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Modified Fenton oxidation of pyrene in contaminated soils using iron nano oxides

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Author(s): Sahand Jorfi | Abbas Rezaee | Nemat Allah Jaafarzadeh Haghighi Fard | Ghasem Ali Mohebali

Journal: Journal of School of Public Health and Institute of Public Health Research
ISSN 1735-7586

Volume: 10;
Issue: 4;
Start page: 91;
Date: 2013;
Original page

Keywords: Soil pollution | Pyrene | Fenton Oxidation | Iron nano oxides | Chelating agent

ABSTRACT
Background and Aim: Problems related to conventional Fenton oxidation, including neccesity of having a low pH and production of considerable amounts of sludge, have prompted researchers to consider chelating agents to improve the pH operating range and iron nano-oxide particles to reduce excess sludge. The main objective of this study was to remove pyrene from contaminated soils by a modified Fenton oxidation method  at neutral pH. Materials and Methods: Experiments were conducted using various concentrations of H2O2 (0-500 mM), iron nano-oxides (0-60 mM), reaction times (0.5-24 hours) and several chelating agents, namely, sodium pyrophosphate, ethylene diamine tetra-acetic acid, sodium citrate, fulvic and humic acids, to eliminate pyrene from soil (concentrations of 100-500 mg/kg). Results: The efficiency of removal of pyrene at an initial concentration of 100 mg/kg was 99 % at the following reaction conditions: H2O2 and iron nano-oxide concentrations of 300 mM and 30 mM, respectively; pH=3; and a reaction time of 6 hours. The initial pyrene concentration of 100 mg/kg decreased to 7 mg/kg at optimum conditions using sodium pyrophosphate as the chelating agent at pH 7.     Conclusion: The modified Fenton oxidation method, using iron nano-oxide at optimum conditions as defined in this research, is an efficient alternative for chemical remediation or pre-treatment of soils contaminated wih pyrene at neutral pH. 
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