Electrochemical oxidation of organics in water: Role of operative parameters in the absence and in the presence of NaCl

Scialdone, Onofrio; Randazzo, Serena; Galia, Alessandro; Silvestri, Guido

doi:10.1016/j.watres.2009.02.014

Cited by 274 publications

(189 citation statements)

References 28 publications

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“…According to literature, such behavior can be attributed to the oxidation of Cl ions to Cl2 [23]. The same cyclic voltammetry behavior was obtained by Scialdone et al [24], when OA, at a concentration of 5 mM, was incinerated on an IrO2-Ta2O5 anode; however, the anodic wave in the present work was higher, due to the used OA higher concentration.…”

Section: Anode Cyclic Voltammograms Performancesupporting

confidence: 89%

“…OA removal efficiency increased from 88 to 94 %, as NaCl concentration increased from 1 to 5 g/L (Table 1). However, using a NaCl concentration higher than 3 g/L is not recommended, because the halogenated organic compound can generate more toxic materials than those of OA [24]. The rate constant against the current density is shown in Fig.…”

Section: Indirect Electrochemical Oxidation Kineticsmentioning

confidence: 99%

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A Kinetic Study of Oxalic Acid Electrochemical Oxidation on a Manganese Dioxide Rotating Cylinder Anode

Abbar¹,

Abbas²

2018

Port. Electrochim. Acta

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This paper deals with the theory and kinetics of oxalic acid electrochemical oxidation, in an acidic solution containing sodium chloride, using a manganese dioxide rotating cylinder anode. Voltammetric and galvanostatic electrolysis techniques were used. The voltametric study shows a higher anodic wave corresponding to chlorine oxidation on the MnO2 electrode, prevailing oxalic acid indirect oxidation. Galvanostatic electrolysis studies confirmed that the rate constant is affected by chloride concentration, current density, agitation and temperature. Electrochemical oxidation rate was found to be a pseudo-first order kinetic process. A strongly linear relationship between the rate constant and chloride concentration was observed, while polynomial relations, with respect to current density and temperature, were found. The activation energy was found to be 14.541 kJ/mol, which suggests a diffusion control kinetic step in oxalic acid degradation. The findings of the present research validate that oxalic acid incineration can be successfully carried out on a MnO2 anode, in NaCl presence.

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Section: Anode Cyclic Voltammograms Performancesupporting

confidence: 89%

Section: Indirect Electrochemical Oxidation Kineticsmentioning

confidence: 99%

A Kinetic Study of Oxalic Acid Electrochemical Oxidation on a Manganese Dioxide Rotating Cylinder Anode

Abbar¹,

Abbas²

2018

Port. Electrochim. Acta

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“…39 In the case of phenol, as an example, the model considered the direct oxidation of phenol at the anode to carbon dioxide, via the formation of maleic and oxalic acids as intermediates, and the hydrogen evolution at the cathode and the predicted profile concentrations of phenol, maleic and formic acids with the charge passed were in a good agreement with experimental data obtained under a very large range of operative conditions. Finally, other model have recently published where the effect of operative parameters on the performances of the process was recently investigated by Scialdone et al, [41][42][43][44] by considering, for the sake of simplicity, the complete oxidation of an organic pollutant that proceed in competition with the oxygen evolution with no formation of intermediates with significant concentrations in the bulk. In this case, the instantaneous current efficiency for a process under galvanostatic mode can be rapidly estimated for both mass transfer and oxidation reaction control regimes.…”

Section: Kinetic Model Of Organics Mineralization On Bdd Anodesmentioning

confidence: 99%

Electrocatalysis in wastewater treatment: recent mechanism advances

Martínez‐Huitle¹,

Andrade²

2011

Quím. Nova

110

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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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“…Um composto de elevado poder oxidante (radical hidroxila, hipoclorito, entre outros), gerado pelo processo ou presente no meio, atua como auxiliar às reações de oxidação promovidas pelo anodo acelerando as reações de oxidação do meio aumentando assim a eficiência do tratamento eletroquímico [12,33,37,39,[47][48][49][50][51][52]. É importante ressaltar que o efeito da oxidação indireta também dependerá do material selecionado para o anodo [52]. Além disso, poderá contribuir para a diminuição do valor de pH do meio ou ainda ser responsável por processos corrosivos significativos que comprometeriam o desempenho dos eletrodos no sistema eletroquímico [8,39,47,51,53].…”

Section: Introductionunclassified

Tratamento eletroquímico de efluentes industriais - alternativa para a remoção de contaminantes e potencial aproveitamento de H 2

Maia¹,

Jambo

Gomes³

2018

Matéria (Rio J.)

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RESUMOA utilização de tratamentos eletroquímicos como recurso tecnológico alternativo para o tratamento de efluentes industriais tem atraído considerável atenção, apresentando características vantajosas como facilidade de automação, alta eficiência e versatilidade em menor tempo de tratamento, além de requerer menor espaço físico para suas instalações. A diminuição do uso de produtos químicos para o tratamento, uma vez que o elétron é o principal reagente no processo, e a possibilidade de reaproveitamento de coprodutos gerados também se configuram em importantes oportunidades dentro do atual cenário global de sustentabilidade e energia. Essas tecnologias comportam ainda o uso de fontes renováveis de energia. Um coproduto catódico de grande interesse ambiental e econômico é o hidrogênio, potencialmente coletado e armazenado.Nesse contexto, os materiais são de importância fundamental, pois a eficiência e sustentabilidade dos processos eletroquímicos dependem da utilização de materiais com propriedades como baixa impedância eletroquímica e elevada resistência à corrosão, além de elevada atividade para a oxidação dos compostos de interesse, em especial os materiais selecionados para as etapas anódicas.O objetivo deste artigo é apresentar, em linhas gerais, um dos trabalhos desenvolvidos no Labcorr voltados para o tratamento eletroquímico de efluentes industriais visando a remoção de N-NH 3 e DQO. Técnicas eletroquímicas foram utilizadas para a seleção dos materiais usados como anodos e catodos. Configurações para utilização de NaOCl como oxidante indireto no processo foram avaliadas. Os resultados mostraram que um reator de placas paralelas com anodos DSA e catodos de aço carbono e injeções de NaOCl ao início do tratamento e em ponto intermediário do processo foram efetivos na remoção dos compostos desejados, indicando ainda boa oportunidade para o reaproveitamento de produtos como nitrito e hidrogênio, o primeiro como inibidor de corrosão e o segundo podendo ser utilizado como fonte de energia para alimentar o próprio sistema de tratamento de forma semiautônoma.Palavras-chave: tratamento eletroquímico, eletrodos DSA, aço carbono, hidrogênio. ABSTRACTThe electrochemical treatment as an alternative technological resource for the treatment of industrial effluents has attracted considerable attention through the last years because of important characteristics such as easy automation, high efficiency and versatility in a short period of time besides requiring less physical space for its units. As the electron is the main "reagent" in an electrochemical process, the use of chemicals is reduced. This and the possibility of using coproducts generated during the electrochemical treatment processes configure relevant opportunities in the actual global energy and sustainability scenario. These technologies may include the use of renewable energy sources such as Hydrogen, a cathodic coproduct of great ambiental and economical interest that could be obtained and stored.

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Electrochemical oxidation of organics in water: Role of operative parameters in the absence and in the presence of NaCl

Cited by 274 publications

References 28 publications

A Kinetic Study of Oxalic Acid Electrochemical Oxidation on a Manganese Dioxide Rotating Cylinder Anode

A Kinetic Study of Oxalic Acid Electrochemical Oxidation on a Manganese Dioxide Rotating Cylinder Anode

Electrocatalysis in wastewater treatment: recent mechanism advances

Tratamento eletroquímico de efluentes industriais - alternativa para a remoção de contaminantes e potencial aproveitamento de H 2

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