Cyclic voltammetry of aromatic amines in aqueous and non-aqueous media

Sharma, Lalit; Manchanda, A.K.; Singh, Gurcharan; Verma, R. D.

doi:10.1016/0013-4686(82)80007-8

Cited by 61 publications

(43 citation statements)

References 3 publications

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“…The first peak is due to the reduction of 4 to 2 and the second peak is due to the reduction of 3 to 1. Thus this mechanism accounts for a one-step two-electron oxidation of aniline in aquoacetic acid medium [25].…”

Section: Resultsmentioning

confidence: 99%

Substituent and Solvent Effects on the Electrochemical Oxidation of para- and meta-Substituted Anilines

Bhuvaneshwari

Elango

2006

Zeitschrift Für Naturforschung B

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Electrochemical oxidation of fifteen para-and meta-substituted anilines in different mole fractions of acetic acid in water has been investigated in the presence of 0.1 M sulphuric acid as supporting electrolyte. The oxidation potential data of anilines correlates well with Hammett's and BrownOkamoto's substituent constants affording negative reaction constants. The effect of para-and metasubstituents on the oxidation potential conforms to Swain's F and R parameters, affording negative reaction constants. The oxidation potential values correlate well with macroscopic solvent parameters such as relative permittivity, ε r , and polarity, E T N . Multiple correlation analysis also shows an excellent correlation with the oxidation potential values.

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Section: Resultsmentioning

confidence: 99%

Substituent and Solvent Effects on the Electrochemical Oxidation of para- and meta-Substituted Anilines

Bhuvaneshwari

Elango

2006

Zeitschrift Für Naturforschung B

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“…For the VC-OH matrix, we observed two redox pairs of broad peaks at 0.33/0.44 V (a/a′) and smaller at 0.60/0.68 V (b/b′). They have been previously assigned to a faradaic contribution from oxygen-based functional groups [58], and the following redox reaction has been proposed [59,60] [62], and a specific redox couple (−0.041 V/0.189 V) related with p-aminodiphenylamine (ADPA) [63]. If we consider the possibility of secondary amines present in the VC-NH 2 matrix, as suggested by the ATR spectrum, the redox couple c/c′ could correlate to the presence of aniline dimers (DPA and ADPA) in addition to the aniline grafted to the VC matrix, as shown in Scheme 1.…”

Section: Electrochemical Characterizationmentioning

confidence: 99%

“…We must note that the POMs are being incorporated, but the effect on the current density Scheme 1 Schematic representation of aniline dimer redox pairs, possibly involved in the carbon matrix modified with -NH 2 groups (VC-NH 2 ). Adapted from the work of Santos et al [62] and Sharma et al [63] again suggests that POM incorporation in ethanol does not yield optimal materials.…”

Section: Electrochemical Characterizationmentioning

confidence: 99%

Electrochemical study of H3PMo12 retention on Vulcan carbon grafted with NH2 and OH groups

Cuentas-Gallegos

López-Cortina

Brousse

et al. 2015

J Solid State Electrochem

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In this work, we show a comparative study based on the effects of specific chemical functional groups (-OH, -NH 2 ), grafted on Vulcan carbon (VC) with the incorporation of a specific polyoxometalate (POM), PMo 12 (H 3 PMo 12 O 40 ), to improve electrochemical performance. We observed a decrease in the specific surface area of the grafted matrices (VC-OH and VC-NH 2 ) [1], and the same trend was observed for PMo 12 (POM) incorporation. Our electrochemical studies showed low concentrations of POM in unmodified VCs and higher POM concentrations for grafted matrices (VC-OH and VC-NH 2 ) after 500 voltammetric cycles, especially for the VC grafted with -OH groups (VC-OH-POM). Mechanisms have been proposed for POM interaction with the grafted groups in carbon, emphasizing the role of aqueous medium and redox activity of POM. Cyclic voltammograms suggested the POM anchoring through -OH groups with a strong interaction as a covalent bond, resulting in a surface coverage of 1.66 × 10 −11 mol cm −2. Surface modifications could be extrapolated to other carbons, and the materials could be employed for different potential applications such as photocatalysis, amperometric sensors, fuel cells, and supercapacitors.

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“…But radical coupling was not noticed in the ortho-position of the ring (Sharma et al, 1982). substrate (Laha and Luthy, 1990;Hambitzer and Stassen, 1993).…”

Section: Optimum Coagulant Concentrationmentioning

confidence: 99%

Laccase‐Catalyzed Removal of Diphenylamine from Synthetic Wastewater

Saha

Taylor

Bewtra

et al. 2008

Water Environment Research

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The priority pollutant lists of both the U.S. Environmental Protection Agency (U.S. EPA) and the European Union (EU) include diphenylamine (DPA), a contaminant found in wastewater of various industries. This work demonstrates the potential of using enzymatic treatment to remove DPA from buffered synthetic wastewater. This treatment method includes oxidative polymerization of DPA using laccase from Trametes villosa, followed by removal of those polymers via adsorptive micellar flocculation (AMF) using sodium lauryl sulfate (SDS) and alum. Researchers investigated the effects of pH, laccase concentration, molecular mass, and concentration of polyethylene glycol (PEG) in continuously stirred batch reactors to achieve 95% substrate conversion in three hours. Treatment of 0.19 mM DPA was best at pH 7 and an enzyme concentration from 0.0025 to 0.0075 standard activity unit/mL. Except for PEG 400, optimum enzyme and PEG concentrations decreased with an increase in PEG molecular mass. Optimum AMF conditions were pH 3.0 to 6.5, 200 mg/L of SDS, and 150 mg/L of alum.

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Cyclic voltammetry of aromatic amines in aqueous and non-aqueous media

Cited by 61 publications

References 3 publications

Substituent and Solvent Effects on the Electrochemical Oxidation of para- and meta-Substituted Anilines

Substituent and Solvent Effects on the Electrochemical Oxidation of para- and meta-Substituted Anilines

Electrochemical study of H3PMo12 retention on Vulcan carbon grafted with NH2 and OH groups

Laccase‐Catalyzed Removal of Diphenylamine from Synthetic Wastewater

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