TY - JOUR
T1 - Mineralization of pentachlorophenol by ferrioxalate-assisted solar photo-Fenton process at mild pH
AU - Ye, Zhihong
AU - Sirés, Ignasi
AU - Zhang, Hui
AU - Huang, Yao Hui
N1 - Funding Information:
This work was supported by Natural Science Foundation of Hubei Province, China (Grant 2012FFA089 ) and the National Science Council of the Republic of China (No. NSC 102-2622-E-006-004-CC2 ). The authors also thank financial support from project CTQ2016-78616-R ( AEI / FEDER , EU) and PhD scholarship awarded to Z.H. Ye (State Scholarship Fund, CSC, China).
PY - 2019/2
Y1 - 2019/2
N2 - 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.
AB - 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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U2 - 10.1016/j.chemosphere.2018.10.221
DO - 10.1016/j.chemosphere.2018.10.221
M3 - Article
C2 - 30439659
AN - SCOPUS:85057160880
VL - 217
SP - 475
EP - 482
JO - Chemosphere
JF - Chemosphere
SN - 0045-6535
ER -