Fenton degradation of Cartap hydrochloride: identification of the main intermediates and the degradation pathway

2015 ◽  
Vol 72 (7) ◽  
pp. 1198-1205 ◽  
Author(s):  
Kaixun Tian ◽  
Cuixiang Ming ◽  
Youzhi Dai ◽  
Kouassi Marius Honore Ake
Keyword(s):  
Aqueous Medium ◽  
Flue Gas ◽  
High Performance ◽  
Oxygen Demand ◽  
Nitrogen Monoxide ◽  
Degradation Pathway ◽  
Gas Chromatograph ◽  
Gas Analyzer ◽  
Fenton System ◽  
Long Chain

The advanced oxidation of Cartap hydrochloride (Cartap) promoted by the Fenton system in an aqueous medium was investigated. Based on total organic carbon, chemical oxygen demand and high-performance liquid chromatography, the oxidation of Cartap is quite efficient by the Fenton system. Its long chain is easily destroyed, but the reaction does not proceed to complete mineralization. Ion chromatography detection indicated the formation of acetic acid, propionic acid, formic acid, nitrous acid and sulfuric acid in the reaction mixtures. Further evidence of nitrogen monoxide and sulfur dioxide formation was obtained by using a flue gas analyzer. Monitoring by gas chromatograph-mass spectrometer demonstrated the formation of oxalic acid, ethanol, carbon dioxide, and l-alanine ethylamide. Based on these experimental results, plausible degradation pathways for Cartap mineralization in an aqueous medium by the Fenton system are proposed.

scholarly journals Photo-mineralization of azo dye reactive yellow 145 in aqueous medium by TiO2-coated non-woven fibres

2020 ◽  
Vol 10 (2) ◽  
pp. 107-115
Author(s):  
Said Alahiane ◽  
Asma Sennaoui ◽  
Fatima Sakr ◽  
Mohamed Dinne ◽  
Samir Qourzal ◽  
...  
Keyword(s):  
Aqueous Medium ◽  
Hydroxyl Radicals ◽  
Azo Dye ◽  
High Performance ◽  
Batch Reactor ◽  
Oxygen Demand ◽  
Reactive Intermediates ◽  
Organic Load ◽  
Model Molecule ◽  
Reactor Operating

This study aims the degradation of the Reactive Yellow 145 dye (RY 145), chosen as a model molecule in aqueous solution. Photocatalytic experiments have been conducted at ambient temperature in a lab-scale batch reactor, operating with TiO2 catalyst supported on paper in an aqueous medium. The ultraviolet irradiation was provided by using an artificial source. The evolution of the pollutant concentration has been followed over time by spectrophotometry and high-performance liquid chromatography (HPLC). The Mineralization and identification of reactive intermediates products were also studied. The results obtained indicate that TiO2 has the most interesting photocatalytic properties and that the measurement of the Chemical Oxygen Demand (COD) has an important abatement of the organic load of an order of 89.13%. The identification of photoproducts helped to better understand the mechanism of the molecule attack by hydroxyl radicals.

High-Performance Solution-Processed n-Channel Organic Thin-Film Transistors Based on a Long Chain Alkyl-Substituted C60Derivative

2010 ◽  
Vol 3 (10) ◽  
pp. 101601 ◽  
Author(s):  
Yoshinori Horii ◽  
Koichi Sakaguchi ◽  
Masayuki Chikamatsu ◽  
Reiko Azumi ◽  
Kiyoshi Yase ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Film Transistors ◽  
High Performance ◽  
Organic Thin Film Transistors ◽  
Organic Thin Film ◽  
Solution Processed ◽  
Long Chain

Field study on N2O emission from subsurface wastewater infiltration system under variable loading rates and drying-wetting cycles

2017 ◽  
Vol 76 (8) ◽  
pp. 2158-2166 ◽  
Author(s):  
Ying-Hua Li ◽  
Hai-Bo Li ◽  
Xin-Yang Xu ◽  
Si-Yao Xiao ◽  
Si-Qi Wang ◽  
...  
Keyword(s):  
Field Study ◽  
Conversion Rate ◽  
Oxygen Demand ◽  
N2o Emission ◽  
Conversion Ratio ◽  
Gas Chromatograph ◽  
Variable Loading ◽  
N2o Production ◽  
Loading Rates ◽  
Operation Conditions

In this field study, the impacts of influent loadings and drying-wetting cycles on N2O emission in a subsurface wastewater infiltration (SWI) system were investigated. N2O emitted under different operation conditions were quantified using static chamber and gas chromatograph techniques. N2O conversion rate decreased from 6.6 ± 0.1% to 2.7 ± 0.1% with an increase in hydraulic loading (HL) from 0.08 to 0.24 m3/m2·d. By contrast, N2O conversion rate increased with increasing pollutant loading (PL) up to 8.2 ± 0.5% (PL 4.2 g N/m2·d) above which conversion rate decreased, confirming that N2O production was under the interaction of nitrification and denitrification. Taking into consideration the pollutants (chemical oxygen demand (COD), NH4+-N, NO3−-N and total nitrogen (TN)) removal ratio and N2O emission, optimal loading ranges and drying-wetting modes were suggested as HL 0.08–0.12 m3/m2·d, PL 3.2–3.7 g N/m2·d and 12 h:12 h, respectively. The results revealed that in SWI systems, conversion ratio of influent nitrogen to N2O could be between 4.5% and a maximum of 7.0%.

Kinetic model for calcium sulfate α-hemihydrate produced hydrothermally from gypsum formed by flue gas desulfurization

2015 ◽  
Vol 48 (3) ◽  
pp. 827-835 ◽  
Author(s):  
Mingliang Tang ◽  
Xuerun Li ◽  
Yusheng Shen ◽  
Xiaodong Shen
Keyword(s):  
Flue Gas ◽  
Calcium Sulfate ◽  
High Performance ◽  
Transformation Process ◽  
Flue Gas Desulfurization ◽  
Synthesis Process ◽  
Stable Phase ◽  
Hydrothermal Conditions ◽  
Simple Method ◽  
Kinetics Of

Modeling of the kinetics of the synthesis process for calcium sulfate α-hemihydrate from gypsum formed by flue gas desulfurization (FGD) is important to produce high-performance products with minimal costs and production cycles under hydrothermal conditions. In this study, a model was established by horizontally translating the obtained crystal size distribution (CSD) to the CSD of the stable phase during the transformation process. A simple method was used to obtain the nucleation and growth rates. A nonlinear optimization algorithm method was employed to determine the kinetic parameters. The model can be successfully used to analyze the transformation kinetics of FGD gypsum to α-hemihydrate in an isothermal batch crystallizer. The results showed that the transformation temperature and stirring speed exhibit a significant influence on the crystal growth and nucleation rates of α-hemihydrate, thus altering the transformation time and CSD of the final products. The characteristics obtained by the proposed model can potentially be used in the production of α-hemihydrate.

Aqueous Biphasic System Containing Long Chain Anion-Functionalized Ionic Liquids for High-Performance Extraction

2015 ◽  
Vol 3 (12) ◽  
pp. 3365-3372 ◽  
Author(s):  
Yuanbang Xie ◽  
Huabin Xing ◽  
Qiwei Yang ◽  
Zongbi Bao ◽  
Baogen Su ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
High Performance ◽  
Biphasic System ◽  
Aqueous Biphasic System ◽  
Aqueous Biphasic ◽  
Chain Anion ◽  
Long Chain

scholarly journals Production of free radicals by the Co2+/Oxone system to carry out diclofenac degradation in aqueous medium

2018 ◽  
Vol 78 (10) ◽  
pp. 2131-2140 ◽  
Author(s):  
Oscar M. Rodríguez-Narváez ◽  
Oracio Serrano-Torres ◽  
Kazimierz Wrobel ◽  
Enric Brillas ◽  
Juan M. Peralta-Hernandez
Keyword(s):  
Free Radicals ◽  
High Performance ◽  
Hplc Analysis ◽  
Apparent Rate Constant ◽  
Oxygen Demand ◽  
Co2 Concentration ◽  
Oh Radicals ◽  
Order Kinetic ◽  
Kinetic Reaction ◽  
Ion Exclusion

Abstract This paper reports the degradation of a solution of 0.314 mM diclofenac (DCF), while using 5–15 mM Oxone as oxidizing agent with the catalytic action of 0.05–0.2 mM Co2+. The best performance was obtained for 10 mM Oxone and 0.2 mM Co2+, achieving the total DCF abatement and 77% removal of chemical oxygen demand after 30 min. Oxidizing of sulfate () and hydroxyl (•OH) radicals was formed by the Co2+/Oxone system. Oxone was firstly oxidized to persulfate ion that was then quickly converted into the above free radicals. For Oxone contents ≥10 mM, the decay of DCF concentration followed a second-order kinetic reaction, but the apparent rate constant changed with the Co2+ concentration used. High-performance liquid chromatography (HPLC) analysis of treated solutions showed the formation of some intermediates, whereas oxalic acid was identified as the prevalent final short-linear carboxylic acid by ion-exclusion HPLC.

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