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NNU research group revealed new mechanism of visible light absorption by perylene diimide for synergistic persulfate activation

Recently, the results of research on photocatalytic coupling of a persulfate system by the environmental behavior of pollutants and pollution control research group from the School of Environment was published online in AppliedCatalyst B:Environmental with the title of "Visible Light Absorption by Perylene Diimide for Synergic Persulfate Activation Toward Efficient Photodegradation of Biphenol A". AppliedCatalyst B:Environmental is one of the top international journals in the environmental field. In 2020, its cite score is 25.3 and its impact factor is 16.683. Qiuyi Ji, a 2018 doctoral student, is the first author of the paper, and Professor Huan He and Professor Shaogui Yang are the co-corresponding authors. This paper is also the first high-level paper published in this journal with the names of the team from this school as first author and corresponding authors since the establishment of the school. The link to the paper is as follows: https://doi.org/10.1016/j.apcatb.2020.119579.

The research team has constructed a novel perylene diimide/persulfate/visible light (PDI/PS/VIS) system. With different degree of self-assembly of PDI as the research object and bisphenol A as the target pollutant, the research team has further clarified a new mechanism of supramolecular activation of persulfate under visible light. The results show that PDI with a different degree of self-assembly will affect the layer spacing, oxygen content, dispersion, electronegativity, band gap width and the separation efficiency of electrons and holes, resulting in a change of photocatalytic activity. PDI/PS/Vis system can produce a variety of free radicals, a chain reaction and a mutual conversion reaction, to finally convert bisphenol A into non-toxic ring-opening end product. Moreover, PDI/PS/Vis system also shows the effective performance of degrading phenol and 2,4-dichlorophenol. In addition, the self-assembled PDI photocatalyst has high stability and recyclability. Therefore, the PDI/PS/Vis system can provide a new method for the degradation of organic micro pollutants in wastewater.

This research was funded by the six talent summit plan of Jiangsu Province(No. JNHB-059) and the postgraduate scientific research practice innovation plan of Jiangsu Province(KYCX19_0818), the Natural Science Foundation of Jiangsu Province(BK20190713, BK20190718) and the National Natural Science Foundation of China(21777067, 51908293).

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