Degradation of phenol using Co- and Co,F-doped PbO2 anodes in electrochemical filter-press cells

Andrade, Leonardo S.; Rocha‐Filho, Romeu C.; Bocchi, Nerilso; Biaggio, Sonia R.; Iniesta, Jesús; García-García, Vicente; Montiel, Vicente

doi:10.1016/j.jhazmat.2007.08.046

Cited by 119 publications

(56 citation statements)

References 43 publications

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“…111 In view of the high rates of oxidation of organics at some doped coatings, it is not surprising that the studies have been extended to the complete oxidation of organics and hence for the removal of TOC/COD from effluent mimics. [115][116][117][118] Johnson and coworkers 109,111,112,[114][115][116]119,120,124,127 have made detailed studies of the mechanisms for the enhancement of rates by doping. They regard oxidations at lead dioxide anodes as oxygen transfer reactions rather than electron transfer reactions and therefore stress the importance of the activation of water as adsorbed OH radicals as the key step in the oxidations.…”

Section: Doped Lead Dioxidementioning

confidence: 99%

Electrodeposited lead dioxide coatings

2011

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Lead dioxide coatings on inert substrates such as titanium and carbon now offer new opportunities for a material known for 150 years. It is now recognised that electrodeposition allows the preparation of stable coatings with different phase structures and a wide range of surface morphologies. In addition, substantial modification to the physical properties and catalytic activities of the coatings are possible through doping and the fabrication of nanostructured deposits or composites. In addition to applications as a cheap anode material in electrochemical technology, lead dioxide coatings provide unique possibilities for probing the dependence of catalytic activity on layer composition and structure (critical review, 256 references).

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Section: Doped Lead Dioxidementioning

confidence: 99%

Electrodeposited lead dioxide coatings

2011

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“…These findings lend further evidence to the importance of the nature of the electrode material and represent a new approach to the electrochemical oxidation mechanism. [45][46][47][48] For this reason, these recent results open new avenues in the study of the EO mechanisms, so as to optimize such processes. Future developments will rely upon the close collaboration of electrochemists, engineers, and chemists to ensure the effective application and exploitation of EO techniques to control important water pollutants using the advances in electrocatalysis.…”

Section: Mineralization Of Organics By Molecular Oxygenmentioning

confidence: 99%

Electrocatalysis in wastewater treatment: recent mechanism advances

Martínez‐Huitle¹,

Andrade²

2011

Quím. Nova

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105

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Recebido em 23/9/10; aceito em 4/12/10; publicado na web em 25/3/11Over 50 years, several scientists and industries have developed new alternatives for wastewater treatment and remediation. Recently, electrochemical technology has been largely developed mainly because of its versatility and environmental compatibility. Scientific contributions about role of the electrode material have allowed determining that the influence of material in the selectivity is an important parameter. However, to interpret this behavior, comprehensive physical chemistry models for organics destruction, related to electrochemical phenomena and material surfaces, were proposed in the last decades. So, this paper presents a critical and comprehensive review about the principles and recent mechanism advances in electrocatalysis for wastewater treatment.

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“…The energy consumption (EC) for the removal of 10 3 g of COD was determined through equation 2: 14,29 (2) where, t is the electrolysis time (h), U is the cell applied potential (V), I is the current (A), V the solution volume (L) and DCOD the COD difference (mg L -1 ).…”

Section: M(ohmentioning

confidence: 99%

Electrooxidation of Phenol on a Ti/RuO2 anode: effect of some electrolysis parameters

Santos¹,

Afonso²,

Dutra³

2011

J. Braz. Chem. Soc.

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Foram investigadas as influências do tempo de eletrólise, da área anódica, da densidade de corrente e do tipo de eletrólito na degradação de fenol e de seus subprodutos de oxidação em anodo de Ti/RuO 2 . Foi observado que na presença de cloreto ocorreu rápida degradação de fenol e de seus subprodutos. Resultados de cromatografia gasosa/espectroscopia de massa (GC/MS) mostraram que a presença de cloreto levou à formação inicial de clorofenóis através do Cl 2 e/ou OCl¯ gerados durante a eletrólise. Entretanto, eles posteriormente atuaram na degradação dos clorofenóis. As concentrações limites estabelecidas pelo Órgão Ambiental Brasileiro (CONAMA) para descartes de fenol e clorofenóis foram obtidas após 360 min de eletrólise a uma densidade de corrente fixa de 10 mA cm -2 . Voltamogramas cíclicos obtidos antes e após 436 h de eletrólise em condições severas de salinidade (2 mol L -1 ) e densidade de corrente (800 mA cm -2 ) mostraram que o eletrodo de Ti/RuO 2 não perdeu suas propriedades eletrocatalíticas.The influences of electrolysis time, anodic area, current density and supporting electrolyte on phenol and its byproducts degradation on a Ti/RuO 2 anode were investigated. It was observed that phenol and its byproducts were rapidly broken down in the presence of chloride ions. Gas chromatography/mass spectrometry (GC/MS) data have shown that the presence of chloride ions lead to chlorophenols formation, due to reactions with Cl 2 and/or OCl¯ generated during electrolysis. However, these intermediate products were also degraded later by the oxidizing agents. The standards established by the CONAMA (Brazilian National Council for the Environment) for phenols and chlorophenols in effluents were achieved after 360 min of electrolysis with a current density of 10 mA cm -2 . Cyclic voltammograms obtained with the anodes before and after 436 h of electrolysis under severe salinity conditions (2 mol L -1 ) and current density (800 mA cm -2 ) showed that Ti/RuO 2 did not lose its electrocatalytic properties. This fact indicates that Ti/RuO 2 can be used for the treatment of effluents containing phenols in a chloride environment. Keywords: electrooxidation, phenols, chlorophenols, supporting electrolyte IntroductionPhenols are persistent organic compounds found in aqueous effluents from domestic activities such as cooking, washing and bathing, as well as petroleum refineries, steel plants, dyeing manufacturing, pharmaceutical and plastic industries. [1][2][3][4] They are refractory to conventional treatment process and, in the presence of chlorine, they may produce chlorophenols, which are carcinogenic and even more refractory to degradation than the phenols themselves. [4][5][6] There are several available processes to treat effluents containing phenols, such as biological treatment, advanced oxidation processes, oxidation in supercritical water and electrochemical oxidation. 6-8 Furthermore, some of those processes, for instance photocatalytic oxidation process, presents high operational costs and operational issues due...

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Degradation of phenol using Co- and Co,F-doped PbO2 anodes in electrochemical filter-press cells

Cited by 119 publications

References 43 publications

Electrodeposited lead dioxide coatings

Electrodeposited lead dioxide coatings

Electrocatalysis in wastewater treatment: recent mechanism advances

Electrooxidation of Phenol on a Ti/RuO2 anode: effect of some electrolysis parameters

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