Degradation of 4-chlorophenol using MnOOH and γ-MnOOH nanomaterials as porous catalyst: Performance, synergistic mechanism, and effect of co-existing anions
Document Type
Journal Article
Publication Title
Environmental Research
Volume
215
PubMed ID
36116494
Publisher
Elsevier
School
School of Engineering
RAS ID
51910
Funders
Isfahan University of Medical Sciences (Project No.: 1400410 Ethic code: IR.MUI.RESEARCH.REC.1400.444& Project No.: 1400476; Ethic code: IR.MUI.RESEARCH.REC.1400.522)
Abstract
Transition metal catalysts have been proven to be a highly-potent catalyst for peroxymonosulfate (PMS) activation. The present work aimed to synthesizes the γ-MnOOH and MnOOH based on the one-pot hydrothermal method as PMS activators for efficient degradation of 4-chlorophenol (4 - CP). The effect of operational parameters including solution pH, γ-MnOOH and MnOOH dose, PMS dose, 4 - CP concentration, and also mixture media composition was elaborated. The results showed that the combination of MnOOH and γ-MnOOH with PMS noticeably creates a synergistic effect (SF) in 4 - CP degradation by both PMS/MnOOH and PMS/γ-MnOOH process, with a SF value of 48.14 and 97.42, respectively. In both systems, the removal of 4 -CP decreased in severely alkaline and acidic conditions, while no significant changes were observed in pH 5 to 9. Also, coexisting PO43ˉ significantly reduced the removal efficiency of both systems. In addition, the effect of humic acid (HA) as a classical scavenger was investigated and showed that presence of 4 mg/L HA reduced the removal efficiency of 4 - CP in the PMS/MnOOH process from 97.44 % to 79.3 %. The three consecutive use of both catalysts turned out that MnOOH has better stability than γ-MnOOH with lower Mn ions leaching. More importantly, quenching experiment showed that both non-radical (1O2 and [rad]O2 − ) and radical ([rad]SO4 − and [rad]OH) pathways are involved in 4-CP degradation and non-radical pathway was the dominant one in both systems.
DOI
10.1016/j.envres.2022.114316
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Ghanbari, S., Fatehizadeh, A., Taheri, E., Khiadani, M., & Iqbal, H. M. (2022). Degradation of 4-chlorophenol using MnOOH and γ-MnOOH nanomaterials as porous catalyst: Performance, synergistic mechanism, and effect of co-existing anions. Environmental Research, 215, Article 114316.
https://doi.org/10.1016/j.envres.2022.114316