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Title: Bandgap Engineering in a Staggered-Type Oxide Perovskite Heterojunction for Efficient Visible Light-Driven Photocatalytic Dye Degradation
Authors: Purohit S.
Yadav, Kamlesh Kumar
Satapathi, Soumitra
Published in: Langmuir
Abstract: Oxide perovskite materials with ABO3 structure have been widely employed for photocatalytic applications. However, owing to the disadvantageous electron-hole recombination process and wide bandgap of some materials, the photocatalytic performance is seemingly restricted. Coupling two catalysts together through the formation of a heterojunction ensures effective charge carrier separation. The intimate interaction between the materials is propitiously useful for charge transfer, thereby increasing the efficacy. In this study, the photocatalytic activity of a KxNa(1-x)NbO3-BaBiO3 (KNN-BBO) heterojunction material for the degradation of Rhodamine 6G organic dye was investigated. The materials were extensively characterized by X-ray diffraction, UV-Vis diffused reflectance spectroscopy, X-ray photoelectron spectroscopy, Raman spectroscopy, and N2 adsorption isotherms. The degradation efficiency of the organic contaminant under 1 sun simulated sunlight is monitored by spectral analysis from UV-Vis absorption spectroscopy. The resistance to charge transfer was also observed by electrochemical impedance spectroscopy. The effect of the sintering temperature on the photoinduced degradation activity was also included in our study. An unsintered KNN-BBO (UKB) composite material is found to be the most efficient catalyst with 84% removal efficiency as compared to the sintered one (SKB). This is attributed to the reduced bandgap with staggered-type band alignment, increased surface area, and surface oxygen vacancy states. Together with the crucial findings of this work, a probable mechanism for enhanced photocatalytic activity has been proposed here. © 2021 American Chemical Society.
Citation: Langmuir, 37(11): 3467-3476
Issue Date: 2021
Publisher: American Chemical Society
Keywords: Absorption spectroscopy
Barium compounds
Bismuth compounds
Charge transfer
Electrochemical impedance spectroscopy
Energy gap
Niobium compounds
Sodium compounds
Spectrum analysis
Ultraviolet spectroscopy
X ray photoelectron spectroscopy
Degradation efficiency
Electron hole recombination process
Photocatalytic application
Photocatalytic dye degradations
Photocatalytic performance
Photoinduced degradation
Surface oxygen vacancies
UV-Vis absorption spectroscopy
Photocatalytic activity
ISSN: 7437463
Author Scopus IDs: 57217678071
Author Affiliations: Purohit, S., Department of Physics, Indian Institute of Technology Roorkee, Haridwar, Roorkee, Uttarakhand, 247667, India
Yadav, K.L., Department of Physics, Indian Institute of Technology Roorkee, Haridwar, Roorkee, Uttarakhand, 247667, India
Satapathi, S., Department of Physics, Indian Institute of Technology Roorkee, Haridwar, Roorkee, Uttarakhand, 247667, India
Funding Details: S.P. would like to acknowledge Dr. Amarnath Bheemaraju from BML Munjal University for his help in Raman experiments. S.S. would like to acknowledge MeitY Research Grant DIC-1377-PHY. Ministry of Electronics and Information technology, Meity: DIC-1377-PHY
Corresponding Author: Satapathi, S.; Department of Physics, India; email:
Appears in Collections:Journal Publications [PH]

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