scholarly journals Degradation of Bisphenol A in an Aqueous Solution by a Photo-Fenton-Like Process Using a UV KrCl Excilamp

2021 ◽  
Vol 18 (3) ◽  
pp. 1152
Author(s):  
Denis Aseev ◽  
Agniya Batoeva ◽  
Marina Sizykh ◽  
Daniil Olennikov ◽  
Galina Matafonova
Keyword(s):  
Bisphenol A ◽  
High Performance ◽  
Aqueous Media ◽  
Chain Mechanism ◽  
Efficient Removal ◽  
Radical Chain ◽  
First Order ◽  
Degradation Rates ◽  
Endocrine Disrupting ◽  
Flow Through

Bisphenol A (BPA), a precursor to important plastics, is regarded as a common aquatic micropollutant with endocrine-disrupting activity. In the present study, we explored the capability of a UV KrCl excilamp (222 nm) to degrade BPA by a photo-Fenton-like process using persulfate under flow-through conditions. The first-order rate constants of degradation were obtained and the mineralization of dissolved organic carbon (DOC) was estimated. The results showed complete BPA degradation and high DOC mineralization (70–97%). A comparative analysis of degradation rates and DOC removal in the examined systems (UV, Fe2+/S2O82−, UV/S2O82− and UV/Fe2+/S2O82−) revealed a significant synergistic effect in the photo-Fenton-like system (UV/Fe2+/S2O82−) without the accumulation of toxic intermediates. This indicated that the BPA was oxidized via the conjugated radical chain mechanism, which was based on the photo-induced and catalytic processes involving HO• and SO4−• radicals. The primary intermediates of BPA degradation in the UV/Fe2+/S2O82− system were identified by HPLC/MS and the oxidation pathway was proposed. The high performance of the photo-Fenton-like process employing a quasi-monochromatic UV radiation of a KrCl excilamp offers promising potential for an efficient removal of such micropollutants from aqueous media.

Migration Study of Bisphenol A from Tea Bottle of Polycarbonate Plastic to Tea Water

2013 ◽  
Vol 821-822 ◽  
pp. 929-932 ◽  
Author(s):  
Xue Hui Cao ◽  
Shu Juan Ji
Keyword(s):  
Bisphenol A ◽  
Epoxy Resins ◽  
High Performance ◽  
Black Tea ◽  
Heating Time ◽  
High Concentration ◽  
Endocrine Disrupting Chemical ◽  
Jasmine Tea ◽  
Migration Study ◽  
Endocrine Disrupting

Bisphenol A (BPA) is an important organic intermediate that is an estrogen and an environmental endocrine disrupting chemical. Bisphenol A is used widely in the production of consumer goods, polycarbonate plastics, epoxy resins. A large amount of studies have indicated that BPA might affect human health. In this work, four different tea (Tieguanyin tea, Black tea, Maofeng tea, Jasmine tea) were tested to verify if they were able to increase the BPA release from the PC cup. High performance liquid chromatography (HPLC) with fluorescence detection (FLD) was used to quantify BPA. Result showed that the heating time and temperature could have an influence on BPA migration from polycarbonate plastic. BPA migrated into tea water from polycarbonate plastic, especially when heated to high temperatures. Relatively high levels of BPA were found to be released into food simulants water from high concentration tea water.

scholarly journals A multivariate study of the rGO/g-C3N4 composite for the photocatalytic degradation of bisphenol A: Characterization, degradation kinetics, products identification, and ecotoxicity

2021 ◽  
Author(s):  
Chubraider Xavier ◽  
Bianca Rebelo Lopes ◽  
Caue Ribeiro ◽  
Eduardo Bessa Azevedo
Keyword(s):  
Bisphenol A ◽  
Degradation Products ◽  
Degradation Kinetics ◽  
Surface Response Methodology ◽  
First Order ◽  
Surface Areas ◽  
First Order Kinetics ◽  
Reduced Graphene ◽  
Endocrine Disrupting ◽  
Oxidation Agent

Abstract Bisphenol A (BPA), a common polymer plasticizer, is a contaminant of emerging concern with endocrine disrupting activity. Among existing abatement methods, photodegradation demands easily fabricated, inexpensive, high photoactive catalysts, leading to non-toxic byproducts after degradation. It is proposed an optimized (surface response methodology) catalyst for those goals: graphitic carbon nitride impregnated with reduced graphene oxide. The method was based on the sonication of preformed particles followed by reduction with hydrazine in reflux, a methodology that allows for better reproducibility and larger specific surface areas. The catalyst removed 90% of BPA (100 mL, 100 µg L− 1) in 90 min under UV irradiation (365 nm, 26 W) compared to 50% with pure g-C3N4 (pseudo-first-order kinetics). Tests with radicals scavengers revealed that superoxide radical was the main oxidation agent in the system. By mass spectrometry, two major degradation products were identified, which were less ecotoxic than BPA towards a series of organisms, according to in silico estimations performed with the ECOSAR 2.0 software.

The thermal decomposition of trimethylacetyl bromide

1970 ◽  
Vol 23 (3) ◽  
pp. 525 ◽  
Author(s):  
BS Lennon ◽  
VR Stimson
Keyword(s):  
Thermal Decomposition ◽  
Carbon Monoxide ◽  
Hydrogen Bromide ◽  
Transition States ◽  
Volume Ratio ◽  
Reaction Vessel ◽  
Chain Mechanism ◽  
Radical Chain ◽  
First Order ◽  
Polar Transition

Trimethylacetyl bromide decomposes at 298-364� into isobutene, carbon monoxide, and hydrogen bromide in a first-order manner with rate given by k1 = 138 x 1014exp(-48920/RT) sec-1 The rate is unaffected by addition of the products or of inhibitors, or by increase of the surface/volume ratio of the reaction vessel. The likely radical chain mechanism is considered and rejected. The reaction is believed to be a molecular one, and possible cyclic and polar transition states are discussed.

A field-study of leaching and degradation of nine pesticides in a sandy soil

Soil Research ◽  
1995 ◽  
Vol 33 (6) ◽  
pp. 1019 ◽  
Author(s):  
RS Kookana ◽  
HJ Di ◽  
LAG Aylmore
Keyword(s):  
Field Study ◽  
Sandy Soil ◽  
Water Contamination ◽  
High Performance ◽  
Dilute Solution ◽  
Ground Water Contamination ◽  
First Order ◽  
Degradation Rates ◽  
Residue Concentration ◽  
Different Depths

A field study was conducted on a coastal sandy soil (Karrakata sand) of Western Australia from July to December 1990, to measure the leaching and degradation rates of chlorpyriphos, chlorthal dimethyl, fenamiphos, linuron, metalaxyl, metribuzin, prometryne, propyzamide and simazine. Commercial grade products were sprayed in dilute solution form at recommended rates to the surface of held plots. Irrigation was applied daily which together with rainfall gave effective rainfall equivalent to at least 120% of potential evaporation. Pesticide residue concentrations in soil samples taken at 5 cm increments down to 50 cm, at different days after application, were determined by high performance liquid chromatography (HPLC). Mean leaching depths (MLDs) were calculated by weighting the percentage residues remaining at different depths in the soil profile. The MLDs for the 5 month period followed the order: chlorpyriphos and chlorthal dimethyl (<5 cm) < linuron and simazine (6) < propyzamide (8) and prometryne (9) < metribuzin (12) < metalaxyl (18) < fenamiphos and metabolites (28). This generally corresponded inversely with the sorption coefficients (K-oc). The degradation rates (i.e. decreases with time of total residue concentration in the sampled profile) could mostly be described by first-order regressions (R(2) = 0.59-0.95). Calculated half-lives showed the order: metribuzin (27 days), simazine (28) < fenamiphos (43), chlorthal dimethyl (45) < prometryne (58), propyzamide (59) < metalaxyl (70) < chlorpyriphos (81) < fenamiphos plus metabolites (98) < linuron (219). The potential for causing ground water contamination, as indicated by the ratio of half-life to Koc followed the order: chlorthal dimethyl, chlorpyriphos < metribuzin, prometryne < simazine, propyzamide < linuron < metalaxyl < fenamiphos and metabolites.

Kinetics and mechanisms of the pyrolysis of diethyl ether I. The uninhibited reaction

1964 ◽  
Vol 278 (1375) ◽  
pp. 505-516 ◽  
Keyword(s):  
Diethyl Ether ◽  
Chain Process ◽  
Chain Mechanism ◽  
Radical Chain ◽  
Elementary Reactions ◽  
First Order ◽  
First Order Kinetics ◽  
Steady State Rate ◽  
State Rate ◽  
Radical Chain Process

The uninhibited thermal decomposition of diethyl ether was studied from 560 to 620 °C and at pressures ranging from 15 to 320 mmHg . The order of the overall reaction was between 1 and 3/2, the order being greater the higher the pressure. Analytical and kinetic data provide strong evidence that there is a molecular split of diethyl ether into ethanol and ethylene. The reaction leading to acetaldehyde and ethane, on the other hand, is concluded to be almost entirely a free-radical chain process. A detailed chain mechanism is postulated, involving first-order initiation and the reaction between C 2 H 5 and CH 2 CH 2 OC 2 H 5 as the chain-ending step. This mechanism is shown to give a steady-state rate equation which leads to first-order kinetics at lower ether pressures and three-halves-order kinetics at higher ones. The kinetic results lead to activation energies which are in satisfactory agreement with values calculated on the basis of the elementary reactions.

scholarly journals Immobilization of laccase on magnetically separable biochar for highly efficient removal of bisphenol A in water

RSC Advances ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 4795-4804 ◽  
Author(s):  
Yu Zhang ◽  
Mingyue Piao ◽  
Lingzhi He ◽  
Lan Yao ◽  
Tiezhu Piao ◽  
...  
Keyword(s):  
Bisphenol A ◽  
High Performance ◽  
Cost Effective ◽  
Efficient Removal ◽  
Magnetic Biochar ◽  
Highly Efficient ◽  
Magnetically Separable ◽  
Bpa Removal

Laccase was stably immobilized on a cost effective and nanosized magnetic biochar (L-MBC) by adsorption, precipitation and crosslinking, and it was used for high performance BPA removal.

The oxidation of phenol and chlorophenols by manganate(VI) ion

1981 ◽  
Vol 59 (18) ◽  
pp. 2780-2786 ◽  
Author(s):  
Donald G. Lee ◽  
Carlos F. Sebastián
Keyword(s):  
Free Radical ◽  
Fractional Order ◽  
Reaction Rate ◽  
Acid Catalysis ◽  
Chain Mechanism ◽  
Radical Chain ◽  
First Order ◽  
Alkaline Conditions ◽  
Oxidation Of Phenol ◽  
Kinetics Of

The kinetics of the oxidation of phenol and three chlorophenols have been studied under alkaline conditions. Although the reaction is first order with respect to the oxidant it exhibits a fractional order with respect to the substrates, thus suggesting a free radical chain mechanism (eqs. [3]–[7]). The inverse dependence of the reaction rate on base concentration has been attributed to acid catalysis of the chain initiating step.

scholarly journals Robust Aluminium and Iron Phosphinate Metal-Organic Frameworks for Efficient Removal of Bisphenol A

2020 ◽  
Author(s):  
Daniel Bůžek ◽  
Soňa Ondrušová ◽  
Jan Hynek ◽  
Petr Kovář ◽  
Kamil Lang ◽  
...  
Keyword(s):  
Bisphenol A ◽  
Chemical Nature ◽  
Endocrine Disrupting Chemicals ◽  
Fine Tuning ◽  
Efficient Removal ◽  
Surface Areas ◽  
Endocrine Disrupting ◽  
Metal Organic ◽  
Hydrophobic Nature ◽  
Global Threat

Herein, we introduce a new series of highly stable MOFs, constructed using Fe<sup>3+</sup> and Al<sup>3+</sup> metal ions and bisphosphinate linkers. The isoreticular design leads to ICR-2, ICR-4, ICR-6, and ICR-7 MOFs with a honeycomb arrangement of linear pores, surface areas up to 1360 m<sup>2</sup> g<sup>-1</sup>, and high solvothermal stability. In most cases, their sorption capacity is retained even after 24 h reflux in water. The choice of the linkers allows fine tuning of the pore sizes and the chemical nature of the pores. This feature can be utilized for optimization of host-guest interactions between molecules and pore walls. Water pollution by various endocrine disrupting chemicals has been considered as a global threat to public health. In this work, we proved that the chemical stability and the hydrophobic nature of the synthesized series of MOFs result in remarkable sorption properties of these materials for neurodisruptor bisphenol A.<br>

scholarly journals Robust Aluminium and Iron Phosphinate Metal-Organic Frameworks for Efficient Removal of Bisphenol A

2020 ◽  
Author(s):  
Daniel Bůžek ◽  
Soňa Ondrušová ◽  
Jan Hynek ◽  
Petr Kovář ◽  
Kamil Lang ◽  
...  
Keyword(s):  
Bisphenol A ◽  
Chemical Nature ◽  
Endocrine Disrupting Chemicals ◽  
Fine Tuning ◽  
Efficient Removal ◽  
Surface Areas ◽  
Endocrine Disrupting ◽  
Metal Organic ◽  
Hydrophobic Nature ◽  
Global Threat

Herein, we introduce a new series of highly stable MOFs, constructed using Fe<sup>3+</sup> and Al<sup>3+</sup> metal ions and bisphosphinate linkers. The isoreticular design leads to ICR-2, ICR-4, ICR-6, and ICR-7 MOFs with a honeycomb arrangement of linear pores, surface areas up to 1360 m<sup>2</sup> g<sup>-1</sup>, and high solvothermal stability. In most cases, their sorption capacity is retained even after 24 h reflux in water. The choice of the linkers allows fine tuning of the pore sizes and the chemical nature of the pores. This feature can be utilized for optimization of host-guest interactions between molecules and pore walls. Water pollution by various endocrine disrupting chemicals has been considered as a global threat to public health. In this work, we proved that the chemical stability and the hydrophobic nature of the synthesized series of MOFs result in remarkable sorption properties of these materials for neurodisruptor bisphenol A.<br>

Preparation of Titanium-Oxide-Coated Polypropylene Granules for Photooxidation of Organic Pollutant

2013 ◽  
Vol 717 ◽  
pp. 101-107
Author(s):  
H.S. Shin ◽  
D.S. Rhee
Keyword(s):  
Methylene Blue ◽  
Titanium Dioxide ◽  
Organic Pollutant ◽  
Solar Irradiation ◽  
Order Kinetic ◽  
First Order ◽  
Degradation Rates ◽  
Order Kinetic Model ◽  
Flow Through ◽  
Pseudo First Order

Titanium dioxide was coated onto buoyant polypropylene granules. Titanium dioxide coated polypropylene granules (TCPG) had high mechanical and attritional stability as well as appreciable photocatalytic activity under solar irradiation. Chosen model pollutant, Methylene Blue (MB) could be totally decolorized and partially mineralized within 3 h of treatment. TCPG might successfully be applied as suspended in the column flow-through system. Degradation rates depended strongly on pH, initial dye concentration, and optimal media dosage, following pseudo-first-order kinetic model.

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