Degradation of dibutyl phthalate (DBP) by UV-254 nm/H
Degradation of dibuytl phthalate (DBP), a plasticizer and also a widely distributed endocrine disruptor, by UV-254 nm/H 2 O 2 advanced oxidation process (AOP) was investigated in this study.
Degradation of dibutyl phthalate (DBP) by UV-254 nm/H 2 O 2
The DBP degradation exhibited a pseudo-first-order reaction kinetic pattern, with the rate constants linearly increasing with increasing H 2 O 2 dosage while decreasing with increasing initial DBP concentration and pH value in a specific range.
Degradation kinetic of dibutyl phthalate (DBP) by sulfate
Degradation of DBP in the UV/PS system. Conditions: [DBP] 0 = 1 μM, [PS] 0 = 200 μM; all solutions were unbuffered with initial pH of 5.99 or 6.50 with or without PS, respectively; I 0 /V = 0.21 μE s 1 L 1. Note that the experiments were performed in duplicate and the results were the average values with deviations of less than 5%. 3.2.
Degradation of dibutyl phthalate (DBP) by UV-254 nm/H O
Abstract Degradationofdibuytlphthalate(DBP),aplasticiz- er and also a widely distributed endocrine disruptor, by UV- 254 nm/H 2O 2advanced oxidation process (AOP) was inves- tigated in this study. A significant DBP removal of 77.1 % at aninitialconcentrationof1.0μMwasachievedatUVfluence of 160 mJ/cm2,initialH 2O
Degradation of dibutyl phthalate by homogeneous
The degradation of dibutyl phthalate (DBP) photoinduced by Fe (III) in aqueous solution has been investigated under monochromatic irradiation and sunlight. Hydroxyl radicals OH, responsible of the degradation, are formed via an intramolecular photoredox process in excited Fe (III) aquacomplexes.
- Does UV/PS degrade DBP?
- UV/PS process showed a high efficiency to degrade DBP. DBP degradation was adversely affected by initial DBP dosage, pH, NOM and HCO 3 -. The degradation was promoted by PS and Cl − below the critical PS and Cl − dosage. A simple steady-state kinetic model was developed. Both OH and SO 4 existed in the system with OH·contributing more.
- What affects the degradation efficiency of DBP?
- The degradation efficiency of DBP was affected by PS dosage, initial DBP concentration, solution pH value, natural organic matter (NOM) and inorganic anions. Increasing PS dosage could enhance the degradation of DBP before PS dosage reaching 1.6 mM.
- What is K O of DBP degradation under varying pH values?
- Apparent experimental and model predicted pseudo-first-order rate constants (k o) of DBP degradation under varying pH values in the UV/PS systems (a) and the model predicted steady-state SO 4− and/or HO concentrations under various pH values (b). Conditions: [PS] 0 = 200 μM, [DBP] 0 = 1 μM, 2 mM phosphate buffer, I 0 /V = 0.21 μE s −1 L −1.
- Why does DBP degradation change at lower pH levels?
- The insignificant change of the degradation of DBP as pH changed at lower levels might be probably result from the unchanged radical quantum yield during PS photolysis at this pH range .
- Does increasing PS dosage increase the degradation of DBP?
- Increasing PS dosage could enhance the degradation of DBP before PS dosage reaching 1.6 mM. However, the pseudo-first-order rate constants (k o) decreased as initial DBP concentration increased probably owing to the radical scavenging effect of DBP.
- What is a steady-state kinetic model for dibutyl phthalate?
- A simple steady-state kinetic model was developed. Both OH and SO 4 existed in the system with OH·contributing more. The ultraviolet/persulfate (UV/PS) process was used to degrade dibutyl phthalate (DBP) at different reaction conditions and a steady-state kinetic model was established based on the elementary reactions involved as well.
