期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 421, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.126634
关键词
Sheet-on-sheet heterojunction; Ultrathin TiO2 nanosheets; Built-in electric field; Photocatalytic degradation; Amoxicillin
资金
- Scientific Research Foundation of Graduate School of Nanjing University [CXYJ21-41]
- National Natural Science Foundation of China [21876078]
- Major Science and Technology Program for Water Pollution Control and Treatment [2017ZX07204004]
- Jiangsu Key RD Plan [BE2017711]
Developing sheet-on-sheet (2D/2D) heterostructure with built-in electric field (BIEF) effectively enhances the performance of photocatalysts for degrading emerging contaminants. The TiO2/Bi2MoO6 photocatalyst demonstrated higher efficiency in photocatalytic degradation of amoxicillin compared to individual TiO2 and Bi2MoO6, showing the potential for unique 2D/2D heterostructure photocatalysts in pollutant removal.
Developing sheet-on-sheet (2D/2D) heterostructure with built-in electric field (BIEF) is effective in boosting the performance of photocatalysts for emerging contaminants degradation. Herein, the 2D/2D microtopography and (-)TiO2/(+)Bi2MoO6 BIEF were precisely integrated into hierarchical nanosheets, which can provide the basis and driving force for charge transfer both in in-plane and interface of heterojunction. The prepared photocatalyst (TiO2/Bi2MoO6) showed high-efficiency and stable performance for photocatalytic amoxicillin (AMX) degradation, which was 18.2 and 5.7 times higher than TiO2 and Bi2MoO6, respectively. More importantly, TiO2/Bi2MoO6 showed more efficient photocatalytic activity and photogenerated charge separation than TiO2@Bi2-MoO6 (different morphology). Besides, four possible pathways of AMX degradation were proposed depending on Gaussian calculations and intermediates analysis by GC-MS and HPLC-TOFMS. This work sheds light on the design and construction of unique 2D/2D heterostructure photocatalysts for AMX degradation.
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