Oxygen vacancy concentration modulation of perovskite-based heterogeneous catalysts for Fenton-like oxidation of tetracycline. (15th August 2022)

• Record Type: Journal Article
• Authors: Li, Jinxin; Ma, Wencheng; Zhong, Dan; Li, Kefei; Ma, Jun; Zhang, Shaobo; Du, Xuan
• Is Part Of: Journal of cleaner production. Volume 362(2022)
• Publication Date: 2022-08-15
• Subjects: Fenton -- Perovskite -- A-site deficient -- Oxygen vacancy -- Tetracycline; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2022.132469
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: Oxygen vacancies (VO ) constructing in metallic compounds have been verified to enhance hydrogen peroxide (H2 O2 ) activation for pollutants treatment. However, the interactions between surface VO concentration and H2 O2 were still ambiguous. In this study, perovskites with different surface VO concentration were successfully prepared by a simple sol-gel process. Experimental results showed that A-site cation deficient was capable of distorting FeO6 octahedra in Ca1−x FeO3-δ (x = 0, 0.1, 0.2) orthorhombic perovskites for the regulation of surface VO concentration. Afterwards, Ca0.9 FeO3-δ exhibited excellent catalytic activity and stability for tetracycline (TC) degradation, which was 4 times higher of catalytic enhancement than that of the raw Ca1.0 FeO3-δ . Moreover, up to 9, 17 and 27 times of catalytic enhancement as compared with commercial Fe3 O4, ɑ-FeOOH and Fe2 O3 towards TC degradation. Based on electron spin resonance and free radical quenching experiments, the hydroxyl radical (∙OH) was the main active species for the catalytic degradation of TC. Meanwhile, higher or lower surface VO concentration was harmful to the production of ∙OH. Additionally, the toxicity of TC degradation by-products exhibited a decreasing trend according to the results of toxicological simulation. This work provides a new strategy for designing an efficient and promising heterogeneous Fenton-likes catalyst for environmental remediation. Graphical abstract: Image 1 Highlights: Perovskite with abundant surface VO was synthesized by sol-gel method. Surface VO concentration was regulated by regulated the A-site cation deficient. Higher or lower surface VO concentration was hamful to the activation of H2 O2 . Degradation intermediates were identified, and possible pathways were proposed.