Ultrasonically dispersed ultrathin g-C3N4 nanosheet/BaBi2Nb2O9 heterojunction photocatalysts for efficient photocatalytic degradation of organic pollutant
- Authors
- Phadtare, V.D.; Parale, V.G.; Kim, Taehee; Lee, Kyu-Yeon; Kadam, A.N.; Choi, Haryeong; Kim, Younghun; Dhavale, R.P.; Lee, Sang-Wha; Park, Hyung-Ho
- Issue Date
- 5-Dec-2021
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Degradation mechanism; g-C3N4/BaBi2Nb2O9 heterojunction; Ultrasonic dispersion; Ultrathin nanosheets; UV–visible light Photocatalysis
- Citation
- Journal of Alloys and Compounds, v.884
- Journal Title
- Journal of Alloys and Compounds
- Volume
- 884
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/82009
- DOI
- 10.1016/j.jallcom.2021.161037
- ISSN
- 0925-8388
- Abstract
- Here, we present new graphite-like C3N4 (g-C3N4)/BaBi2Nb2O9 composites with remarkable photocatalytic activities under solar light irradiation that were prepared by a facile ultrasonic dispersion method. A heterojunction was formed with Aurivillius type BaBi2Nb2O9 particles and ultrathin g-C3N4 nanosheets, and this composite material was characterized by using several techniques. The ultrathin g-C3N4 nanosheets promoted extensive contact in the heterojunction, as observed by morphological analyses. Moreover, the as-synthesized ultrathin g-C3N4 nanosheets are highly porous with a specific surface area of 141 m2/g. The BaBi2Nb2O9 particles strongly absorb ultraviolet (UV) light whereas, by comparison, g-C3N4 absorbs visible light more effectively, as established by diffuse reflectance spectroscopy DRS analysis. These properties substantially improved the capacity of the as-fabricated g-C3N4/BaBi2Nb2O9 heterojunction to photocatalytically degrade the organic dye Rhodamine B (RhB) under simulated solar light and 40 W UV–visible light irradiation, versus either of the separate components of the heterojunction. Specifically, an optimal composite with approximately 30 wt% BaBi2Nb2O9 content exhibits an apparent reaction rate 0.02056 min−1 for RhB photodegradation under simulated solar light, which was nearly 1.5- and 4.3-fold higher than that of the pristine g-C3N4 and BaBi2Nb2O9 photocatalysts, respectively. In addition, the same composite had an apparent reaction rate of 0.0155 min−1 for RhB photodegradation under 40 W UV-Vis light irradiation, which was approximately 1.4- and 2.8-fold higher than the pristine components. These functionalities are also supported by photoluminescence spectroscopy analyses and photocurrent responses, which indicate a photosynergistic effect for the g-C3N4/BaBi2Nb2O9 heterojunction that enhances photoinduced interfacial charge transfer. © 2021 Elsevier B.V.
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