scholarly journals Solid State Electrochemical Oxidation Mechanisms Of Morin in Aqueous Media

2005 ◽  
Vol 17 (9) ◽  
pp. 733-738 ◽  
Author(s):  
Patricia Janeiro ◽  
Ana?Maria?Oliveira Brett
Keyword(s):  
Solid State ◽  
Electrochemical Oxidation ◽  
Aqueous Media ◽  
Oxidation Mechanisms

Solid State Electrochemical Oxidation of Some Bisphosphoramidates in Aqueous Media and their Applications in DNA Sensing

2015 ◽  
Vol 28 (3) ◽  
pp. 601-610 ◽  
Author(s):  
Mohammad Bagher Gholivand ◽  
Leila Mohammadi-Behzad ◽  
Giti Paimard ◽  
Khodayar Gholivand ◽  
Akram Gholami
Keyword(s):  
Solid State ◽  
Electrochemical Oxidation ◽  
Aqueous Media ◽  
Dna Sensing

Cucurbituril Based Luminescent Materials in Aqueous Media and Solid State

2021 ◽  
Author(s):  
Shubhra Kanti Bhaumik ◽  
Rakesh Biswas ◽  
Supratim Banerjee
Keyword(s):  
Solid State ◽  
Aqueous Media ◽  
Luminescent Materials

Miniaturisation and simplification of solid-state proton activity sensors for non-aqueous media and ionic liquids

The Analyst ◽  
2015 ◽  
Vol 140 (3) ◽  
pp. 889-894 ◽  
Author(s):  
Orawan Winther-Jensen ◽  
Jessie L. Hamilton ◽  
Chun H. Ng ◽  
Bartlomiej Kolodziejczyk ◽  
Bjorn Winther-Jensen
Keyword(s):  
Ionic Liquids ◽  
Solid State ◽  
Water Content ◽  
Aqueous Media ◽  
Activity Sensors ◽  
Proton Activity

Solid-state proton activity sensors capable of measuring the proton activity of non-aqueous media and ionic liquids regardless of their hydrophobicity and water content were miniaturised and simplified.

scholarly journals Electrochemical oxidation of m-cresol purple dye in aqueous media

2015 ◽  
Vol 50 (4) ◽  
pp. 305-313
Author(s):  
Sajjad Khezrianjoo ◽  
Hosakere Doddarevanna Revanasiddappa
Keyword(s):  
Electrochemical Oxidation ◽  
Applied Voltage ◽  
Supporting Electrolyte ◽  
Aqueous Media ◽  
Degradation Process ◽  
Cell System ◽  
Electrolysis Cell ◽  
System A ◽  
Initial Ph ◽  
Indicator Dye

The present investigation showed that the indicator dye m-cresol purple (mCP) was degraded in a laboratory scale, undivided electrolysis cell system. A platinum anode was used for generation of chlorine in the dye solution. The influence of supporting electrolyte, applied voltage, pH, initial dye concentration and temperature were studied. The ultraviolet-visible spectra of samples during the electrochemical oxidation showed rapid decolorization of the dye solution. During the electrochemical degradation process, dye concentration and current were measured to evaluate the energy consumption and current efficiency. After 10 minutes of electrolysis, a solution containing 20 mg/L mCP showed complete color removal at a supporting electrolyte concentration of 1 g/L NaCl, initial pH 6.7, temperature 25 °C and applied voltage 5 V; however, when pH was kept at 6.7, a higher rate constant was observed. There was good fit of the data to pseudo-first-order kinetics for dye removal in all experiments. Dependence of the decolorization rate on the initial mCP concentration can be described as roα[mCP]o−0.98. The apparent activation energy for the electrochemical decolorization of mCP was determined to be −6.29 kJ/mol.

scholarly journals Vapour-induced solid-state C–H bond activation for the clean synthesis of an organopalladium biothiol sensor

2016 ◽  
Vol 52 (88) ◽  
pp. 12960-12963 ◽  
Author(s):  
Andrea Monas ◽  
Krunoslav Užarević ◽  
Ivan Halasz ◽  
Marina Juribašić Kulcsár ◽  
Manda Ćurić
Keyword(s):  
Methyl Orange ◽  
Solid State ◽  
Room Temperature ◽  
Bond Activation ◽  
Aqueous Media ◽  
Accelerated Aging ◽  
Water Soluble ◽  
Clean Synthesis

Room-temperature accelerated aging in the solid state has been applied for quantitative azobenzene C–H bond activation by Pd(OAc)2. Water-soluble dicyclopalladated methyl orange is a selective chromogenic biothiol sensor at physiologically-relevant micromolar concentrations in aqueous media.

Efficient removal of diuretic hydrochlorothiazide from water by electro-Fenton process using BDD anode: a kinetic and degradation pathway study

2019 ◽  
Vol 16 (8) ◽  
pp. 613 ◽  
Author(s):  
Hélène Monteil ◽  
Nihal Oturan ◽  
Yoan Péchaud ◽  
Mehmet A. Oturan
Keyword(s):  
Electrochemical Oxidation ◽  
Oxidation Reaction ◽  
Oxidation Process ◽  
Aqueous Media ◽  
Degradation Pathway ◽  
Constant Current ◽  
Gas Chromatography Mass Spectrometry ◽  
Aqueous Environment ◽  
Fenton Process ◽  
Kinetic Rate Constant

Environmental contextHydrochlorothiazide, a common diuretic pharmaceutical, occurs in environmental waters because current treatment technologies are unable to eliminate it from wastewater. To remove this environmentally hazardous chemical from water, we developed an advanced electrochemical oxidation process to efficiently degrade and mineralise the compound. Wider application of the process holds the promise of general, efficient destruction of pharmaceuticals in aqueous media. AbstractThe degradation and the mineralisation of the diuretic hydrochlorothiazide were studied by an advanced electrochemical oxidation process, ‘electro-Fenton’, which generates in situ hydroxyl radicals that are able to successfully oxidise or mineralise organic pollutants. In this study, a 0.1mM (29.8mgL−1) hydrochlorothiazide solution was completely oxidatively degraded in 15min under constant current electrolysis at 500 mA. The absolute kinetic rate constant of the oxidation reaction was also determined as (4.37±0.04)×109M−1s−1. The quasi-complete mineralisation of the solution was obtained with electrolysis for 6h under the same applied current. Several oxidation reaction intermediates were identified using gas chromatography-mass spectrometry (GC-MS). The formed carboxylic acids during the mineralisation process were also studied; oxamic, oxalic, acetic and maleic acids were identified and their concentrations were monitored throughout the electrolysis. The ions released during the treatment were also considered. Based on these data and the total organic carbon (TOC) removal results, a possible mineralisation pathway was proposed. These findings enable the conclusion that the electro-Fenton process is an efficient and environmentally-friendly method to eliminate the hazardous drug hydrochlorothiazide from an aqueous environment.

scholarly journals Rational Design of Amphiphilic Diblock Copolymer/MWCNT Surface Modifiers and Their Application for Direct Electrochemical Sensing of DNA

Polymers ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 1514
Author(s):  
Larisa V. Sigolaeva ◽  
Tatiana V. Bulko ◽  
Apollinariya Yu. Konyakhina ◽  
Alexey V. Kuzikov ◽  
Rami A. Masamrekh ◽  
...  
Keyword(s):  
Electrochemical Oxidation ◽  
Diblock Copolymer ◽  
Rational Design ◽  
Diblock Copolymers ◽  
Aqueous Media ◽  
Electrochemical Sensing ◽  
Multiwalled Carbon ◽  
Surface Areas ◽  
Copolymer Structure ◽  
Great Acceleration

We demonstrate the application of amphiphilic ionic poly(n-butylmethacrylate)-block- poly(2-(dimethylamino)ethyl methacrylate) diblock copolymers (PnBMA40-b-PDMAEMA40, PnBMA40-b-PDMAEMA120, PnBMA70-b-PDMAEMA120) for dispersing multiwalled carbon nanotubes (MWCNTs) in aqueous media, a subsequent efficient surface modification of screen-printed electrodes (SPEs), and the application of the modified SPEs for DNA electrochemistry. Stable and fine aqueous dispersions of MWCNTs were obtained with PnBMAx-b-PDMAEMAy diblock copolymers, regardless of the structure of the copolymer and the amount of MWCNTs in the dispersions. The effect of the diblock copolymer structure was important when the dispersions of MWCNTs were deposited as modifying layers on surfaces of SPEs, resulting in considerable increases of the electroactive surface areas and great acceleration of the electron transfer rate. The SPE/(PnBMAx-b-PDMAEMAy + MWCNT) constructs were further exploited for direct electrochemical oxidation of the guanine (G) and adenine (A) residues in a model salmon sperm double-stranded DNA (dsDNA). Two well-defined irreversible oxidation peaks were observed at about +600 and +900 mV, corresponding to the electrochemical oxidation of G and A residues, respectively. A multi-parametric optimization of dsDNA electrochemistry enables one to get the limits of detection (LOD) as low as 5 μg/mL (0.25 μM) and 1 μg/mL (0.05 μM) for G and A residues, respectively. The achieved sensitivity of DNA assay enables quantification of the A and G residues of dsDNA in the presence of human serum and DNA in isolated human leukocytes.

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