Photochemical degradation of diethyl phthalate with UV/H2O2

Xu, Bin; Gao, Naiyun; Sun, Xiaofeng; Xia, Sheng-Yuan; Min, Rui; Simonnot, Marie-Odile; Causserand, Christel; Zhao, Jianfu

doi:10.1016/j.jhazmat.2006.06.026

Cited by 151 publications

(81 citation statements)

References 22 publications

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“…The peaks detected at the retention time of 4.496, 3.474, and 4.187 min were attributed to methyl esterified derivatives. The ethyl 2-hydroxybenzoate (P2) and benzoic acid ethyl ester (P6) were also detected by Xu et al (38) in the degradation of DEP by UV/H 2 O 2 . The detection of phthalic anhydride (P5) as a typical intermediate during the Fenton degradation was also detected as photolysis transformation products of DEP (39).…”

Section: Discussion Of Intermediate Formationmentioning

confidence: 79%

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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 Formationmentioning

confidence: 79%

“…The intermediates had more hydrophilic structure than DEP because this substance was eluted out from the column prior to DEP (Figure not shown) (38). The identification of intermediate products was performed by searching the NIST library with Agilent Mass Hunter Workstation software.…”

Section: Discussion Of Intermediate Formationmentioning

confidence: 99%

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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“…However, AOP technologies such as Photo, Photo Fenton, O 3 , and Photo/O 3 process have shown special capabilities to degrade toxic and persistent organics due to the generation of ·OH. For some examples, Xu et al (2007) investigated the effect of various factors such as H 2 O 2 dose, UV intensity, and water temperature on the oxidative kinetics of DEP in the UV/H 2 O 2 process. Oh et al (2006) monitored the difference of degradation efficiency with application of O 3 , UV and UV/O 3 process.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Ultrasonic Oxidation of Diethyl Phthalate Using Box-Behnken Design with Response Surface Methodology

Cui¹,

Jang²,

Kang³

et al. 2013

Journal of Korean Society of Hazard Mitigation

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The kinetic constant of diethyl phthalate (DEP) oxidized by ultrasound was measured as a function of ultrasound power density, Cl -concentration and solution temperature. The ultrasonic oxidation kinetic of DEP could be described by the pseudo-first-order) was identified using Box-Behnken Design coupled with Response Surface Methodology. The final equation for describing the kinetic constant k is as follows: Analysis of variance (ANOVA) tests showed that the second-order polynomial regression model could properly interpret the experimental data with a high determination coefficient (R 2 , 0.998). The P-value of the model was 0.0001 which is less than 0.05, implying that the model is significant.Besides, the response surface showed that ultrasound power density gave much more effect than another two factors (temperature and Cl -ion concentration), which provides a possible evidence for the future design.

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“…Several studies have examined the elimination of DEP using advanced oxidation processes (AOPs) involving the generation of the hydroxyl radical (zOH), such as UV/H 2 O 2 (Xu et al 2007), TiO 2 /UV (Muneer et al 2001), UV/H 2 O 2 / Fe 2 þ (Yang et al 2005) and Fe(III)/solar light (Mailhot et al 2002). These studies agree that the reaction of DEP with zOH is dominant for the removal of DEP, indicating that AOPs are effective processes for removing DEP from water.…”

Section: Introductionmentioning

confidence: 99%

“…To our knowledge, there has been no detailed study of the DEP degradation pathway by ozonation, even though there are a few reports on the identification of the DEP oxidation intermediates formed in UV, Fe(III)/solar light and UV/H 2 O 2 processes (Balabanovich & Schnabel 1998;Mailhot et al 2002;Xu et al 2007). Therefore, this study examined the degradation pathway of DEP by identifying the oxidation intermediates by GC-MS analysis in the ozone process as well as the effect of the intermediates identified (i.e.…”

Section: Introductionmentioning

confidence: 99%

The degradation of diethyl phthalate (DEP) during ozonation: oxidation by-products study

Jung

Oh²,

Kim³

et al. 2009

Journal of Water and Health

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The degradation of diethyl phthalate (DEP) in an aqueous solution during ozonation was investigated by identifying the oxidation intermediates using GC-MS. The experiments were carried out in semi-batch mode with a 1.5 mg l 21-min ozone dose. The proposed degradation pathways were divided into hydrolysis of the aliphatic chain (pathway (A)) and hydroxylation resulting from zOH attack in the aromatic ring (pathway (B)). With increasing ozone dose, the aromatic ring of DEP was opened and acidic compounds, such as malonic acid, succinic acid and glutaric acid were formed. In addition, the ozonation of DEP for 18 min induced hydrogen peroxide (H 2 O 2 ) generation at levels six times higher than pure water. Of the intermediates indentified, phthalic acid (PA) and phthalic anhydride (PAH) enhanced the degradation of DEP by promoting ozone decomposition.

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Photochemical degradation of diethyl phthalate with UV/H2O2

Cited by 151 publications

References 22 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

Evaluation of Ultrasonic Oxidation of Diethyl Phthalate Using Box-Behnken Design with Response Surface Methodology

The degradation of diethyl phthalate (DEP) during ozonation: oxidation by-products study

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