Electrooxidation of Chlorophenols Catalyzed by Nickel Octadecylphthalocyanine Adsorbed on Single‐Walled Carbon Nanotubes

Khene, Samson; Nyokong, Tebello

doi:10.1002/elan.201100155

Cited by 13 publications

(4 citation statements)

References 46 publications

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“…The other CPs behaved in a similar manner but with different peak potentials. According to the literature [9,[31][32][33][34], these peaks can be attributed to reaction 1: Next, the cathodic part of the voltammograms exhibited some reduction peaks of adsorbed quinones (or chloroquinones) and CPs. They are ascribable to the following possible reactions: quinone-hydroquinone redox couple (2) and CP reduction (3).…”

Section: Resultsmentioning

confidence: 73%

Electro-oxidation of chlorophenols on powdered carbon electrodes of different porosity

Biniak

Pakuła

Świątkowski

et al. 2014

Reac Kinet Mech Cat

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Activated carbons with large and medium-sized S BET , carbon blacks with different surface areas as well as graphite and heat-treated carbon of extremely low porosity were used in this study. Cyclic voltammograms were recorded for these materials in neutral electrolyte (0.1 M Na 2 SO 4 ) solutions containing various chlorophenols (CPs; 4-chlorophenol, 2,4-dichlorophenol, 2,4,6-trichlorophenol) as depolarizers. The changes in the FTIR spectra of the electrode materials caused by the adsorption and/or coupling of CPs (and/or their degradation products) were recorded. HPLC was used for analyzing the concentration of CPs and their degradation products. The dependence of the electrochemical behavior of CPs with various chlorine contents on the character of carbon materials is discussed. The possible mechanism of the initial stages of CP degradation by electro-oxidation/ reduction depends on the kind of electrode material. Since different carbons vary in their electrochemical behavior and in their voltammetric response to the presence of different CPs, the application of the method for selecting electrode materials better suited to removing organochlorine impurities from ground-water seems feasible. The efficiency of the process depends closely on the kind of carbon and on the tendency for its surface to become covered by a polymeric (conducting or nonconducting) film of electro-degradation products.

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Section: Resultsmentioning

confidence: 73%

Electro-oxidation of chlorophenols on powdered carbon electrodes of different porosity

Biniak

Pakuła

Świątkowski

et al. 2014

Reac Kinet Mech Cat

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“…Therefore, it is needful to establish a simple, fast and reliable analytical method for sensitive and selective determination of phenolic compounds in water. So far, different approaches have been described to meet the rising demands for monitoring phenols, such as fluorescence [8], liquid chromatography [9], mass spectroscopy [10] and electrochemical methods [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Studies on the electrochemical properties of nickel phtalocyanine for impedimetric detection of environment pollutants: hydroquinone and bisphenol A

Zahou

Mlika

BenChaabane

et al. 2015

IET Science, Measurement & Technology

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International audienceA self-assembled film of nickel phtalocyanine (NiPc) has been immobilised onto gold (Au) substrate to develop a new impedimetric method for environmental pollutants detection. NiPc/Au electrode was first characterised using contact angle measurements and cyclic voltammetry to investigate the adhesion and the kinetic behaviour of the self-assembled film. Results demonstrated the interaction between Au and benzene group and at the same time showed the formation of a completely covered NiPc layer on the Au surface. In addition, the NiPc film seems to exhibit reversible redox behaviour and is found to act as an electronic conductor which allows rapid electron transfer. The electrochemical impedance spectroscopy spectra of the NiPc/Au electrode, as a function of hydroquinone (HQ) and Bisphenol A (BPA) concentration, reveal that the value of the charge transfer resistance increases with increased concentration. The electrical behaviour of the structure was studied according to an equivalent circuit by fitting the experimental spectra. Moreover, this technique demonstrates that this membrane exhibits a high sensitivity towards the toxic pollutants HQ and BPA. The differences in selectivity are clearly displayed by variations in the membrane resistance (R-m) and in the charge transfer resistance (R-tc) of the interface

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“…In addition, different types of carbonaceous materials can be used to prepare the paste [22] that include, graphite, microspheres or carbon nanotubes among others [23][24][25]. Microspheres have the advantage of their high specific surface and porous structure, whereas carbon nanotubes (CNT) are excellent candidates for the fabrication of electrochemical sensors because of their electrical conductivity, large surface area, low surface fouling and ability to reduce overpotentials [26][27][28][29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical characterization of dilithium phthalocyanine carbonaceous electrodes

Apetrei

Medina-Plaza

Saja

et al. 2013

J. Porphyrins Phthalocyanines

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Carbonaceous electrodes of dilithium phthalocyanine were prepared using graphite, carbon microspheres and multiwall carbon nanotubes. The electrochemical behavior of the dilithium bisphthalocyanine electrodes was found to be dependent on the nature of the carbonaceous material and on the nature of the electrolytic solution. The electrocatalytic properties of the dilithium phthalocyanine electrodes for oxidation of ascorbic acid were evidenced by the enhancement of the oxidation peak current, (~10 fold compared to the bare carbon electrodes) and the decrease of the oxidation potential at which oxidation of ascorbic acid takes place. The combined use of multiwall carbon nanotubes and dilithium phthalocyanine produces a synergistic effect that improves the electrocatalytic effect towards ascorbic acid.

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Electrooxidation of Chlorophenols Catalyzed by Nickel Octadecylphthalocyanine Adsorbed on Single‐Walled Carbon Nanotubes

Cited by 13 publications

References 46 publications

Electro-oxidation of chlorophenols on powdered carbon electrodes of different porosity

Electro-oxidation of chlorophenols on powdered carbon electrodes of different porosity

Studies on the electrochemical properties of nickel phtalocyanine for impedimetric detection of environment pollutants: hydroquinone and bisphenol A

Electrochemical characterization of dilithium phthalocyanine carbonaceous electrodes

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