A novel FeS2@g-C3N4 composite with enhanced photo-Fenton catalytic activity for pollutant degradation. (April 2021)

• Record Type: Journal Article
• Authors: Wei, Bangqi; Wang, Chan; He, Yimin; Ran, Guoxia; Song, Qijun
• Is Part Of: Composites communications. Volume 24(2021)
• Publication Date: 2021-04
• Subjects: Photo-fenton catalysts -- FeS2 -- G-C3N4 -- Heterojunction -- Reactive oxygen species -- Pollutant degradation
• DOI: 10.1016/j.coco.2021.100652
• Languages: English
• ISSNs: 2452-2139

Abstract

Abstract: As a metal-free photocatalyst, graphitic carbon nitride (g-C3 N4 ) has been widely used in organic pollutant degradation. However, its photocatalytic efficiency is restricted by its low absorbance of visible light and rapid electron-hole recombination rate. To enhance the catalytic activity in pollutant degradation, a hybrid photo-Fenton catalyst was prepared by coupling FeS2 with g-C3 N4 via a simple hydrothermal method. Consequently, a huge enhancement in degradation efficiency was observed as the model molecule (RhB) can be completely degraded in 60 min in the presence of 5 mM H2 O2 under visible light irradiation. Furthermore, the catalyst shows a high stability and degradation efficiency even after 5 consecutive runs. The mechanism investigations reveal: (1) the heterostructure between FeS2 and g-C3 N4 can shorten the band gap and accelerate the separation and transportation of photoexcited charge carriers; (2) the formation of the heterostructure can not only boosts Fe 2+ catalyzed ·OH production via H2 O2, but also increases the formation of ·O2 − from O2 ; (3) the generated ·OH and ·O2 − as well as the photoinduced holes have all contributed to the improvement of degradation efficiency. Thus present work provides a promising way of building a highly efficient photo-Fenton catalyst that is applicable in purification of wastewater. Graphical abstract: Image 1 Highlights: Novel FeS2 @g-C3 N4 photo-Fenton catalyst with heterojunction was fabricated. The FeS2 @g-C3 N4 exhibited high efficiency for pollutant degradation. 50 mg/L of RhB could be completely degraded within 60 min visible irradiation. The FeS2 @g-C3 N4 showed the excellent stability and reusability. The reasonable mechanism for RhB degradation was proposed.