Pentachlorophenol dechlorination with zero valent iron: a Raman and GCMS study of the complex role of surficial iron oxides.

Show simple item record Gunawardana, Wijesinghage en Swedlund, Peter en Singhal, Naresh en Nieuwoudt, Michel en 2018-12-03T20:47:49Z en 2018-06 en
dc.identifier.issn 0944-1344 en
dc.identifier.uri en
dc.description.abstract The dechlorination of chlorinated organic pollutants by zero valent iron (ZVI) is an important water treatment process with a complex dependence on many variables. This complexity means that there are reported inconsistencies in terms of dechlorination with ZVI and the effect of ZVI acid treatment, which are significant and are as yet unexplained. This study aims to decipher some of this complexity by combining Raman spectroscopy with gas chromatography-mass spectrometry (GC-MS) to investigate the influence of the mineralogy of the iron oxide phases on the surface of ZVI on the reductive dechlorination of pentachlorophenol (PCP). Two electrolytic iron samples (ZVI-T and ZVI-H) were found to have quite different PCP dechlorination reactivity in batch reactors under anoxic conditions. Raman analysis of the "as-received" ZVI-T indicated the iron was mainly covered with the ferrous oxide (FeO) wustite, which is non-conducting and led to a low rate of PCP dechlorination. In contrast, the dominant oxide on the "as-received" ZVI-H was magnetite which is conducting and, compared to ZVI-T, the ZVI-H rate of PCP dechlorination was four times faster. Treating the ZVI-H sample with 1 N H2SO4 made small change to the composition of the oxide layers and also minute change to the rate of PCP dechlorination. However, treating the ZVI-T sample with H2SO4 led to the loss of wustite so that magnetite became the dominant oxide and the rate of PCP dechlorination increased to that of the ZVI-H material. In conclusion, this study clearly shows that iron oxide mineralogy can be a contributing factor to apparent inconsistencies in the literature related to ZVI performance towards dechlorination and the effect of acid treatment on ZVI reactivity. en
dc.format.medium Print-Electronic en
dc.language eng en
dc.relation.ispartofseries Environmental science and pollution research international en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. en
dc.rights.uri en
dc.subject Ferric Compounds en
dc.subject Ferrous Compounds en
dc.subject Pentachlorophenol en
dc.subject Water Purification en
dc.subject Ferrosoferric Oxide en
dc.subject Gas Chromatography-Mass Spectrometry en
dc.subject Halogenation en
dc.title Pentachlorophenol dechlorination with zero valent iron: a Raman and GCMS study of the complex role of surficial iron oxides. en
dc.type Journal Article en
dc.identifier.doi 10.1007/s11356-018-2003-5 en
pubs.issue 18 en
pubs.begin-page 17797 en
pubs.volume 25 en
dc.rights.holder Copyright: The author en
dc.identifier.pmid 29675820 en
pubs.end-page 17806 en
pubs.publication-status Published en
dc.rights.accessrights en
pubs.subtype Journal Article en
pubs.elements-id 738487 en Engineering en Civil and Environmental Eng en Science en Chemistry en
dc.identifier.eissn 1614-7499 en
pubs.record-created-at-source-date 2018-04-21 en
pubs.dimensions-id 29675820 en

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