TY - JOUR
T1 - Remediation of PAH-contaminated soils by magnetite catalyzed Fenton-like oxidation
AU - Usman, M.
AU - Faure, P.
AU - Ruby, C.
AU - Hanna, K.
N1 - Funding Information:
The authors gratefully acknowledge the financial support of this work by Higher Education Commission of Pakistan (HEC) and ADEME “Agence de l’Environnement et de la Maîtrise de l’Energie” (Grant N° 0972C0016 ). We are also thankful to the Région Lorraine and GISFI (Groupement d’Intérêt Scientifique sur les Friches Industrielles) for support. Finally, we would like to thank the reviewers who helped to improve the quality of the manuscript.
PY - 2012/5/18
Y1 - 2012/5/18
N2 - This is the premier study reporting the degradation of polycyclic aromatic hydrocarbons (PAHs) through Fenton-like oxidation catalyzed by magnetite. Kinetic degradation of PAHs was studied at circumneutral pH by treatments: (i) H 2O 2+soluble Fe II (F), (ii) H 2O 2+magnetite as iron source (FL) and (iii) H 2O 2 alone without catalyst (HP). Results show that oxidation of a model PAH compound (fluorenone) spiked on sand resulted in its complete removal by FL treatment but degradation did not exceed 20% in HP or F systems. However, in two PAHs polluted soils (sampled from coking plant sites), negligible oxidation of 16 PAHs was observed regardless of the catalyst used: soluble Fe II or magnetite. Then organic extract separated from these soils was added to sand and after evaporation of the solvent, oxidation was performed which resulted in more than 90% of PAHs removal by FL as compared to 15% by F or HP systems. These removal extents decreased by a factor of two when the organic extracts were oxidized in the presence of original soil. PAHs degradation extent was improved in soils pre-treated with availability-enhancement agents such as ethanol or cyclodextrin. Degradation was non-selective and no by-products were observed by GC-MS and μFTIR. Treatment efficiency was highly limited by PAHs availability in soils and the soil matrix effect. This study points out the promising efficiency of magnetite for PAHs oxidation at circumneutral pH over soluble Fe II in contaminated soils, and has important implications in the remediation of contaminated soils.
AB - This is the premier study reporting the degradation of polycyclic aromatic hydrocarbons (PAHs) through Fenton-like oxidation catalyzed by magnetite. Kinetic degradation of PAHs was studied at circumneutral pH by treatments: (i) H 2O 2+soluble Fe II (F), (ii) H 2O 2+magnetite as iron source (FL) and (iii) H 2O 2 alone without catalyst (HP). Results show that oxidation of a model PAH compound (fluorenone) spiked on sand resulted in its complete removal by FL treatment but degradation did not exceed 20% in HP or F systems. However, in two PAHs polluted soils (sampled from coking plant sites), negligible oxidation of 16 PAHs was observed regardless of the catalyst used: soluble Fe II or magnetite. Then organic extract separated from these soils was added to sand and after evaporation of the solvent, oxidation was performed which resulted in more than 90% of PAHs removal by FL as compared to 15% by F or HP systems. These removal extents decreased by a factor of two when the organic extracts were oxidized in the presence of original soil. PAHs degradation extent was improved in soils pre-treated with availability-enhancement agents such as ethanol or cyclodextrin. Degradation was non-selective and no by-products were observed by GC-MS and μFTIR. Treatment efficiency was highly limited by PAHs availability in soils and the soil matrix effect. This study points out the promising efficiency of magnetite for PAHs oxidation at circumneutral pH over soluble Fe II in contaminated soils, and has important implications in the remediation of contaminated soils.
KW - Fenton
KW - Magnetite
KW - Oxidation
KW - Polycyclic aromatic hydrocarbons
KW - Soil
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U2 - 10.1016/j.apcatb.2012.01.007
DO - 10.1016/j.apcatb.2012.01.007
M3 - Article
AN - SCOPUS:84858971378
SN - 0926-3373
VL - 117-118
SP - 10
EP - 17
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
ER -