Reinforced degradation of ibuprofen with MnCo2O4/FCNTs nanocatalyst as peroxymonosulfate activator: Performance and mechanism. Issue 3 (June 2022)

• Record Type: Journal Article
• Authors: He, Chao; Tang, Chunyan; Oh, Wen-Da
• Is Part Of: Journal of environmental chemical engineering. Volume 10:Issue 3(2022)
• Publication Date: 2022-06
• Subjects: Peroxymonosulfate -- MnCo2O4 -- Functionalized carbon nanotubes -- Sulfate radicals -- Catalytic mechanism; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2022.107874
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: In order to efficiently degrade ibuprofen (IBU) by peroxymonosulfate (PMS) activation, manganese cobalt oxide nanoparticles-decorated functionalized multi-walled carbon nanotubes (MnCo2 O4 /FCNTs) were prepared using a facile hydrothermal method. Comprehensive characterization of this PMS activator in multi-scale suggested that MnCo2 O4 nanoparticles were uniformly decorated on FCNTs. The catalytic performance was systematical evaluated under various environmental conditions, including temperature, pH, and the presence of different common water matrix species (e.g., Cl -, HCO3 -, and natural organic matter). The as-synthesized MnCo2 O4 /FCNTs demonstrated excellent catalytic activity with k app ranging 0.285–0.327 min −1 under a wide pH range of 3–9 within 10 min, which achieved a complete removal of IBU and a mineralization rate higher than 90%. During oxidation process for stability and reusability test, recycled MnCo2 O4 /FCNTs was found durable with negligible leaching of metal ions from spent catalyst, exhibiting its high stability for PMS activation with merely slight decrease of k app from 0.285 to 0.201 min −1 in the fourth cycle. Electron paramagnetic resonance analysis further confirmed that OH, SO4 - and 1 O2 were generated in the robust MnCo2 O4 /FCNTs-PMS system. Both radical and nonradical reactions were found to be responsible for the enhanced IBU degradation. Overall, this study sheds light on practical knowledge of IBU removal using MnCo2 O4 /FCNTs for PMS activation. Graphical Abstract: ga1 Highlights: MnCo2 O4 /FCNTs-PMS system exhibits excellent removal and mineralization of IBU. MnCo2 O4 /FCNTs presents good and stable reactivity within a wide pH range of 3–9. Recycled MnCo2 O4 /FCNTs is robust with negligible leaching of metal ions. Both radical and nonradical reactions are responsible for enhanced IBU degradation.