Electrooxidation of chlorophenols at a glassy carbon electrode in a pH 11 buffer

Berríos, Cristhian; Arce, Roxana; Rezende, Marcos Caroli; Ureta-Zañartu, María Soledad; Gutiérrez, C.

doi:10.1016/j.electacta.2007.10.053

Cited by 43 publications

(32 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The redox mediator activity in alkaline media of electrodes modified with Ni(II) compounds is due to the quasi reversible properties of the Ni(III)/Ni(II) process [9,10,11],which may be represented as follows [12]:…”

Section: -Introductionmentioning

confidence: 99%

“…Also Alatorre et al [8] found that GC electrodes modified with electropolymerized nickel complexes showed less fouling in the oxidation of 4-CP and 4-nitrophenol in 1 M NaOH. Our laboratory has some experience in this field [4,5,9,10,11]. The goal is to decrease the oligomerization rate and to promote full oxidation of the phenolic compound.…”

Section: -Introductionmentioning

confidence: 99%

“…Our laboratory has some experience in this field [4,5,9,10,11]. The goal is to decrease the oligomerization rate and to promote full oxidation of the phenolic compound.The redox mediator activity in alkaline media of electrodes modified with Ni(II) compounds is due to the quasi reversible properties of the Ni(III)/Ni(II) process [9,10,11],which may be represented as follows [12]:Actually nickel hydroxide can have more than one stable structure [13,14,15]. Van der Ven et al [16] reported the formation of two types of nickel hydroxide, α -and β-Ni(OH) 2 , and two kinds of nickel oxyhydroxides, α -and γ-NiOOH, which, due to their different structures and degrees of hydration, have different electrochemical properties.…”

mentioning

confidence: 99%

See 2 more Smart Citations

ELECTROOXIDATION OF 2,4,6-TRICHLOROPHENOL ON GLASSY CARBON ELECTRODES MODIFIED WITH COMPOSITE Ni(OH)2-Co(OH)2 FILMS

González¹,

Salazar²,

Marco³

et al. 2013

J. Chil. Chem. Soc.

View full text Add to dashboard Cite

Glassy carbon electrodes coated with a film of electrodeposited cobalt and nickel hydroxides were prepared in order to determine its activity to the 2,4,6-trichlorophenol (TCP) oxidation. The modified electrodes were characterized by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), X-ray photoelectron spectroscopy and Scan Electron Microscopy (SEM) with Energy Dispersive X-ray Spectroscopy (EDS). The results indicate that both hydroxides are homogeneously distributed in the electrode surface. From the viewpoint of electrochemical oxidation of TCP, the presence of cobalt and nickel hydroxides on the electrode surface (i) promotes a more complete oxidation of TCP and (ii) decreases the fouling of the electrode surface in comparison with GC and GC modified with Ni or Co separately. Keywords:Modified electrodes, (Ni-Co) hydroxides, chlorophenol oxidation e-mail: soledad.ureta@usach.cl 1.-INTRODUCTIONWaste from domestic, agricultural and industrial activities such as cellulose treatment and the manufacturing of plastics, adhesives and petrochemicals may pollute watercourses [1]. The widely used halogenated compounds are not amenable to biological degradation, and can accumulate in living organisms, this being the reason why they are used as wood preservatives, antibacterial agents, fungicides, insecticides and herbicides [2,3].Au and Pt show high catalytic activity for the electrooxidation of chlorophenols (CP) over short times, but they are quickly fouled up by small oligomers, generated by the coupling of two phenoxy radicals or by reaction of a radical with unreacted CP molecules [4,5]. Electrodes modified with redox mediators could increase the activity and specificity for a given reaction and avoid fouling [6]. So, glassy carbon (GC) electrodes modified with Co(II) phthalocyanine (CoPc) show higher currents and less fouling in the oxidation of 2-chlorophenol (2-CP) and 4-chlorophenol (4-CP) in 1 M NaOH [7]. Also Alatorre et al. [8] found that GC electrodes modified with electropolymerized nickel complexes showed less fouling in the oxidation of 4-CP and 4-nitrophenol in 1 M NaOH. Our laboratory has some experience in this field [4,5,9,10,11]. The goal is to decrease the oligomerization rate and to promote full oxidation of the phenolic compound.The redox mediator activity in alkaline media of electrodes modified with Ni(II) compounds is due to the quasi reversible properties of the Ni(III)/Ni(II) process [9,10,11],which may be represented as follows [12]:Actually nickel hydroxide can have more than one stable structure [13,14,15]. Van der Ven et al. [16] reported the formation of two types of nickel hydroxide, α -and β-Ni(OH) 2 , and two kinds of nickel oxyhydroxides, α -and γ-NiOOH, which, due to their different structures and degrees of hydration, have different electrochemical properties.Other hydroxide, Co(OH) 2 , has been widely used as an additive to Ni(OH) 2 in order to improve alkaline secondary batteries [17,18,19], these improvements being attributed to an increase of bot...

show abstract

Section: -Introductionmentioning

confidence: 99%

Section: -Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

ELECTROOXIDATION OF 2,4,6-TRICHLOROPHENOL ON GLASSY CARBON ELECTRODES MODIFIED WITH COMPOSITE Ni(OH)2-Co(OH)2 FILMS

González¹,

Salazar²,

Marco³

et al. 2013

J. Chil. Chem. Soc.

View full text Add to dashboard Cite

show abstract

“…Along with biodegradation and photodegradation processes [1], many electrochemical studies have been reported in recent years [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. A wide variety of electrode materials, such as carbon black, CB [2], glassy carbon [3,6,9], glassy carbon modified with aluminosilicates [4], graphite [5,7,8], Au [10,15], diamond [16], boron-doped diamond [11,13] and Pt [12,14] have been used for the electro-oxidative removal of CPs. In addition, the electro-polymerization behavior of CPs during voltammetric measurements (electrode fouling) has been reported, as has the fact that the tars formed display a low rate of oxidation, low permeability and strong adhesion to the electrode [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

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

Biniak

Pakuła

Świątkowski

et al. 2014

Reac Kinet Mech Cat

View full text Add to dashboard Cite

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.

show abstract

“…The phenol derivates are toxic and non-biodegradable organic compounds included in the list of priority phenols, which are used/produced in several industrial processes, being commonly used as preservatives, disinfectants, in pulp processing, in the manufacture of pesticides and intermediars [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

The degradation of phenol derivates from wastewaters by electrochemical treatment

Bebeselea¹,

Manea²,

Radovan³

et al. 2008

WIT Transactions on Ecology and the Environment

View full text Add to dashboard Cite

A group of carbon-based electrodes, i.e., glassy-carbon (GC), boron doped diamond (BDD), expanded graphite-polystyrene composite (EG-PS), expanded graphite-epoxy composite (EG-Epoxy) and expanded graphite-carbon nanofiberepoxy composite (EG-CNF-Epoxy) electrodes were investigated for electrochemical degradation of 4-chlorophenol (4-CP). Based on the investigated electrochemical techniques, e.g., cyclic voltammetry (CV) and chronoamperometry (CA), the operation conditions and the electrode suitable for electrochemical oxidation of 4-CP were selected. In addition, multiple pulsed amperometry (MPA) was applied for the in-situ electrochemical cleaning of the electrode surface to improve the electrode efficiency. The BDD electrode exhibited the best features related to the 4-CP electrochemical degradation efficiency.

show abstract

Electrooxidation of chlorophenols at a glassy carbon electrode in a pH 11 buffer

Cited by 43 publications

References 19 publications

ELECTROOXIDATION OF 2,4,6-TRICHLOROPHENOL ON GLASSY CARBON ELECTRODES MODIFIED WITH COMPOSITE Ni(OH)2-Co(OH)2 FILMS

ELECTROOXIDATION OF 2,4,6-TRICHLOROPHENOL ON GLASSY CARBON ELECTRODES MODIFIED WITH COMPOSITE Ni(OH)2-Co(OH)2 FILMS

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

The degradation of phenol derivates from wastewaters by electrochemical treatment

Contact Info

Product

Resources

About