Chemistry of Modified Fenton’s Reagent (Catalyzed H2O2 Propagations–CHP) for In Situ Soil and Groundwater Remediation

Watts, Richard J.; Teel, Amy L.

doi:10.1061/(asce)0733-9372(2005)131:4(612)

Cited by 220 publications

(139 citation statements)

References 61 publications

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“…The chemistry of the Fenton's process is based upon the reaction of hydrogen peroxide (E 0 = 1.80 and 0.87 V at pH 0 and 14 respectively) with a proper catalyst, leading to the generation of a pool of radicals [1], capable of non-selectively oxidizing a wide range of biorefractory organic pollutants such as chlorinated aliphatics, halogenated phenols, PAHs and PCBs. The radical produced in the Fenton's initiation Reaction (I) is the hydroxyl radical, whose formation can be achieved by adding an homogeneous catalyst, such as a transition metal salt [3,4], by generating the metal catalyst electrochemically by means of sacrificial steel electrodes or by using the metals naturally occurring in the environment as heterogeneous catalyst [5][6][7][8][9][10][11][12] The hydroxyl radicals generated through Reaction (I) react with hydrogen peroxide and begin a series of propagation reactions [2] …”

Section: Introductionmentioning

confidence: 99%

“…Namely, hydroxyl radical (OH • ) and perhydroxyl radical (HO 2 • ) are both oxidant, although the latter is a relatively weak one; superoxide radical (O 2 •− ) is a weak reductant and nucleophile in aqueous systems [2]. The oxidative properties of a Fenton's system is therefore the result of the combined activities of the different radical generated and is not strictly correlated to just one radical species.…”

Section: Introductionmentioning

confidence: 99%

“…The oxidative properties of a Fenton's system is therefore the result of the combined activities of the different radical generated and is not strictly correlated to just one radical species. This consideration becomes more and more valid as the hydrogen peroxide concentration is increased, when Reaction (III) is more important [2].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of the operating conditions on highly oxidative radicals generation in Fenton's systems

Ciotti

Baciocchi

Tuhkanen

2009

Journal of Hazardous Materials

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a b s t r a c tIn this work, an indirect method for estimating the total amount and concentration of oxidative radicals in aqueous and slurry-phase Fenton's systems was developed. This method, based on the use of benzoic acid as probe compound, was applied for evaluating the effect of the operating conditions on the radicals amount produced, their production efficiency (i.e. moles of radicals generated per mole H 2 O 2 ) and their concentration. A Rotatable Central Composite design (RCC) was used to select the operating conditions in order to get a statistically meaningful data set. Hydrogen peroxide and ferrous ion concentrations ranged between 0.2-1 mM and 0.2-0.5 mM, respectively; humic acid concentration between 0 and 15 mg/L, whereas the soil/water weight ratio in slurry-phase systems between 1:10 and 9:10. The probe compound concentration was 9 or 0.1 mM in experiments aimed to evaluate the total amount or concentration of oxidative radicals, respectively. The obtained results indicated that the amount of radicals generated in both aqueous and soil slurry Fenton's system increased with higher H 2 O 2 concentration and, more specifically, that their production efficiency increased with increasing Fe(II):H 2 O 2 molar ratio. Addition of dissolved organic compounds as humic acid did not notably affect the oxidative radicals amount and concentration. On the contrary, a one order of magnitude reduction in both radicals amount generated and concentration was observed when soil was added to the reaction environment.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of the operating conditions on highly oxidative radicals generation in Fenton's systems

Ciotti

Baciocchi

Tuhkanen

2009

Journal of Hazardous Materials

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“…This aggressive treatment removes source zone contaminants either sorbed to soil organic matter or pure product present as nonaqueous phase liquids (Seol et al 2003;Watts and Teel 2005). Typical treatments include Fenton's reagent with hydrogen peroxide and ferrous iron, the less acidic modified Fenton's reagent, permanganate, persulfate, and ozone injection (Table 1).…”

Section: Introductionmentioning

confidence: 99%

Efforts to improve coupled in situ chemical oxidation with bioremediation: a review of optimization strategies

et al. 2010

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Purpose In order to provide highly effective yet relatively inexpensive strategies for the remediation of recalcitrant organic contaminants, research has focused on in situ treatment technologies. Recent investigation has shown that coupling two common treatments-in situ chemical oxidation (ISCO) and in situ bioremediation-is not only feasible but in many cases provides more efficient and extensive cleanup of contaminated subsurfaces. However, the combination of aggressive chemical oxidants with delicate microbial activity requires a thorough understanding of the impact of each step on soil geochemistry, biota, and contaminant dynamics. In an attempt to optimize coupled chemical and biological remediation, investigations have focused on elucidating parameters that are necessary to successful treatment. In the case of ISCO, the impacts of chemical oxidant type and quantity on bacterial populations and contaminant biodegradability have been considered. Similarly, biostimulation, that is, the adjustment of redox conditions and amendment with electron donors, acceptors, and nutrients, and bioaugmentation have been used to expedite the regeneration of biodegradation following oxidation. The purpose of this review is to integrate recent results on coupled ISCO and bioremediation with the goal of identifying parameters necessary to an optimized biphasic treatment and areas that require additional focus. Conclusions and recommendations Although a biphasic treatment consisting of ISCO and bioremediation is a feasible in situ remediation technology, a thorough understanding of the impact of chemical oxidation on subsequent microbial activity is required. Such an understanding is essential as coupled chemical and biological remediation technologies are further optimized.

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“…In parliamentary law to study the catalytic action of different catalysts, decomposition of hydrogen peroxide is applied by different scientists and researcher that for well like indicator reaction [6] as the conversion of hydrogen peroxide to water and oxygen are strongly moved by the catalyst. And also the catalytic decomposition of H 2 O 2 is extensively studied due to its various applications [7][8][9]. At room temperature the decomposition of hydrogen peroxide is very slow but in the mien of a catalyst decomposition will be triggered.…”

Section: Introductionmentioning

confidence: 99%

Nano-copper Oxide as Catalyst for Click Reactions

ElKhashab¹,

Nayl²,

Badawy³

et al. 2016

JCCE

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Click reactions are not specific reactions, but they are a way of generating products that follow examples in nature by joining small moieties, with each other producing a huge molecule in a good yield. The mind of that reaction is used in biomolecules synthesis, pharmacological and various biometric applications. The first Click reaction is the Copper compounds-catalyzed reaction of an azide with an alkyne (CuAAC), this copper-catalyzed "click" does not require legands on the metal but the metal oxides also can accelerate the reactions. For enhancement the products of Click reactions we were replacing the copper compounds in a classical reaction by the prepared nanocopper compound (NPs). And measure the consumption of starting material. Behind the evolution is the catalytic effect of nanocopper compounding (NPs) on (H 2 O 2 ). Owing to the huge surface area of nanocopper compound (NPs), it was found that: the (NPs) can speed up decomposition of H 2 O 2 , also can accelerate the classical click reaction.

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Chemistry of Modified Fenton’s Reagent (Catalyzed H2O2 Propagations–CHP) for In Situ Soil and Groundwater Remediation

Cited by 220 publications

References 61 publications

Influence of the operating conditions on highly oxidative radicals generation in Fenton's systems

Influence of the operating conditions on highly oxidative radicals generation in Fenton's systems

Efforts to improve coupled in situ chemical oxidation with bioremediation: a review of optimization strategies

Nano-copper Oxide as Catalyst for Click Reactions

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