Exploring the Role of Persulfate in the Activation Process

Radical Precursor Versus Electron Acceptor

Eun Tae Yun, Ha Young Yoo, Hyokwan Bae, Hyoungil Kim, Jaesang Lee

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

This study elucidates the mechanism behind persulfate activation by exploring the role of various oxyanions (e.g., peroxymonosulfate, periodate, and peracetate) in two activation systems utilizing iron nanoparticle (nFe0) as the reducing agent and single-wall carbon nanotubes (CNTs) as electron transfer mediators. Since the tested oxyanions serve as both electron acceptors and radical precursors in most cases, oxidative degradation of organics was achievable through one-electron reduction of oxyanions on nFe0 (leading to radical-induced oxidation) and electron transfer mediation from organics to oxyanions on CNTs (leading to oxidative decomposition involving no radical formation). A distinction between degradative reaction mechanisms of the nFe0/oxyanion and CNT/oxyanion systems was made in terms of the oxyanion consumption efficacy, radical scavenging effect, and EPR spectral analysis. Statistical study of substrate-specificity and product distribution implied that the reaction route induced on nFe0 varies depending on the oxyanion (i.e., oxyanion-derived radical), whereas the similar reaction pathway initiates organic oxidation in the CNT/oxyanion system irrespective of the oxyanion type. Chronoamperometric measurements further confirmed electron transfer from organics to oxyanions in the presence of CNTs, which was not observed when applying nFe0 instead.

Original languageEnglish
Pages (from-to)10090-10099
Number of pages10
JournalEnvironmental Science and Technology
Volume51
Issue number17
DOIs
Publication statusPublished - 2017 Sep 5

Fingerprint

Carbon Nanotubes
Chemical activation
electron
Electrons
oxidation
Oxidation
Reducing Agents
Scavenging
electron spin resonance
Spectrum analysis
spectral analysis
Paramagnetic resonance
Iron
carbon nanotube
decomposition
Nanoparticles
Decomposition
substrate
Degradation
degradation

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry

Cite this

Yun, Eun Tae ; Yoo, Ha Young ; Bae, Hyokwan ; Kim, Hyoungil ; Lee, Jaesang. / Exploring the Role of Persulfate in the Activation Process : Radical Precursor Versus Electron Acceptor. In: Environmental Science and Technology. 2017 ; Vol. 51, No. 17. pp. 10090-10099.
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Exploring the Role of Persulfate in the Activation Process : Radical Precursor Versus Electron Acceptor. / Yun, Eun Tae; Yoo, Ha Young; Bae, Hyokwan; Kim, Hyoungil; Lee, Jaesang.

In: Environmental Science and Technology, Vol. 51, No. 17, 05.09.2017, p. 10090-10099.

Research output: Contribution to journalArticle

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