Degradation mechanism of diethyl phthalate with electrogenerated hydroxyl radical on a Pd/C gas-diffusion electrode

Wang, Hui; Sun, Dezhi; Bian, Zhaoyong

doi:10.1016/j.jhazmat.2010.04.095

Cited by 46 publications

(31 citation statements)

References 41 publications

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“…To our best knowledge, ethyl-3-hydroxybenzoate was first identified in Fenton process. This finding suggested that the DEP degradation in Fenton process mainly occurred initially via the hydroxylation of the aromatic ring rather than the aromatic ring decomposition firstly, with the aromatic ring remaining intact; this finding was consistent with previous studies (28,40). The chemical oxidation degradation pathway of DEP with •OH was presented based on the current study and previous literature ( Figure 5) (28, 38).…”

Section: Discussion Of Intermediate Formationsupporting

confidence: 92%

“…This finding indicated that DEP mineralization (i.e., conversion of organic carbon to CO 2 ) hardly occur in Fenton system even when DEP was almost completely removed; such process is similar to sonolysis, photolysis, and sonophotolysis processes (7). The combined processes for DEP degradation generally occurred faster than for individual processes (28).…”

Section: Effect Of Operating Parametersmentioning

confidence: 91%

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Fenton’s Oxidation Kinetics, Pathway, and Toxicity Evaluation of Diethyl Phthalate in Aqueous Solution

Zhang

Wang

Lei

2016

Journal of Advanced Oxidation Technologies

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Abstract:A comprehensive study of the chemical oxidation degradation of diethyl phthalate (DEP) was conducted through Fenton processes. Effects of various operating parameters that considerably affect DEP decomposition were investigated, including solution pH, H 2 O 2 , Fe 2+ , and DEP concentration. The removal efficiency of DEP achieved 98% under reaction conditions of pH value of 3.0, concentration of 0.3 mM of Fe 2+ , and 6.0 mM of H 2 O 2 after 170 min. In general, DEP degradation in Fenton process was found to occur in two stages, with an extremely fast stage and then a slow one, as a result of change of H 2 O 2 and Fe 2+ initial concentration. Based on the pseudo-steady-state hypothesis of hydroxyl radical formed by the Fenton reaction, a kinetic model for DEP degradation has been proposed which describes the effect of decomposition byproducts on the oxidation reaction. The experiment results also were in good agreement with Behnajady-Modirshahla-Ghanbery (BMG) kinetic model. During the degradation process, seven degradation intermediates of DEP were detected out by means of GC/MS, including ethyl 2-hydroxybenzoate, ethyl 3-hydroxybenzoate, phthalic anhydride, benzoic acid ethyl ester, malonic acid, oxalic acid, and acetic acid. Probable degradation pathway of DEP by the Fenton reaction was also proposed. Inhibitory effects of DEP and intermediate products were investigated in aqueous solution with Photobacterium phosphoreum. Findings indicated that the solution was not completely detoxified even if DEP completely disappeared, further post-treatment was recommended. All these observations have significant potential applications and require further investigation.

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Section: Discussion Of Intermediate Formationsupporting

confidence: 92%

Section: Effect Of Operating Parametersmentioning

confidence: 91%

Fenton’s Oxidation Kinetics, Pathway, and Toxicity Evaluation of Diethyl Phthalate in Aqueous Solution

Zhang

Wang

Lei

2016

Journal of Advanced Oxidation Technologies

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“…It is noted that, without any Fe 2+ catalyst, the GDE also shown an excellent performance in the degradation of phenol, suggesting the production of steady-state concentration of •OH radicals. This is in agreement with that obtained by Wang et al [9], who has been proved that, without any metal catalyst, OH• could be produced on a C/PTFE gas-diffusion electrode for the electrochemical oxidation of chlorophenols, and argued that the more H 2 O 2 yield, the more OH• produced. Compared with H 2 O 2 concentration of 8 mg/L produced in C/PTFE gas diffusion cathode [9], more than 250 mM H 2 O 2 was accumulated in present work, leading to a shorter time for phenol removal as a result of more OH• produced.…”

Section: Performance Of the Gde In An Electro-fenton Processsupporting

confidence: 93%

“…The effective conduction of proton/electron and access of reactant gas depend on the cathode structure [8]. Traditionally, the design of the gas diffusion layer is vital to the gas transfer and waterproof management, while the catalyst layer is crucial to oxygen reduction reaction (ORR) kinetics and three-phase interfaces [9]. Especially, a well-designed catalyst layer improves the uniform gas diffusion and favors the reaction process [10].…”

Section: Introductionmentioning

confidence: 99%

Electrical activation of hydrogen peroxide for organic contaminant degradation using an improved gas diffusion cathode

Luo¹,

Li²,

Sun³

et al. 2017

Proceedings of the 2017 6th International Conference on Energy and Environmental Protection (ICEEP 2017)

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Electrochemical degradation technology, being an environment-friendly way for the elimination of a broad-range of organic contaminants from water, is limited by low efficiency and high cost. In this study, an improved gas diffusion electrode (GDE) was constructed by rolling carbon black and polytetrafluoroethylene as conductive catalyst layer to improve the hydrogen peroxide production. The maximum concentration of 259.6 mM was obtained after 60 min, which is roughly eight times higher than the value obtained using the traditional reference cathode. Experiments indicated that the degradation of phenol in the electrochemical process was dominated by radical based mechanisms, which was obtained by the electro-generation and the subsequent electro-activation of hydrogen peroxide at the cathode interface.

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“…Thus, there are two degradation pathways that may occur in the EF system. One is the anodic electrochemical oxidation process on the Pt anode [13] and the other is the cathodic ·OH oxidation process in which the CuO-graphene cathode catalyzes the two-electron reduction of O 2 to H 2 O 2 under certain potential, and the H 2 O 2 may be converted to ·OH [14]. The specific capacitance is the ratio of capacity and mass of the electrode, which could represent the reversibility and stability of the as-prepared electrode while charging/discharging.…”

Section: Preparation and Characterization Of Cuo-graphene Cathodementioning

confidence: 99%

Degradation of Toxic Organic Contaminants by Graphene Cathode in an Electro‐Fenton System

Shuan¹,

Zhao²,

Jiang³

et al. 2017

Graphene Materials - Advanced Applications

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A novel composite electrode was constructed by pressing graphene and CuO, using a cathode in an electro-Fenton (EF) system. Cyclic voltammetry, charge/discharge curve and electrochemical impedance spectroscopy (EIS) were used to characterize the composite electrode. The degradation of a toxic organic contaminant, Terramycin, by EF system was studied in an undivided electrolysis cell. The possible degradation products of Terramycin were studied by a Fourier transform-infrared spectrum, and the findings showed that the structure of Terramycin was damaged. The variations of hydrogen peroxide and the relative content of hydroxyl radical (.OH) during the degradation process were traced by enzyme catalysis method and fluorescence spectrometry. The results showed that the electro-catalytic degradation of Terramycin occurred by an ·OH radical mechanism. More importantly, this as-prepared cathode was very stable and could be reused without any catalytic activity decrease, suggesting its potential application in the wastewater treatment.

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Degradation mechanism of diethyl phthalate with electrogenerated hydroxyl radical on a Pd/C gas-diffusion electrode

Cited by 46 publications

References 41 publications

Fenton’s Oxidation Kinetics, Pathway, and Toxicity Evaluation of Diethyl Phthalate in Aqueous Solution

Fenton’s Oxidation Kinetics, Pathway, and Toxicity Evaluation of Diethyl Phthalate in Aqueous Solution

Electrical activation of hydrogen peroxide for organic contaminant degradation using an improved gas diffusion cathode

Degradation of Toxic Organic Contaminants by Graphene Cathode in an Electro‐Fenton System

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