Effects of iron type in Fenton reaction on mineralization and biodegradability enhancement of hazardous organic compounds

Khan, Eakalak; Wirojanagud, Wanpen; Sermsai, Nawarat

doi:10.1016/j.jhazmat.2008.04.049

Cited by 56 publications

(22 citation statements)

References 34 publications

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“…The stock solution of pyrene was placed on a shaker for 1 minute before spiking. For simulation of an old soil contamination, a portion of spiked soil sample was aged for one year and then used in experiments [20]. The soil was analyzed for physical and chemical characteristics by Tarbiat Modares University Engineering Soils Testing Lab, Iran (Table 1).…”

Section: Methodsmentioning

confidence: 99%

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

Jorfi

Rezaee

Mohebali

et al. 2013

J Environ Health Sci Engineer

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BackgroundThe problems related to conventional Fenton oxidation, including low pH required and production of considerable amounts of sludge have led researchers to investigate chelating agents which might improve the operating range of pH and the use of nano iron particle to reduce the excess sludge. The pyrene removal from contaminated soils by modified Fenton oxidation at neutral pH was defined as the main objective of the current study.MethodsVarying concentrations of H2O2 (0-500 mM) and iron nano oxide (0-60 mM), reaction times of 0.5-24 hours and variety of chelating agents including sodium pyrophosphate, sodium citrate, ethylene diamine tetraacetic, fulvic and humic acid were all investigated at pyrene concentration levels of 100 – 500 mg/kg.ResultsBy applying the following conditions (H2O2 concentration of 300 mM, iron nano oxide of 30 mM, sodium pyrophosphate as chelating agent, pH 3 and reaction time of 6 hours) the pyrene removal efficiency at an initial concentration of 100 mg/kg was found to be 99%. As a result, the pyrene concentration was reduced from 100 to 93 mg/kg once the above optimum conditions are met.ConclusionsIn this research, the modified Fenton oxidation using iron nano oxide at optimum conditions is introduced as an efficient alternative method in lab scale for chemical remediation or pre-treatment of soils contaminated by pyrene at neutral pH.

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Section: Methodsmentioning

confidence: 99%

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

Jorfi

Rezaee

Mohebali

et al. 2013

J Environ Health Sci Engineer

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“…To surmount this limitation and enhance contaminant removal efficiency under natural conditions, researchers have developed novel modifications of the classic Fenton process. One of the common modifications involves the use of Fe(III), instead of Fe(II) to catalyze the reactions with the generation of reactive oxygen species [13]. In the Fe(III)/H 2 O 2 system, the spontaneous reaction between H 2 O 2 and Fe(III) primarily forms Fe(III)-hydroperoxy complexes (Eq.…”

Section: Introductionmentioning

confidence: 99%

Enhancement effects of chelating agents on the degradation of tetrachloroethene in Fe(III) catalyzed percarbonate system

Miao¹,

et al. 2015

Chemical Engineering Journal

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The performance of Fe(III)-based catalyzed sodium percarbonate (SPC) for stimulating the oxidation of tetrachloroethene (PCE) for groundwater remediation applications was investigated. The chelating agents citric acid monohydrate (CIT), oxalic acid (OA), and Glutamic acid (Glu) significantly enhanced the degradation of PCE. Conversely, ethylenediaminetetraacetic acid (EDTA) had a negative impact on PCE degradation, which may due to its strong Fe chelation and HO• scavenging abilities. However, excessive SPC or chelating agent will retard PCE degradation. In addition, investigations using free radical probe compounds and radical scavengers revealed that PCE was primarily degraded by HO• radical oxidation in both the chelated and non-chelated systems, while O2•− also participated in the non-chelated system and the OA and Glu modified systems. According to the electron paramagnetic resonance (EPR) studies, the presence of HO• in the Fe(III)/SPC system was maintained much longer than that in the Fe(II)/SPC system. The results indicated that the addition of CIT, OA or Glu indeed enhanced the generation of HO• in the first 10 min and promoted degradation efficiency by increasing the amount of Fe(III) and maintaining the concentration of HO• radicals in solution. In conclusion, chelated Fe(III)-based catalyzed SPC oxidation is a promising method for the remediation of PCE-contaminated groundwater.

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“…This is mainly due to their large specific surface area, high surface reactivity, and ability to penetrate into zones that are inaccessible to microsize solid catalysts. This may account for the observed improved mineralisation efficiency and biodegradability of Fe 0 over Fe 2+ reported by Khan and co-workers [21]. …”

Section: Introductionmentioning

confidence: 61%

Kinetic Modeling of a Heterogeneous Fenton Oxidative Treatment of Petroleum Refining Wastewater

Hasan

Raman

Daud

2014

The Scientific World Journal

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The mineralisation kinetics of petroleum refinery effluent (PRE) by Fenton oxidation were evaluated. Within the ambit of the experimental data generated, first-order kinetic model (FKM), generalised lumped kinetic model (GLKM), and generalized kinetic model (GKM) were tested. The obtained apparent kinetic rate constants for the initial oxidation step (k 2′), their final oxidation step (k 1′), and the direct conversion to endproducts step (k 3′) were 10.12, 3.78, and 0.24 min−1 for GKM; 0.98, 0.98, and nil min−1 for GLKM; and nil, nil, and >0.005 min−1 for FKM. The findings showed that GKM is superior in estimating the mineralization kinetics.

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Effects of iron type in Fenton reaction on mineralization and biodegradability enhancement of hazardous organic compounds

Cited by 56 publications

References 34 publications

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

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

Enhancement effects of chelating agents on the degradation of tetrachloroethene in Fe(III) catalyzed percarbonate system

Kinetic Modeling of a Heterogeneous Fenton Oxidative Treatment of Petroleum Refining Wastewater

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