3D/2D Fe2O3/g-C3N4 Z-scheme heterojunction catalysts for fast, effective and stable photo Fenton degradation of azo dyes. Issue 5 (October 2021)

• Record Type: Journal Article
• Authors: Wang, Liyan; Wang, Ye; Li, Xinyi; He, Tingting; Wang, Rui; Zhao, Yang; Song, Hua; Wang, Huan
• Is Part Of: Journal of environmental chemical engineering. Volume 9:Issue 5(2021)
• Publication Date: 2021-10
• Subjects: Carbon nitride -- Hematite -- Z-scheme -- Photo Fenton degradation; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2021.105907
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: Graphite-phase carbon nitride (g-C3 N4 ) as a common low-cost photocatalyst can be used for the degradation of dye wastewater. However, it mainly suffers from the rapid recombination of charge carriers, which limits its photodegradation activity. In this work, a Z-scheme heterostructure system composed of three-dimensional flower-like Fe2 O3 and two-dimensional sheet-like g-C3 N4 was constructed by a simple solvothermal method. The introduction of Fe2 O3 not only enhances the absorption of visible light, but also strengthens its conductivity so as to improve the charge transport performance. Meanwhile, the heterojunction formation between Fe2 O3 and g-C3 N4 also promotes the efficient separation and transfer of photogenerated electrons and holes. By optimizing the experimental conditions of such as H2 O2 dosage, Fe2 O3 loaded amount and pH value, 8% Fe2 O3 /g-C3 N4 exhibited excellent photocatalytic degradation activity on amaranth that the degradation efficiency could reach 97.6% within 10 min, which is among the best results reported thus far. Based on the analysis of degradation products, a photodegradation pathway of amaranth azo dye was also proposed. Graphical Abstract: 3D/2D Fe2 O3 /g-C3 N4 Z-scheme heterojunction catalysts have been constructed for the photofenton degradation of amaranth under visible light irradiation. ga1 Highlights: Z-scheme heterojunction photocatalysts composed of 3D flower-like Fe2 O3 and 2D g-C3 N4 nanosheets were prepared. Fe2 O3 /g-C3 N4 composite exhibited superior catalytic activity in the photofenton degradation of amaranth. The roles of Fe2 O3 not only improve the conductivity of the composite, but also regulate the defects on g-C3 N4 . The separation and transfer performance of photogenerated charge carriers in Fe2 O3 /g-C3 N4 are improved. Singlet oxygen and superoxide radicals are the main active species.