Oxygen-doped carbon nitride/red phosphorus composite photocatalysts for effective visible-light-driven purification of wastewater

• Published in: Materials chemistry and physics 2021-05, Vol.264, p.124440, Article 124440
• Main Authors: Guo, Wenting, Li, Jiaojiao, Yang, Yuanyuan, Zhang, Meng, Zhai, Yunpu, Li, Donghui, Zhao, Hao, Liu, Yonggang
• Format: Article
• Language: English
• Subjects: Carbon nitride; Catalytic activity; Heterojunctions; Malachite green; O-doped g-C3N4; Photocatalysis; Photocatalysts; Photocatalytic activity; Photodegradation; Pollutants; Red phosphorus; Room temperature; Type I heterojunction; Wastewater
• ISSN: 0254-0584; 1879-3312
• DOI: 10.1016/j.matchemphys.2021.124440

In this study, broad-spectral-responsive photocatalysts O-doped g-C3N4/Red P (OCN/RP) heterojunctions were prepared by mechanical grinding at room temperature, which is a simple and green synthesis process. The OCN nanosheets are fixed on the red P particles to form intimate I-type heterojunctions. The OCN/RP heterojunctions show extended excitation wavelength to 700 nm and enhanced photocatalytic activity against organic pollutant malachite green (MG). The enhancement benefits from the migration of photogenerated e− from OCN to RP, which facilitates effective charge separation at the interface between OCN and RP. ‧O2−, and ‧OH are proved to be the main active substances of MG photo-degradation on OCN/RP. This experiment provides a general strategy for the preparation of non-metal photocatalysts with broad-spectral responsibility and improved catalytic activity. [Display omitted] •O-doped g-C3N4/red P heterojunction was synthesized by mechanical grinding.•The heterojunction shows wide-spectral responsibility with λex up to 700 nm.•The composite exhibits high photocatalytic activity in degradation of malachite green.•Type I band alignment facilitates charge separation and efficient utilization of photogenerated e− and h+.•‧O2−, and ‧OH are proved to be the main active substances of MG photo-degradation.