Depth of Fenton-Like Oxidation in Remediation of Surface Soil

Kakarla, Prasad; Watts, Richard J.

doi:10.1061/(asce)0733-9372(1997)123:1(11)

Cited by 84 publications

(44 citation statements)

References 17 publications

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“…Similarly, in the homogeneous Fenton reaction, the stability of H 2 O 2 has also been found to be increased by phosphate, which was attributed to the inactivation of iron ions as catalyst, due to the complexation and precipitation of iron-phosphate species (Watts and Dilly, 1996;Pignatello et al, 2006). Accordingly, orthophosphate (H 2 PO 4 − ) was considered to be used as a H 2 O 2 stabilizer in Fenton and Fenton-like reaction-based remediation of contaminated soils (Kakarla and Watts, 1997;Vicente et al, 2011). However, as revealed in the present work, the removal of catechol was reduced initially and the DOC removal was clearly inhibited in the presence of phosphate.…”

Section: Effect Of Phosphate On Catechol Removal and H 2 O 2 Decomposmentioning

confidence: 56%

Effect of phosphate on heterogeneous Fenton oxidation of catechol by nano-Fe 3 O 4 : Inhibitor or stabilizer?

Yang

Sun

et al. 2016

Journal of Environmental Sciences

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The effect of phosphate on adsorption and oxidation of catechol, 1,2-dihydroxybenzene, in a heterogeneous Fenton system was investigated. In situ attenuated total reflectance infrared spectroscopy (ATR-FTIR) was used to monitor the surface speciation at the nano-Fe 3 O 4 catalyst surface. The presence of phosphate decreased the removal rate of catechol and the abatement of dissolved organic compounds, as well as the decomposition of H 2 O 2 . This effect of phosphate was mainly due to its strong reaction with surface sites on the iron oxide catalyst. At neutral and acid pH, phosphate could displace the adsorbed catechol from the surface of catalyst and also could compete for surface sites with H 2 O 2 . In situ IR spectra indicated the formation of iron phosphate precipitation at the catalyst surface. The iron phosphate surface species may affect the amount of iron atoms taking part in the catalytic decomposition of H 2 O 2 and formation of hydroxyl radicals, and inhibit the catalytic ability of Fe 3 O 4 catalyst. Therefore, phosphate ions worked as stabilizer and inhibitor in a heterogeneous Fenton reaction at the same time, in effect leading to an increase in oxidation efficiency in this study. However, before use of phosphate as pH buffer or H 2 O 2 stabilizer in a heterogeneous Fenton system, the possible inhibitory effect of phosphate on the actual removal of organic pollutants should be fully considered.

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Section: Effect Of Phosphate On Catechol Removal and H 2 O 2 Decomposmentioning

confidence: 56%

Effect of phosphate on heterogeneous Fenton oxidation of catechol by nano-Fe 3 O 4 : Inhibitor or stabilizer?

Yang

Sun

et al. 2016

Journal of Environmental Sciences

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“…많은 연구는 유기오염물질의 분해 를 목적으로 수행되었으며, 반응속도 및 메커니즘에 관한 논문이 다수 발표되었다 (Baciocchi et al, 2004, Kwan and Voelker, 2003, Yap et al, 2011, Watts et al, 2005. (Kakaria and Watts, 1997, Vicente et al, 2011, Watts et al, 2005, Watts et al, 2007 참 고 문 헌…”

Section: 서 론unclassified

Stabilization of Hydrogen Peroxide using Malonic Acid in Fenton and Fenton-like reactions

Kim¹,

Kim³

2013

Journal of Soil and Groundwater Environment

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Hydrogen peroxide takes much of the cost for Fenton reaction applied for treatment of organic contaminants. Therefore, the effective use of hydrogen peroxide makes the technology more cost effective. The effective use of hydrogen peroxide is especially needed in the soil and groundwater remediation where complete mixing is not possible and it takes a long time for reactive species to transport to the fixed target compounds. Stabilization ability for hydrogen peroxide of malonic acid was evaluated in Fenton and Fenton-like reactions in this study. Malonic acid contributes on the stabilization of hydrogen peroxide by weak interaction between iron and the stabilizer and inhibiting the catalytic role of iron. The stabilization effect increased as the solution pH decrease below the pK a1 . The stabilization effect increased as the concentration of malonic acid increased and the effect was maximized at the malonic acid concentration of about ten times higher than the iron concentration. The model organic contaminant was successfully oxidized in the presence of the stabilizer but the degradation rate was slower than the system without the stabilizer. The stabilization effect was also proved in a Fenton-like reaction where magnetite and hematite were used instead of soluble iron species.

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“…As described by Kakarla and Watts (1997), surface application of hydrogen peroxide can have significant influence only in the top few centimeters of a soil due to competing reactions in the soil that quickly consume residual hydrogen peroxide. Based on prevailing subsurface conditions, hydrogen peroxide may be decomposed to either free radicals or molecular oxygen (Schumb et al, 1955).This is catalyzed by natural organic enzymes (e.g., catalase, peroxidase, etc.)…”

Section: Physicochemical Processes In the Subsurfacementioning

confidence: 99%

Modified Fenton's processes for effective in‐situ chemical oxidation—Laboratory and field evaluation

Kakarla¹,

Andrews²,

Greenberg³

et al. 2002

Remediation Journal

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Depth of Fenton-Like Oxidation in Remediation of Surface Soil

Cited by 84 publications

References 17 publications

Effect of phosphate on heterogeneous Fenton oxidation of catechol by nano-Fe 3 O 4 : Inhibitor or stabilizer?

Effect of phosphate on heterogeneous Fenton oxidation of catechol by nano-Fe 3 O 4 : Inhibitor or stabilizer?

Stabilization of Hydrogen Peroxide using Malonic Acid in Fenton and Fenton-like reactions

Modified Fenton's processes for effective in‐situ chemical oxidation—Laboratory and field evaluation

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