TY - JOUR
T1 - In situ synthesis of α-β phase heterojunction on Bi2O3 nanowires with exceptional visible-light photocatalytic performance
AU - Hou, Jungang
AU - Yang, Chao
AU - Wang, Zheng
AU - Zhou, Weilin
AU - Jiao, Shuqiang
AU - Zhu, Hongmin
N1 - Funding Information:
This work was supported by National Science Foundation of China (No. 51102015 , 21071014 and 51004008 ), the Fundamental Research Funds for the Central Universities (No. FRF-AS-11-002A and FRF-TP-12-023A ), Research Fund for the Doctoral Program of Higher Education of China (No. 20110006120027 ), National High Technology Research and Development Program of China (863 Program, No. 2012AA062302 ), National Basic Research Program of China (973 Program, No. 2007CB613301 ), the Program for New Century Excellent Talents in University ( NCET-11-0577 ) and the 111 Project (B13004).
PY - 2013/10
Y1 - 2013/10
N2 - Visible-light-responsive α-β phase heterojunction on Bi2O3 nanowire photocatalysts were prepared via a facile in situ hydrothermal process in assistance with the post-heat treatment route. The as-prepared samples were characterized by X-ray diffraction (XRD), electron microscope (EM), Brunauer-Emmett-Teller analysis (BET), X-ray photoelectron spectroscopy (XPS), and UV-vis diffuse reflectance absorption spectra (UV-vis). XRD patterns revealed that the α-β phase heterojunction over Bi2O3 composites with the monoclinic α-Bi2O3 and the tetragonal β-Bi2O3 structure were obtained and the relative ratios between α-Bi2O3 and β-Bi2O3 can readily be tailored by the control of the reaction temperature. Within the hydrothermal temperature range, the morphology of as-prepared samples transformed progressively from two-dimensional β-Bi2O3 sheets to the α-/β-Bi2O3 nanowires junction. The exceptional photocatalytic performance of α-/β-Bi2O3 heterojunction for the degradation of cationic rhodamine B and anionic methyl orange under visible-light irradiation is superior over that of β-Bi2O3 sheets, which is ascribed to the efficient charge separation and transfer across the α-β phase junction. The phase-junction approach will open new avenues for the development of efficient photocatalysts for environmental remediation and energy conversion.
AB - Visible-light-responsive α-β phase heterojunction on Bi2O3 nanowire photocatalysts were prepared via a facile in situ hydrothermal process in assistance with the post-heat treatment route. The as-prepared samples were characterized by X-ray diffraction (XRD), electron microscope (EM), Brunauer-Emmett-Teller analysis (BET), X-ray photoelectron spectroscopy (XPS), and UV-vis diffuse reflectance absorption spectra (UV-vis). XRD patterns revealed that the α-β phase heterojunction over Bi2O3 composites with the monoclinic α-Bi2O3 and the tetragonal β-Bi2O3 structure were obtained and the relative ratios between α-Bi2O3 and β-Bi2O3 can readily be tailored by the control of the reaction temperature. Within the hydrothermal temperature range, the morphology of as-prepared samples transformed progressively from two-dimensional β-Bi2O3 sheets to the α-/β-Bi2O3 nanowires junction. The exceptional photocatalytic performance of α-/β-Bi2O3 heterojunction for the degradation of cationic rhodamine B and anionic methyl orange under visible-light irradiation is superior over that of β-Bi2O3 sheets, which is ascribed to the efficient charge separation and transfer across the α-β phase junction. The phase-junction approach will open new avenues for the development of efficient photocatalysts for environmental remediation and energy conversion.
KW - Bismuth oxide
KW - Charge transfer
KW - Heterojunction
KW - Photocatalysis
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U2 - 10.1016/j.apcatb.2013.05.050
DO - 10.1016/j.apcatb.2013.05.050
M3 - Article
AN - SCOPUS:84879534016
VL - 142-143
SP - 504
EP - 511
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
SN - 0926-3373
ER -