Effective degradation of phenol via catalytic wet peroxide oxidation over N, S, and Fe-tridoped activated carbon. (March 2020)

• Record Type: Journal Article
• Authors: Yang, Guo; Mo, Sha; Xing, Bo; Dong, Jingwen; Song, Xiang; Liu, Xingyong; Yuan, Jigang
• Is Part Of: Environmental pollution. Volume 258(2020)
• Publication Date: 2020-03
• Subjects: Hydrogen peroxide -- Activated carbon -- Ammonium ferrous sulfate -- Phenol -- Heteroatom; Pollution -- Periodicals; Pollution -- Environmental aspects -- Periodicals; Environmental Pollution -- Periodicals; Pollution -- Périodiques; Pollution -- Aspect de l'environnement -- Périodiques; Pollution -- Effets physiologiques -- Périodiques; Pollution; Pollution -- Environmental aspects; Periodicals; Electronic journals; 363.73
• DOI: 10.1016/j.envpol.2019.113687
• Languages: English
• ISSNs: 0269-7491

Abstract

Abstract: The N, S, and Fe-tridoped carbon catalysts (NSFe-Cs), Fe/ACNS1 and Fe/ACNS2, were synthesized by wet impregnation with different concentration of ammonium ferrous sulfate solution. The prepared catalysts have a similar textural structure. The N species, S species, Fe II and Fe III were simultaneously introduced onto the surface of catalysts. Comparison with the only Fe doped catalyst, NSFe-Cs showed greater stability and higher phenol removal in catalytic wet peroxide oxidation at different reaction condition. The main intermediates including p -hydroxybenzoic acid, formic acid, and maleic acid were determined in the treated wastewater. The high catalytic activity for NSFe-C was related to the ability of H2 O2 decomposition. NSFe-Cs have more amount of Fe II partially due to the formation of FeS2, which promoted the decomposition of H2 O2 on Fe/ACNS1 and Fe/ACNS2 surface. The generation of ·OH and ·HO2 /·O2 − radicals in the bulk solution was crucial to phenol degradation, and the decomposition of H2 O2 complied with the pseudo-first-order kinetics. The highly linear relationship between decomposition kinetic constant for H2 O2 and the amount of surface groups suggested, including Fe II species, pyridinic N/Fe-bonded N, pyrrolic N as well as graphitic N were responsible to the high activity of NSFe-Cs. Graphical abstract: Image 10482 Highlights: N, S, and Fe-codoped catalysts were prepared by ammonium ferrous sulfate salt. N, S and Fe-codoped catalyst displayed high phenol removal. The introduction of S improved the amount of Fe II on the catalyst surface. Fe II, N-py/Fe-Nx, N-pyr and N-g species were responsible for the high activity. Abstract : The increase of Fe II resulted from doping of S, and presence of N species (pyridinic N/Fe-bonded N, pyrrolic N as well as graphitic N) improved catalytic activity.