Details
| Original language | English |
|---|---|
| Pages (from-to) | 1664-1673 |
| Number of pages | 10 |
| Journal | Materials Chemistry Frontiers |
| Volume | 2 |
| Issue number | 9 |
| Publication status | Published - 9 Jul 2018 |
Abstract
In this study, bismuth oxide polymorphs (α and β phases) were synthesized using a post-calcination method using Bi 2O 2CO 3 nanoflakes as an intermediate. These samples were characterized by various spectroscopic techniques such as powder X-ray diffraction, Fourier transform infrared spectroscopy, Raman spectroscopy, UV-visible absorption, photoluminescence studies and microscopic analysis (scanning and transmission electron microscopy). The mechanism of the formation of β-Bi 2O 3 nanoparticles and the α-Bi 2O 3 coral-like morphology has been proposed. Furthermore, the photocatalytic performance of the bismuth oxide polymorphs was investigated via the degradation of organic dyes (rhodamine B, methylene blue, acid orange 7 and methyl orange) under simulated solar illumination. The results show that the β-Bi 2O 3 nanoparticles possess superior photocatalytic activity compared to the α-Bi 2O 3 coral-like morphology for the degradation of these dyes due to a higher photon adsorption (band gap of 2.2 eV for β-Bi 2O 3 and 2.56 eV for α-Bi 2O 3). However, the photocatalytic activity of these bismuth oxide polymorphs for the degradation of organic dyes followed the order of Rh B > AO 7 > MB > MO under identical experimental conditions. A plausible mechanism has been proposed for the photocatalytic activity.
ASJC Scopus subject areas
- Materials Science(all)
- Materials Science(all)
- Materials Chemistry
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In: Materials Chemistry Frontiers, Vol. 2, No. 9, 09.07.2018, p. 1664-1673.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Phase-controlled synthesis of bismuth oxide polymorphs for photocatalytic applications
AU - Selvamani, Thangavel
AU - Anandan, Sambandam
AU - Granone, Luis
AU - Bahnemann, Detlef W.
AU - Ashokkumar, Muthupandian
N1 - Funding information: The research described herein was financially supported by the Department of Science and Technology, India under the Water Technology Initiative scheme (DST/TM/WTI/2k16/258(G)).
PY - 2018/7/9
Y1 - 2018/7/9
N2 - In this study, bismuth oxide polymorphs (α and β phases) were synthesized using a post-calcination method using Bi 2O 2CO 3 nanoflakes as an intermediate. These samples were characterized by various spectroscopic techniques such as powder X-ray diffraction, Fourier transform infrared spectroscopy, Raman spectroscopy, UV-visible absorption, photoluminescence studies and microscopic analysis (scanning and transmission electron microscopy). The mechanism of the formation of β-Bi 2O 3 nanoparticles and the α-Bi 2O 3 coral-like morphology has been proposed. Furthermore, the photocatalytic performance of the bismuth oxide polymorphs was investigated via the degradation of organic dyes (rhodamine B, methylene blue, acid orange 7 and methyl orange) under simulated solar illumination. The results show that the β-Bi 2O 3 nanoparticles possess superior photocatalytic activity compared to the α-Bi 2O 3 coral-like morphology for the degradation of these dyes due to a higher photon adsorption (band gap of 2.2 eV for β-Bi 2O 3 and 2.56 eV for α-Bi 2O 3). However, the photocatalytic activity of these bismuth oxide polymorphs for the degradation of organic dyes followed the order of Rh B > AO 7 > MB > MO under identical experimental conditions. A plausible mechanism has been proposed for the photocatalytic activity.
AB - In this study, bismuth oxide polymorphs (α and β phases) were synthesized using a post-calcination method using Bi 2O 2CO 3 nanoflakes as an intermediate. These samples were characterized by various spectroscopic techniques such as powder X-ray diffraction, Fourier transform infrared spectroscopy, Raman spectroscopy, UV-visible absorption, photoluminescence studies and microscopic analysis (scanning and transmission electron microscopy). The mechanism of the formation of β-Bi 2O 3 nanoparticles and the α-Bi 2O 3 coral-like morphology has been proposed. Furthermore, the photocatalytic performance of the bismuth oxide polymorphs was investigated via the degradation of organic dyes (rhodamine B, methylene blue, acid orange 7 and methyl orange) under simulated solar illumination. The results show that the β-Bi 2O 3 nanoparticles possess superior photocatalytic activity compared to the α-Bi 2O 3 coral-like morphology for the degradation of these dyes due to a higher photon adsorption (band gap of 2.2 eV for β-Bi 2O 3 and 2.56 eV for α-Bi 2O 3). However, the photocatalytic activity of these bismuth oxide polymorphs for the degradation of organic dyes followed the order of Rh B > AO 7 > MB > MO under identical experimental conditions. A plausible mechanism has been proposed for the photocatalytic activity.
UR - http://www.scopus.com/inward/record.url?scp=85052594880&partnerID=8YFLogxK
U2 - 10.1039/c8qm00221e
DO - 10.1039/c8qm00221e
M3 - Article
VL - 2
SP - 1664
EP - 1673
JO - Materials Chemistry Frontiers
JF - Materials Chemistry Frontiers
IS - 9
ER -