Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 7, Issue 10, Pages 9699-9708Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.9b01477
Keywords
g-C3N4 nanosheet; CeO2; Heterostructure; Visible light; Photodegradation
Categories
Funding
- National Key Research and Development Program of China [2018YFC1900105]
- NSFC [21836001, 21607042]
- Fundamental Research Funds from the Central Universities [2018ZD11]
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Photodegradation has been considered as an efficient environmental remediation technology to eliminate organic pollutants from wastewater, and the calling for high-performance photocatalysts is endless. Herein, we developed an efficient solid-state thermolysis route for the mass production of type-II CeO2/g-C3N4 nanosheet (CeO2/CNNS) serving as efficient photocatalysts toward bisphenol A (BPA) degradation under visible light illumination. The microstructures, compositions, and optical properties of the obtained samples were characterized by multitechniques, and n-n heterojunction was verified to be perfectly formed in CeO2/CNNS with an intimate contact interface. A total of 93.7% BPA was removed by the optimal CeO2/CNNS composites after 80 min visible light irradiation, but only 65.0% and 14.4% of the BPA were removed by CNNS and CeO2, respectively. It was mainly attributed to the matched energy levels of the CeO2/CNNS heterostructure, which facilitated the migration and separation of photoinduced charge carriers. Combining trapping experiments and ESR analysis, the results indicated that holes (h(+)) and superoxide radicals (O-2(center dot-)) dominated the photodegradation reactions. As expected, the CeO2/CNNS composites still remained stable up to the sixth cycling test, implying the possible application for actual wastewater treatment. This work highlighted the mechanism of CeO2/CNNS composites and gained a deeper insight for the fabrication of heterojunction catalysts and their application in environmental pollution management.
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