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A Novel CoO/PT-CN Composite Catalyst for Photocatalytic Degradation of Diesel Oil

Catalysis Surveys from Asia, ISSN: 1574-9266, Vol: 25, Issue: 2, Page: 148-158
2021
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The photocatalysis of graphtic carbon nitride (g-CN) material has been widely used for the photocatalytic degradation of organic pollutants. However, g-CN still has some drawbacks, such as the high recombination of photo-induced electron–hole pairs and weak absorption of light irradiation. To further improve the photodegradation performance of g-CN, a novel composite photocatalyst (CoO/ PT-CN) has been prepared by using a one-pot calcination method, in which cobalt oxide (CoO) as a cocatalyst are introduced on the rectangular hollow substrate of g-CN (PT-CN), The CoO/PT-CN composite photocatalyst delivers an excellent photodegradation performance for diesel oil under a simulated sunlight. It exhibits a high degradation efficiency of 95.92% after light irradiation for 2 h, which is much higher than that of pristine PT-CN. Free radical capture experiments manifest that the free radical of ·O plays a major role for the photodegradation and main active radicals abide by the sequence: ·O > ·OH > h. Moreover, the CoO/PT-CN composite photocatalyst delivers an excellent cyclic stability, which only degrades 8.71% photodegradation efficiency after 10 cycles. The improvement of CoO/PT-CN composite photocatalyst is ascribed to the formation of a heterojunction between CoO and PT-CN, which promotes the separation of photo-induced carriers. This work paves a new way for the exploration of photocatalyst for the organic pollutant degradation.

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