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 CeO 2 /g-C 3 N 4 nanosheet (CeO 2 /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 CeO 2 /CNNS with an intimate contact interface. A total of 93.7% BPA was removed by the optimal CeO 2 /CNNS composites after 80 min visible light irradiation, but only 65.0% and 14.4% of the BPA were removed by CNNS and CeO 2, respectively. It was mainly attributed to the matched energy levels of the CeO 2 /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 •– ) dominated the photodegradation reactions. As expected, the CeO 2 /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 CeO 2 /CNNS composites and gained a deeper insight for the fabrication of heterojunction catalysts and their application in environmental pollution management.
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Ma et al. (2019) studied this question.
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