Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 271, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2020.118933
Keywords
PDI/g-C3N4 composite; n-n Type heterojunction; Visible-light photocatalysis; pi-pi interaction; Charge separation
Funding
- National Natural Science Foundation of China [21707052]
- Jiangsu Agriculture Science and Technology Innovation Fund [CX(18)2025]
- Fundamental Research Funds for the Central Universities [JUSRP11905, JUSRP51714B]
- Key Research and Development Program of Jiangsu Province [BE2017623]
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Herein, perylene diimide (PDI)/oxygen-doped g-C3N4 nanosheets (O-CN) n-n heterojunction photocatalyst was prepared by an in-situ electrostatic assembling. The pi-pi interaction between self-assembled PDI and O-CN could lead to the electron delocalization effect to facilitate the electron migration. Self-assembled PDI could broaden the visible response range of O-CN to produce more photogenerated carries. Moreover, the interlaced band structures of O-CN and self-assembled PDI could result in a built-in electric field to promote the interfacial charge separation. Besides, many active species (h(+), O-center dot(2-) and O-1(2) ) could be accumulated to improve the oxidation ability of PDI/O-CN. Therefore, PDI/O-CN exhibited enhanced visible photocatalytic oxidation activities towards disinfection, degradation and oxygen evolution. The optimum PDI/O-CN inactivated 96.6% of Staphylococcus aureus cells within 3 h, while O-CN only killed 62.2%. Additionally, the phenol degradation rate and evolved oxygen amount in 2 h of PDI/O-CN-40% were 3.6 and 1.8 times as high as those of O-CN, respectively.
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