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)

Comments

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

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 PO4 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

Access Rights

subscription content

Share

 
COinS