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A photocatalytic degradation strategy of PPCPs by heptazine based CN organic polymer (OCN) under visible light

Abstract

Polymeric photocatalysts have desirable application prospects due to their low cost and controllable structures. Here, we report on the synthesis of a highly effective and stable oxygen and nitrogen-linked heptazine based carbon nitride organic polymer (OCN) photocatalyst that is metal-free, porous, with low crystallinity and nitrogen vacancies, which was prepared through a single-step approach. For the photocatalytic degradation of several typical PPCPs, the OCN exhibited excellent photocatalytic performance compared to C3N4. This enhanced mechanisms were novelty investigated, the conduction band, crystallinity and the recombination rate of photogenerated carriers were reduced due to the introduction of oxygen atoms and nitrogen vacancies, whereas fabrication of porous provided additional adsorption sites. Through these processes, the PPCPs, at the first time, are degraded due to reactive species. The mechanism of hydroxyl radical generation in the OCN system was first proposed under this system. The O linkages can form hydrogen bonds with H2O2 to promote the catalytic generation of hydroxyl radicals(•OH). The presence of •OH, O2•- and 1O2 (detected by ESR) indicated that the OCN polymer could be employed to degrade organic pollutants.

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Publication details

The article was received on 07 Jun 2018, accepted on 03 Aug 2018 and first published on 03 Aug 2018


Article type: Paper
DOI: 10.1039/C8EN00608C
Citation: Environ. Sci.: Nano, 2018, Accepted Manuscript
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    A photocatalytic degradation strategy of PPCPs by heptazine based CN organic polymer (OCN) under visible light

    Q. Zhang, P. Chen, C. Tan, T. Chen, M. Zhuo, Z. Xie, F. Wang, H. Liu, Z. Cai, G. Liu and W. Lv, Environ. Sci.: Nano, 2018, Accepted Manuscript , DOI: 10.1039/C8EN00608C

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