Pyrene removal from contaminated soils by modified Fenton oxidation using iron nano particles

Background: the problems related to conventional fenton oxidation, including low ph required and production ofconsiderable amounts of sludge have led researchers to investigate chelating agents which might improve theoperating range of ph and the use of nano iron particle to reduce the excess sludge. the pyrene removal fromcontaminated soils by modified fenton oxidation at neutral ph was defined as the main objective of the currentstudy.methods: varying concentrations of h2o2 (0-500 mm) and iron nano oxide (0-60 mm), reaction times of 0.5-24 hoursand variety of chelating agents including sodium pyrophosphate, sodium citrate, ethylene diamine tetraacetic, fulvicand humic acid were all investigated at pyrene concentration levels of 100 – 500 mg/kg.results: by applying the following conditions (h2o2 concentration of 300 mm, iron nano oxide of 30 mm, sodiumpyrophosphate as chelating agent, ph 3 and reaction time of 6 hours) the pyrene removal efficiency at an initialconcentration of 100 mg/kg was found to be 99%. as a result, the pyrene concentration was reduced from 100 to93 mg/kg once the above optimum conditions are met.conclusions: in this research, the modified fenton oxidation using iron nano oxide at optimum conditions isintroduced as an efficient alternative method in lab scale for chemical remediation or pre-treatment of soilscontaminated by pyrene at neutral ph.