > Sr0.6Ba0.4SnO3 > Sr0.2Ba0.8SnO3. Here, the highest photocatalytic activity was observed for Sr0.8Ba0.2SnO3, and this can be attributed to the synergistic impacts of the modification of the crystal structure and morphology, the relatively large surface area associated with the small crystallite size, and the suitable band gap and band-edge position.},
doi = {10.1002/cssc.201700615},
journal = {ChemSusChem},
number = 17,
volume = 10,
place = {United States},
year = {2017},
month = {6}
}