Mineralization of pentachlorophenol by ferrioxalate-assisted solar photo-Fenton process at mild pH

Zhihong Ye, Ignasi Sirés, Hui Zhang, Yao-Hui Huang

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

This work reports the use of ferrioxalate complexes to assist solar photo-Fenton treatment of pentachlorophenol (PCP) in aqueous medium at mild pH, which inhibits the precipitation of iron hydroxides and allows working at a low iron dosage. The experimental parameters were optimized by assessing the effect of initial concentrations of H2O2 (0–2.5 mM) and Fe(II) (2–10 mg/L), pH (3.0–9.0) and iron/oxalic acid molar ratios (1:0–1:13.5) on total organic carbon (TOC) removal. Ferrioxalate-assisted solar photo-Fenton achieved 97.5% mineralization in 120 min, clearly outperforming conventional Fenton and solar photo-Fenton. The presence of photosensitive ferrioxalate complexes accounted for the enhancement, as a result of Fe(II) regeneration that accelerated the hydroxyl radical ([rad]OH) production. The time course of H2O2 and Fe(II) concentrations was evaluated under different iron/oxalic acid ratios. The five carboxylic acids determined by ion-exclusion HPLC and the eight aromatic by-products identified by GC-MS allowed the proposal of a degradation pathway that included hydroxylation, dechlorination and dimerization steps. Complete chloride ion release was achieved after 90 min of treatment.

Original languageEnglish
Pages (from-to)475-482
Number of pages8
JournalChemosphere
Volume217
DOIs
Publication statusPublished - 2019 Feb 1

Fingerprint

Pentachlorophenol
PCP
Iron
oxalic acid
mineralization
Oxalic Acid
iron
Oxalic acid
iron hydroxide
ion
Hydroxides
dechlorination
Ions
carboxylic acid
hydroxyl radical
Dechlorination
Hydroxylation
total organic carbon
Dimerization
regeneration

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Environmental Chemistry
  • Chemistry(all)
  • Pollution
  • Health, Toxicology and Mutagenesis

Cite this

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title = "Mineralization of pentachlorophenol by ferrioxalate-assisted solar photo-Fenton process at mild pH",
abstract = "This work reports the use of ferrioxalate complexes to assist solar photo-Fenton treatment of pentachlorophenol (PCP) in aqueous medium at mild pH, which inhibits the precipitation of iron hydroxides and allows working at a low iron dosage. The experimental parameters were optimized by assessing the effect of initial concentrations of H2O2 (0–2.5 mM) and Fe(II) (2–10 mg/L), pH (3.0–9.0) and iron/oxalic acid molar ratios (1:0–1:13.5) on total organic carbon (TOC) removal. Ferrioxalate-assisted solar photo-Fenton achieved 97.5{\%} mineralization in 120 min, clearly outperforming conventional Fenton and solar photo-Fenton. The presence of photosensitive ferrioxalate complexes accounted for the enhancement, as a result of Fe(II) regeneration that accelerated the hydroxyl radical ([rad]OH) production. The time course of H2O2 and Fe(II) concentrations was evaluated under different iron/oxalic acid ratios. The five carboxylic acids determined by ion-exclusion HPLC and the eight aromatic by-products identified by GC-MS allowed the proposal of a degradation pathway that included hydroxylation, dechlorination and dimerization steps. Complete chloride ion release was achieved after 90 min of treatment.",
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Mineralization of pentachlorophenol by ferrioxalate-assisted solar photo-Fenton process at mild pH. / Ye, Zhihong; Sirés, Ignasi; Zhang, Hui; Huang, Yao-Hui.

In: Chemosphere, Vol. 217, 01.02.2019, p. 475-482.

Research output: Contribution to journalArticle

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