degradation kinetic of dibutyl phthalate (dbp) by sulfate

degradation kinetic of dibutyl phthalate (dbp) by sulfate

Degradation kinetic of dibutyl phthalate (DBP) by sulfate

Dibutyl phthalate (DBP) one of the most widely used PAEs was chosen as the model pollutant in this study and the major objectives of this study were therefore to (1) discuss the degradation kinetics of DBP by the UV/PS process and the influences of solution parameters, such as initial PS or DBP concentrations, radical scavengers (methanol (MeOH) and tert-butyl (TBA)), solution pH value

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degradation kinetic of dibutyl phthalate (dbp) by sulfate

Degradation kinetic of dibutyl phthalate (DBP) by sulfate

Degradation kinetic of dibutyl phthalate (DBP) by sulfate radical- and hydroxyl radical-based advanced oxidation process in UV/persulfate system Author links open overlay panel Ziying Wang a Yisheng Shao a b Naiyun Gao a Na An a

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degradation kinetic of dibutyl phthalate (dbp) by sulfate

Degradation kinetic of dibutyl phthalate (DBP) by sulfate

The second-order rate constant of (1.2 ± 0.1) × 108 M−1 s−1 between DBP and SO4− and the second-order rate constant of (6.3 ± 0.1) × 109 M−1 s−1 between DBP and HO were determined by competition kinetics. The degradation efficiency of DBP was affected by PS dosage, initial DBP concentration, solution pH value, natural organic

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degradation kinetic of dibutyl phthalate (dbp) by sulfate

Degradation kinetic of dibutyl phthalate (DBP) by sulfate

Degradation kinetic of dibutyl phthalate (DBP) by sulfate radical- and hydroxyl radical-based advanced oxidation process in UV/persulfate system December 2017 Separation and Purification

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theoretical investigation on the degradation of dibutyl

Theoretical investigation on the degradation of dibutyl

Degradation kinetic of dibutyl phthalate (DBP) by sulfate radical- and hydroxyl radical-based advanced oxidation process in UV/persulfate system Sep. Purif. Technol. , 195 ( 2018 ) , pp. 92 - 100

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degradation of dibutyl phthalate (dbp) by uv-254 nm/h 2 o 2

Degradation of dibutyl phthalate (DBP) by UV-254 nm/H 2 O 2

Degradation of dibuytl phthalate (DBP), a plasticizer and also a widely distributed endocrine disruptor, by UV-254 nm/H<sub>2</sub>O<sub>2</sub> advanced oxidation process (AOP) was investigated in this study. A significant DBP removal of 77.1 % at an initial concentration of 1.0 μM was achieved at …

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degradation kinetic of phthalate esters and the formation of

Degradation kinetic of phthalate esters and the formation of

Abstract The degradation kinetics of two phthalate esters (PAEs) (i.e., diethyl phthalate (DEP) and dibutyl phthalate (DBP)) in heat-activated persulfate (PS) system were studied and followed pseudo-first-order kinetics. Results demonstrated that both sulfate radical ( SO 4 - · ) and hydroxyl radical (HO ) were responsible for degrading DEP and DBP. The pseudo-first-order rate constant (kobs

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degradation of dibutyl phthalate (dbp) by a bacterial

Degradation of dibutyl phthalate (DBP) by a bacterial

1. Introduction. Phthalate esters (PAEs), a class of toxic anthropogenic compounds, have been predominantly used as additives or plasticizers to increase flexibility, transparency and durability of plastic materials since 1930s (Farahani et al., 2008; Cao, 2010).

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comparative study on the degradation of dibutyl phthalate by

Comparative study on the degradation of dibutyl phthalate by

2.5. Kinetics of DBP degradation by strains 21b and strain 51F. Kinetics of DBP degradation studies were carried out in 100 ml of sterile MSM containing trace element solution (pH adjusted to 6.8) with 1% inoculum. DBP at 1000–2000 mg/L concentration was added to the flasks as sole carbon source and no other carbon source was provided.

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reaction pathway and oxidation mechanisms of dibutyl

Reaction pathway and oxidation mechanisms of dibutyl

The DBP degradation was studied at three pH values (acidic, neutral and basic) in the presence of different organic scavengers. Using a chemical probe method, both sulfate radical (SO4(-)) and hydroxyl radical (·OH) were found to be primary oxidants at pH3.0 and pH7.0, respectively while ·OH was the major specie to oxidize DBP at pH11.0.

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biodegradation of endocrine disruptor dibutyl phthalate (dbp

Biodegradation of endocrine disruptor dibutyl phthalate (DBP

V29b. Four metabolic intermediates, dibutyl phthalate (DBP), monobutyl phthalate, phthalic acid and pyrocate-chol, were identified. Based on the metabolic intermediates identified, a chemical pathway for DBP degradation was proposed. Six genes for phthalic acid degradation were identified from the genome of Methylobacillus sp. V29b. Keywords

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biodegradation of endocrine disruptor dibutyl phthalate (dbp

Biodegradation of endocrine disruptor dibutyl phthalate (DBP

DBP dibutyl phthalate, MBP monobutyl phthalate, PA phthalic acid, PC pyrocatechol +1 A proposed biochemical pathway for DBP degradation by Methylobacillus sp. V29b.

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biodegradation of benzyl butyl phthalate and dibutyl

Biodegradation of benzyl butyl phthalate and dibutyl

This study investigated the kinetics of biomass growth and biodegradation of benzyl butyl phthalate (BBP) and dibutyl phthalate (DBP) by Arthrobacter sp. in a surfactant-aided batch system. The effect of different surfactants on aqueous solubility of BBP and DBP was initially examined, which showed that Tween 80 resulted in maximum

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carbon and hydrogen isotope fractionation of phthalate esters

Carbon and hydrogen isotope fractionation of phthalate esters

Three PAEs presented different degradation kinetic behaviors. For DEP and DBP, rate constants at pH = 2 are larger than those at pH = 7, which is consistent with previous results of Li et al. indicating that acidic condition had positive effect on DBP degradation due to the predominant radical species of SO 4 −. However, DMP seems to show a

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theoretical investigation on the degradation of dibutyl

Theoretical investigation on the degradation of dibutyl

Abstract Phthalate esters and their OH-addition products are considered to pose health risks to aquatic organisms. In this work, the aquatic conversion mechanism, kinetics and ecotoxicity assessment of dibutyl phthalate were studied in a theoretical way. The results from the initial reaction of dibutyl phthalate by OH and SO 4 · - show that the H-abstraction occurring in –COOC4H9 groups is

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water | free full-text | effects of persulfate activation

Water | Free Full-Text | Effects of Persulfate Activation

The study compares zero-valent iron–persulfate with a pyrite–persulfate system to degrade three PAEs—di(2-ethylhexyl) phthalate (DEHP), dibutyl phthalate (DBP), and dimethyl phthalate (DMP). Column experiments were conducted, and rapid oxidation occurred in a pyrite–persulfate system due to sulfate radical generation.

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degradation of dibutyl phthalate (dbp) by uv-254 nm/h2o2

Degradation of dibutyl phthalate (DBP) by UV-254 nm/H2O2

Degradation of dibuytl phthalate (DBP), a plasticizer and also a widely distributed endocrine disruptor, by UV-254 nm/H2O2 advanced oxidation process (AOP) was investigated in this study. A significant DBP removal of 77.1 % at an initial concentration of 1.0 μM was achieved at UV fluence of 160 mJ/cm2, initial H2O2 dosage of 1.0 mM, and pH of 7.6 ± 0.1. The DBP degradation exhibited a pseudo

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theoretical investigation on the degradation of dibutyl

Theoretical investigation on the degradation of dibutyl

Abstract Phthalate esters and their OH-addition products are considered to pose health risks to aquatic organisms. In this work, the aquatic conversion mechanism, kinetics and ecotoxicity assessment of dibutyl phthalate were studied in a theoretical way. The results from the initial reaction of dibutyl phthalate by OH and SO 4 · - show that the H-abstraction occurring in –COOC4H9 groups is

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comparative study on the degradation of dibutyl phthalate by

Comparative study on the degradation of dibutyl phthalate by

PDF | Dibutyl phthalate is (DBP) the top priority toxicant responsible for carcinogenicity, teratogenicity and endocrine disruption. This study | Find, read and cite all the research you need

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biodegradation of benzyl butyl phthalate and dibutyl

Biodegradation of benzyl butyl phthalate and dibutyl

This study investigated the kinetics of biomass growth and biodegradation of benzyl butyl phthalate (BBP) and dibutyl phthalate (DBP) by Arthrobacter sp. in a surfactant-aided batch system. The effect of different surfactants on aqueous solubility of BBP and DBP was initially examined, which showed that Tween 80 resulted in maximum

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dft studies on the reaction mechanism and kinetics of dibutyl

DFT studies on the reaction mechanism and kinetics of dibutyl

In this study, the reaction mechanism and kinetics of dibutyl phthalate (DBP) initiated by hydroxyl (OH) and sulfate radicals (SO4⁻) were investigated at the CAM-B3LYP/6-311 + G(d,p) level

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biodegradation of an endocrine-disrupting chemical di-n-butyl

Biodegradation of an endocrine-disrupting chemical di-n-butyl

An aerobic bacterial strain M11 capable of degrading dibutyl phthalate (DBP) was isolated and identified as Camelimonas sp. This strain could not grow on dialkyl phthalates, including dimethyl, diethyl, dipropyl, dibutyl and dipentyl phthalate, but suspensions of cells could transform these compounds to phthalate via corresponding monoalkyl phthalates. The degradation kinetics of DBP was best

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biochemical pathways and enhanced degradation of dioctyl

Biochemical pathways and enhanced degradation of dioctyl

The degradation pathways were inferred as shown in Figure 3. 2-ethylhexyl phthalate (DEHP) was first decomposed into dibutyl phthalate (DBP), then hydrolyzed to diethyl phthalate (DEP), which was converted into phthalic acid (PA) through continuous deesterification. Phthalic acid (PA) is oxidized, dehydrogenated and decarboxylated to produce

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anaerobic degradation of diethyl phthalate, di-n-butyl

Anaerobic degradation of diethyl phthalate, di-n-butyl

The respective anaerobic degradation rate constants for DEP, DBP, and DEHP were observed as 0.045, 0.074, and 0.027 1/day, with respective half-lives of 15.4, 9.4, and 25.7 days under optimal conditions of 30 degrees C and pH7.0.

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