Photolytic degradation of chlorophenols from industrial wastewaters by organic oxidants peroxy acetic acid, para nitro benzoic acid and methyl ethyl ketone peroxide: identification of reaction products

2014 ◽  
Vol 69 (6) ◽  
pp. 1259-1266
Author(s):  
Swati Sharma ◽  
Mausumi Mukhopadhyay ◽  
Zagabathuni Venkata Panchakshari Murthy
Keyword(s):  
Acetic Acid ◽  
Benzoic Acid ◽  
Methyl Ethyl Ketone ◽  
Oxygen Demand ◽  
Chloride Ion ◽  
Methyl Ethyl Ketone Peroxide ◽  
Methyl Ethyl ◽  
Reaction Products ◽  
Ion Release ◽  
Photolytic Degradation

In this investigation, chlorophenol (CP) containing industrial wastewater was remediated by ultraviolet irradiation in conjunction with organic oxidants, peroxy acetic acid (PAA); para nitro benzoic acid (PNBA); and methyl ethyl ketone peroxide (MEKP). CP mineralization was studied with regard to chemical oxygen demand (COD) and chloride ion release under identical test conditions. COD depletion to the extent of 81% by PAA, 66% by PNBA, and 67% by MEKP was noted along with an upwardly mobile trend of chloride ion release upon irradiation of samples at 254 nm. A 90–99% decrease in CP concentration (as per high pressure liquid chromatography (HPLC) analysis) was achieved with an additional 15.0 ml of organic oxidant in all cases. Gas chromatography high resolution mass spectroscopy (GC-HRMS) results also indicated the formation of such reaction products as are free from chlorine substitutions. This treatment also leads to total decolorization of the collected samples.

Investigation of photo-assisted and crude peroxidase mediated transformations of chlorinated phenols (CPs) from spiked and industrial wastewaters: identification of reaction products

2015 ◽  
Vol 72 (5) ◽  
pp. 746-753 ◽  
Author(s):  
Swati Sharma ◽  
Mausumi Mukhopadhyay ◽  
Z. V. P. Murthy
Keyword(s):  
High Resolution Mass Spectrometry ◽  
Oxygen Demand ◽  
Chloride Ion ◽  
Mass Spectrometry Analysis ◽  
Wastewater Sample ◽  
Chlorinated Phenols ◽  
Reaction Products ◽  
Ion Release ◽  
Spectrometry Analysis ◽  
Industrial Wastewaters

This work focused on photo-assisted crude peroxidase mediated transformations of chlorinated phenols (CPs) from spiked and industrial wastewaters and the identification of reaction products formed. Garden radish Raphanus sativus was the source of crude peroxidase. No chlorine bearing compounds were detected by gas chromatography-high resolution mass spectrometry analysis. Under identical test conditions, the concentrations of 4-chlorophenol and 2,4-dichlorophenol were demoted to zero from 514 mg/L, 652 mg/L and that of 2,4,6-trichlorophenol and pentachlorophenol were reduced to 18 mg/L and 37 mg/L from 790 mg/L and 1066 mg/L, respectively (high-pressure liquid chromatography analysis). Chloride ion release profiles also showed a progressively increasing trend. A neat chemical oxygen demand removal to the extent of 63–79% was achieved in the case of spiked wastewater sample and to the extent of 77% for industrial wastewaters. A hypothesis reaction scheme was also suggested to comprehend the mechanism of degradation reactions.

scholarly journals Study of Experimental Investigations in the Presence of Ceramic Waste Powder

2021 ◽  
Vol 57 (4) ◽  
pp. 1-12
Author(s):  
Mohamed Farsane ◽  
Abdellah Anouar ◽  
Souad Chah ◽  
Said Dagdag ◽  
Miloud Bouzziri
Keyword(s):  
Methyl Ethyl Ketone ◽  
Polyester Resin ◽  
Unsaturated Polyester ◽  
Unsaturated Polyester Resin ◽  
Experimental Investigations ◽  
Methyl Ethyl Ketone Peroxide ◽  
Methyl Ethyl ◽  
Gel Time ◽  
Simple Method ◽  
Ceramic Waste

The paper aims to evaluate the gel time and exotherm temperature properties of the curing of unsaturated polyester resin at various amounts of Methyl ethyl ketone peroxide, cobalt octoate and porcelain powder. The gel time of samples are determined using the simple method, while the exotherm temperature are evaluated using the thermocouple. The variation of these properties is discussed theoretically and experimentally.

Selective synthesis and stabilization of peroxides via phosphine oxides

2019 ◽  
Vol 43 (44) ◽  
pp. 17174-17181 ◽  
Author(s):  
Fabian F. Arp ◽  
Shin Hye Ahn ◽  
Nattamai Bhuvanesh ◽  
Janet Blümel
Keyword(s):  
Methyl Ethyl Ketone ◽  
Phosphine Oxide ◽  
Selective Synthesis ◽  
Methyl Ethyl Ketone Peroxide ◽  
Phosphine Oxides ◽  
Methyl Ethyl ◽  
Hydrogen Bonded

MEKPO (methyl ethyl ketone peroxide) and other peroxides can be synthesized selectively and stabilized as hydrogen-bonded phosphine oxide adducts.

scholarly journals Emissions and photochemistry of oxygenated VOCs in urban plumes in the Northeastern United States

2011 ◽  
Vol 11 (14) ◽  
pp. 7081-7096 ◽  
Author(s):  
R. Sommariva ◽  
J. A. de Gouw ◽  
M. Trainer ◽  
E. Atlas ◽  
P. D. Goldan ◽  
...  
Keyword(s):  
United States ◽  
New York ◽  
Acetic Acid ◽  
Methyl Ethyl Ketone ◽  
The United States ◽  
Chemical Mechanism ◽  
Methyl Ethyl ◽  
Photochemical Formation ◽  
Urban Plumes

Abstract. Photochemical processes inside urban plumes in the Northeast of the United States have been studied using a highly detailed chemical model, based upon the Master Chemical Mechanism (MCM). The model results have been compared to measurements of oxygenated VOCs (acetone, methyl ethyl ketone, acetaldehyde, acetic acid and methanol) obtained during several flights of the NOAA WP-3D aircraft, which sampled plumes from the New York City area during the ICARTT campaign in 2004. The agreement between the model and the measurements was within 40–60 % for all species, except acetic acid. The model results have been used to study the formation and photochemical evolution of acetone, methyl ethyl ketone and acetaldehyde. Under the conditions encountered during the ICARTT campaign, acetone is produced from the oxidation of propane (24–28 %) and i-propanol (<15 %) and from a number of products of i-pentane oxidation. Methyl ethyl ketone (MEK) is mostly produced from the oxidation of n-butane (20–30 %) and 3-methylpentane (<40 %). Acetaldehyde is formed from several precursors, mostly small alkenes, >C5 alkanes, propanal and MEK. Ethane and ethanol oxidation account, respectively, for 6–23 % and 5–25 % of acetaldehyde photochemical formation. The results highlight the importance of alkanes for the photochemical production of ketones and the role of hydroperoxides in sustaining their formation far from the emission sources.

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