Cobalt doped iron oxychloride as efficient heterogeneous Fenton catalyst for degradation of paracetamol and phenacetin. (January 2021)

• Record Type: Journal Article
• Authors: Tan, Chaoqun; Sheng, Tianyu; Xu, Qinglong; Xu, Tianhui; Sun, Kechun; Deng, Lin; Xu, Wei
• Is Part Of: Chemosphere. Volume 263(2021)
• Publication Date: 2021-01
• Subjects: Hydrogen peroxide -- Paracetamol -- Phenacetin -- Reactive oxygen species; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2020.127989
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Cobalt doped iron oxychloride (Co-FeOCl) was synthesized and employed as catalyst in Fenton degradation of paracetamol (APAP) and phenacetin (PNCT) for the first time. The catalytic performance was evaluated by means of various parameters including catalyst load, hydrogen peroxide (H2 O2 ) dose and pH value. The high removal of APAP (87.5%) and PNCT (76.0%) was obtained under conditions of 0.2 g/L Co-FeOCl and 0.5 mM H2 O2 at pH 7.0, with calculated pseudo-first order kinetic constants of 0.031 min −1 for APAP and 0.023 min −1 for PNCT. Particularly, quenching tests and in situ electron spin resonance (ESR) tests were employed for the identification of the reactive oxygen species (ROS) in system. Hydroxyl radical (· OH) and superoxide radical (O2 − · ) were the primary ROS in Co-FeOCl/H2 O2 system. A possible mechanism for H2 O2 activation by Co-FeOCl catalyst was proposed as well. Finally, the formation of typical disinfection by-products (DBPs) decreased slightly in Co-FeOCl/H2 O2 pre-oxidation. However, stability and reusability of Co-FeOCl were deactivated in the consecutive three cycles. Graphical abstract: Image 1 Highlights: The Co-FeOCl nanosheet is efficient as heterogeneous Fenton catalyst. · OH and O2 − · are responsible for pollutant removal in Co-FeOCl/H2 O2 system. Calculated toxicity of DBPs after Co-FeOCl/H2 O2 pre-oxidation decreased.