Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/147577
Title: Mineralization of pentachlorophenol by ferrioxalate-assisted solar photo-fenton process at mild pH
Author: Ye, Zhihong
Sirés Sadornil, Ignacio
Zhang, Hui
Huang, Yao-Hui
Keywords: Biomineralització
Fenols
Biomineralization
Phenols
Issue Date: 1-Nov-2018
Publisher: Elsevier Ltd
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 (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.
Note: Versió postprint del document publicat a: https://doi.org/10.1016/j.chemosphere.2018.10.221
It is part of: Chemosphere, 2018, vol. 217, p. 475-482
URI: http://hdl.handle.net/2445/147577
Related resource: https://doi.org/10.1016/j.chemosphere.2018.10.221
ISSN: 0045-6535
Appears in Collections:Articles publicats en revistes (Ciència dels Materials i Química Física)

Files in This Item:
File Description SizeFormat 
683041.pdf253.22 kBAdobe PDFView/Open    Request a copy


Embargat   Document embargat fins el 1-11-2020


This item is licensed under a Creative Commons License Creative Commons