Enhanced peroxymonosulfate activation for Orange I degradation by g-C3N4/AgFeO2 composite in water. Issue 2 (April 2022)

• Record Type: Journal Article
• Authors: Zhao, Ying; Wang, Shuo; Wei, Tong; Ren, Yueming; Luan, Tianzhu
• Is Part Of: Journal of environmental chemical engineering. Volume 10:Issue 2(2022)
• Publication Date: 2022-04
• Subjects: Delafossite -- G-C3N4 -- Peroxymonosulfate -- Heterogeneous catalysis; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2022.107241
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: The construction of heterogeneous catalysts with high efficiency is significant for the degradation of persistent contaminants. Herein, the g-C3 N4 /AgFeO2 composite was fabricated and its composition, morphology and structure were systematically characterized. g-C3 N4 /AgFeO2 exhibited boosting peroxymonosulfate (PMS) catalytic performance on the degradation of Orange I (OI) than pure AgFeO2 . It was optimized that the elimination of OI could be enhanced to 91%, with a kinetic rate of 0.076 min −1 . Such enhancement was attributed to the increment of low-valent metal species (Ag 0 /Ag +, Fe 2+ /Fe 3+ ) on AgFeO2 surface after coupling with g-C3 N4, additionally, the synergy of g-C3 N4 and AgFeO2 endowed the g-C3 N4 /AgFeO2 composite with higher conductivity and more electron transfer, thereby promoting effective PMS decomposition. The leaching of metal ions in the g-C3 N4 /AgFeO2 /PMS system was suppressed, which brought superior reusability and stability. It was verified that 1 O2 、O2 - 、SO4 - and OH acting as the key reactive oxygen species contributed to the OI removal. Our findings provided valuable insights into the design of efficient and stable g-C3 N4 -based organometallic composites for advanced oxidation processes. Graphical Abstract: ga1 Highlights: g-C3 N4 /AgFeO2 is fabricated for boosting catalytic ability toward PMS activation. The coupling of g-C3 N4 enhances the ratio of Ag 0 /Ag + and Fe 2+ /Fe 3+ on AgFeO2 . g-C3 N4 /AgFeO2 /PMS system shows lower metal ions leaching and good reusability. Radical and non-radical processes jointly contribute to Orange I degradation.