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. 2022 Jun:615:849-864.
doi: 10.1016/j.jcis.2022.02.003. Epub 2022 Feb 4.

Perylene diimide supermolecule (PDI) as a novel and highly efficient cocatalyst for photocatalytic degradation of tetracycline in water: A case study of PDI decorated graphitic carbon nitride/bismuth tungstate composite

Wenwu Zhou  1 , Bing Yang  2 , Guo Liu  3 , Chenmin Xu  4 , Qiuyi Ji  2 , Weiming Xiang  2 , Dunyu Sun  2 , Qiang Zhong  2 , Huan He  2 , Liu Yazi  2 , Zhe Xu  2 , Chengdu Qi  2 , Shiyin Li  2 , Shaogui Yang  5
Affiliations

Perylene diimide supermolecule (PDI) as a novel and highly efficient cocatalyst for photocatalytic degradation of tetracycline in water: A case study of PDI decorated graphitic carbon nitride/bismuth tungstate composite

Wenwu Zhou et al. J Colloid Interface Sci. 2022 Jun.

Abstract

Employing perylene diimide supermolecule (PDI) as metal-free cocatalyst, a novel PDI/g-C3N4/Bi2WO6 (PCB) photocatalyst was constructed for the effective degradation of antibiotics. Both the photocatalytic activity and photostability of g-C3N4/Bi2WO6 (gCB) were further improved after loading PDI. Under simulated sunlight illumination, the apparent rate constant of tetracycline (TC) degradation by PCB reached 2.6 times that of gCB. The photocatalytic activity of PCB still kept over 80% after 4 cycle experiments, while gCB only remained around 21%. The superior activity of PCB was ascribed to the synergism between the extended visible light absorption range through the participation of PDI cocatalyst and facilitated gCB-to-PDI photoelectron transfer. TC would finally be transformed into non-toxic ring opening products and mineralized. This work demonstrated that PDI was an excellent metal-free cocatalyst and exhibited great potential to boost the activity of photocatalysts.

Keywords: Metal-free cocatalyst; PDI/g-C(3)N(4)/Bi(2)WO(6) (PCB); Perylene diimide supermolecule; Photocatalytic mechanism; Tetracycline degradation.

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Conflict of interest statement

Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.