G-C3N4/BiOI S‑scheme heterojunction: A 2D/2D model platform for visible-light-driven photocatalytic CO2 reduction and pollutant degradation. Issue 4 (August 2022)

• Record Type: Journal Article
• Authors: Li, Hongji; Wang, Dandan; Miao, Chun; xia, Fengwu; Wang, Yubo; Wang, Yutong; Liu, Chunbo; Che, Guangbo
• Is Part Of: Journal of environmental chemical engineering. Volume 10:Issue 4(2022)
• Publication Date: 2022-08
• Subjects: Visible light -- Photocatalysis -- BiOI nanoplates -- G-C3N4 nanosheets -- S-scheme; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2022.108201
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: Photo-degradation of pollutant and photo-reduction of CO2 are efficient ways to address challenges of water pollution, the greenhouse effect and energy crisis, respectively. In our work, via fastening two-dimensional (2D) BiOI nanoplates on 2D g-C3 N4 nanosheets, a BiOI/g-C3 N4 (BI/CN) S-scheme photocatalyst with closely stacked structure were prepared though a self-assembly process. The prepared BI/CN S-scheme heterojunction could improve the transfer and separation efficiency of photo-generated electron-hole pairs by facilitating the electrons transfer from BiOI to g-C3 N4 . Under visible light exposure, the photo-degradation efficiencies of tetracycline hydrochloride (TC) and p-chlorophenol (4-PC) by BI/CN-50% reached nearly 100% and 46%, respectively, which were more excellent in comparison with other samples. And BI/CN-50% sample exhibited the best CO production (12.45 μmol∙g −1 ) with visible-light irradiation of 4 h. This value was approximately 4.37 and 5.41 times higher than that of BI (2.85 μmol∙g −1 ) and CN materials (2.30 μmol∙g −1 ), respectively. Moreover, the excellent photocatalytic performance had no visible decay during five cycles. Meanwhile, an S-scheme charge transfer process was confirmed by species trapping experiments and electron spin-trap analysis. This study offers new insights into the activity, kinetics, and mechanism over BiOI-based materials for photocatalysis technology. Graphical Abstract: The prepared visible-light driven 2D/2D S-Scheme BiOI/g-C3 N4 platform by loading BiOI nanoplates onto g-C3 N4 nanosheets, exhibiting enhanced activity during TC degradation and CO2 reduction. ga1 Highlights: 2D/2D BiOI/g-C3 N4 heterostructure with enhanced interfacial charge separation was prepared. The S-scheme charges transfer of 2D/2D BiOI/g-C3 N4 photocatalyst was unveiled BiOI/g-C3 N4 showed superior photocatalytic performance of CO2 reduction and pollutant degradation.