Oxidation of bisphenol A by nonradical activation of peroxymonosulfate in the presence of amorphous manganese dioxide | Health & Environmental Research Online (HERO)

HERO ID

5074350

Reference Type

Journal Article

Title

Oxidation of bisphenol A by nonradical activation of peroxymonosulfate in the presence of amorphous manganese dioxide

Author(s)

Wang, L; Jiang, Jin; Pang, S; Zhou, Y; Li, J; Sun, S; Gao, Y; Jiang, C

Year

2018

Is Peer Reviewed?

Yes

Journal

Chemical Engineering Journal
ISSN: 1385-8947

Volume

352

Page Numbers

1004-1013

Language

English

DOI

10.1016/j.cej.2018.07.103

Web of Science Id

WOS:000444001900104

URL

https://www.scopus.com/inward/record.uri?eid=2-s2.0-85050147752&doi=10.1016%2fj.cej.2018.07.103&partnerID=40&md5=90ee690b66dccf8aaae562d2bd095f0a
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Abstract

This work demonstrated that bisphenol A (BPA) was rapidly degraded by peroxymonosulfate (PMS) in the presence of amorphous manganese dioxide (MnO2). Chemical quenching experiments and electron paramagnetic resonance spectroscopy (EPR) suggested that hydroxyl radical ((OH)-O-center dot), sulfate radical (SO4 center dot-), and singlet oxygen (O-1(2)) were unlikely responsible for BPA oxidation. As such, a nonradical mechanism involving the formation of reactive complexes between amorphous MnO2 and PMS was tentatively proposed based on the PMS decomposition and Raman spectra. The presence of phosphate ions (H2PO4 center dot-) remarkably suppressed the degradation of BPA, while the addition of divalent metal ions (Ca2+, Mg2+, and Zn2+) appreciably enhanced BPA degradation. The discrepancy was likely resulted from their contrasting influences on the formation of reactive PMS-MnO2 complexes. Based on identified oxidation products (i.e., dimers, 4-hydroxycumyl alcohol, monohydroxylated BPA and its quinone derivative) by liquid chromatography tandem mass spectrometry, the transformation pathways of BPA in amorphous MnO2/PMS system involving one-electron oxidation, radical coupling, bond cleavage, and hydroxylation were proposed. In addition to BPA, thirteen other selected phenolic compounds were also efficiently degraded by amorphous MnO2/PMS system, and good correlations between apparent pseudo-first-order reaction rate constants (k(obs)) and descriptor variables (i.e., Hammett constants sigma(+) and half-wave potentials E-1/2) were obtained.

Keywords

Peroxymonosulfate; Amorphous MnO2; Bisphenol A; Nonradical mechanism; Transformation pathways