Tribromophenol Degradation by a Catechol-Drtven Fenton Reaction

Abstract

Tribromophenol (TBP) is a halogenated phenol mainly used as an intermediate of flame retardants in the electronics manufacturing industry as well as a fungicide in the wood industry to prevent fungal wood stain and decay. As a result of this massive use, its bio-availability, toxicity, and environmental fate are of increasing concern worldwide. TBP degradation by a catechol (CAT)-driven Fenton reaction was studied. In order to achieve the best yield in TBP degradation, an experimental design was applied for multivariate optimization of the experimental degrading system variables. At optimized concentrations, the CAT-driven Fenton reaction yielded 75% TBP degradation in 2 h at room temperature. The multivariate optimization showed that the highest TBP degradation (1 mol base) was obtained at a ratio of CAT: A time course degradation of TBP comparing the CAT-driven Fenton reaction with the classical Fenton reaction is also presented. During the first hours of reaction (up to 8h), increased degradation efficiencies were observed in the CAT-driven Fenton reaction in comparison with the conventional Fenton reaction. Possible causes for the observed behavior are also discussed.

Behavior of dihydroxybenzenes and gallic acid on the Fenton-based decolorization of dyes

“…To enhance the formation of OH radicals via Fenton systems, Fe 3+ -reducing dihydroxybenzenes (DHBs) have been evaluated as mediators in reactions designed to degrade recalcitrant compounds and contaminated wastewaters [6][7][8][9][10][11][12]. Recently, diluted wood extracts containing DHBs have increased azure B decolorization through Fenton-like reactions [13].…”

“…Many studies in the literature have aimed the degradation of a single recalcitrant compound as target pollutant, the catechol (1,2-dihydroxybenzene) or 2,3-dihydroxybenzoic acid being the most evaluated DHBs as mediators [6,7,11,12]. In the present work, we investigated the decolorization of four dyes by classical Fenton reaction (Fe 2+ /H 2 O 2 ), Fenton-like reaction (Fe 3+ /H 2 O 2 ), and DHB-driven Fenton systems using five DHB mediators: catechol, 2,3-dihydroxybenzoic, 2,4-dihydroxybenzoic, 2,5-dihydroxybenzoic, and 3,4-dihydroxyphenylacetic acids; gallic acid (3,4,5-trihydroxybenzoic acid) is a trihydroxybenzene and was also evaluated as mediator.…”

Sensitive Kinetic Spectrophotometric Method for the Determination of Diphenhydramine in Real Samples

“…The optimization of the reaction variables using response surface methodology allows us to find the optimal values in a defined range with a minimum set of experiments. The procedure permits getting a polynomial describing the relevance and interactions between the variables obtaining a graphical 3-D representation or surface plot [45]. Table 1 shows the set of experiments performed defined by the CCC model.…”

Zn-edta degradation by catechol-driven fenton reaction

“…This type of dependence on CAT has previously been reported for degrading other pollutants. 17,18 CATdriven Fenton reaction has been found to be more efficient than Fenton reaction, based on OH• radical and activated species production.…”