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Polcaro, Am; Vacca, Annalisa; Palmas, Simonetta; Mascia, Michele

doi:10.1023/a:1025815828503

Cited by 107 publications

(50 citation statements)

References 14 publications

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“…37 Thus, it has been shown that the incineration of some organics at BDD proceeds through the formation of some intermediates. As an example, the oxidation of phenol can be represented by the following schematic reaction path:…”

Section: Kinetic Model Of Organics Mineralization On Bdd Anodesmentioning

confidence: 99%

“…As an example, Polcaro et al 37 used their model to predict with a good accuracy, for the oxidation of phenol, the trend with time of the concentrations of phenol and main intermediates (aromatic and aliphatic acids) by changing significantly the current density and the flow dynamic regime and using only one adjustable parameter (the average kinetic constant between hydroxyl radicals and aromatic compounds). A good agreement between theoretical predictions and experimental data was also reported by these authors in the cases of cyanuric acid and atrazine by using this model as an adjustable parameter to the kinetic constant between hydroxyl radicals and the adopted pollutant.…”

Section: Kinetic Model Of Organics Mineralization On Bdd Anodesmentioning

confidence: 99%

“…In a first version of the model, a i electrode were a function of the oxidizability factors of the compounds in the electrochemical system, which were computed as adjustable parameters. 37 Later authors assumed that the fraction of i app used in each process depends on the cell potential (DV work ) and the oxidation (or reduction) potential (DV i ) of each process by the relationship reported below, so that no adjustable parameters were used in the model. …”

Section: Kinetic Model Of Organics Mineralization On Bdd Anodesmentioning

confidence: 99%

See 2 more Smart Citations

Electrocatalysis in wastewater treatment: recent mechanism advances

Martínez‐Huitle¹,

Andrade²

2011

Quím. Nova

112

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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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Section: Kinetic Model Of Organics Mineralization On Bdd Anodesmentioning

confidence: 99%

Section: Kinetic Model Of Organics Mineralization On Bdd Anodesmentioning

confidence: 99%

Section: Kinetic Model Of Organics Mineralization On Bdd Anodesmentioning

confidence: 99%

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Electrocatalysis in wastewater treatment: recent mechanism advances

Martínez‐Huitle¹,

Andrade²

2011

Quím. Nova

112

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“…In recent years, electrochemical oxidation with conductive-diamond anodes has become one of the most promising technologies in the treatment of industrial wastes polluted with organics [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] and in the electrosynthesis of inorganic oxidants [13,[33][34][35]. Compared with other electrode materials, conductive-diamond has shown higher chemical and electrochemical stability as well as a higher current efficiency.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical synthesis of peroxomonophosphate using boron-doped diamond anodes

et al. 2007

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in: http://oatao.univ-toulouse.fr/ Eprints ID : 3043 Abstract A new method for the synthesis of peroxomonophosphate, based on the use of boron-doped diamond electrodes, is described. The amount of oxidant electrogenerated depends on the characteristics of the supporting media (pH and solute concentration) and on the operating conditions (temperature and current density). Results show that the pH, between values of 1 and 5, does not influence either the electrosynthesis of peroxomonophosphate or the chemical stability of the oxidant generated. Conversely, low temperatures are required during the electrosynthesis process to minimize the thermal decomposition of peroxomonophosphate and to guarantee significant oxidant concentration. In addition, a marked influence of both the current density and the initial substrate is observed. This observation can be explained in terms of the contribution of hydroxyl radicals in the oxidation mechanisms that occur on diamond surfaces. In the assays carried out below the water oxidation potential, the generation of hydroxyl radicals did not take place. In these cases, peroxomonophosphate generation occurs through a direct electron transfer and, therefore, at these low current densities lower concentrations are obtained. On the other hand, at higher potentials both direct and hydroxyl radical-mediated mechanisms contribute to the oxidant generation and the process is more efficient. In the same way, the contribution of hydroxyl radicals may also help to explain the significant influence of the substrate concentration. Thus, the coexistence of both phosphate and hydroxyl radicals is required to ensure the generation of significant amounts of peroxomonophosphoric acid.

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“…As vantagens destes eletrodos incluem alta resistência à corrosão e dureza, grande faixa de potencial de trabalho (-3 a +3 V) para a maioria dos solventes e eletrólitos, alta inércia química e eletroquímica, baixa corrente de fundo, atividade eletroquímica reprodutível sem pré-tratamento e alta condutividade elétrica e térmica 33,34 . Sendo assim, os filmes de diamante podem ser usados em eletrossíntese [35][36][37][38][39][40][41] , no tratamento de efluentes [42][43][44][45][46][47][48] , em eletroanálise 49-51 e em colunas de detecção [52][53][54] . Alguns experimentos eletroquímicos conduzidos por Swain et al 55 permitiram verificar que a microestrutura superficial dos filmes de diamante não sofre corrosão em meio de fluoretos ácidos, enquanto que as microestruturas de eletrodos de grafite e carbono vítreo são severamente danificadas.…”

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Filmes de nanodiamantes para aplicações em sistemas eletroquímicos e tecnologia aeroespacial

Azevedo¹,

Ferreira²

2006

Quím. Nova

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Recebido em 13/10/04; aceito em 20/5/05; publicado na web em 25/11/05 NANODIAMOND FILMS FOR APPLICATIONS IN ELECTROCHEMICAL SYSTEMS AND AERONAUTICS AND SPACE TECHNOLOGY. The goal of this work is to show the use of undoped nanodiamond films as a new material for electrochemical and aerospace applications. Correlation between the applications and physico-chemical features of nano and conventional CVD polycrystalline diamond films are presented. An important and innovative application of these nanodiamonds is organic electrosynthesis, including pharmaceutical and water disinfection products, as well as electroanalytical applications, for example, development of biosensors for detection of glucose, glutamate and dopamine. In aeronautics and space developments, these nanodiamonds could be used as electrodes in rechargable batteries and in tribological investigations.Keywords: nanodiamond; electrochemical; aerospace. [9][10][11] . Quanto aos materiais utilizados como substrato para deposição dos filmes de diamante e seu uso em aplicações eletroquímicas pode-se destacar o silício, o titânio e suas ligas. Embora com as desvantagens da baixa resistência mecânica, baixa condutividade elétrica e alto custo, o silício tem a vantagem de ser um material semicondutor e possuir coeficiente de dilatação próximo ao do diamante, o que o torna um dos substratos mais utilizados [12][13][14][15][16][17][18][19] . Por outro lado, um substrato que começou a ser visto com interesse pelos pesquisadores para este tipo de aplicação é o titânio [20][21][22] e suas ligas 23 . Isto porque estes materiais são economicamente viáveis, têm baixa massa específica, são dúcteis e possuem excelente resistência à corrosão em ambientes agressivos, devido à formação espontânea de uma camada passivadora superficial de óxido. Além do titânio e suas ligas, o carbono vítreo também vem sendo recentemente utilizado como substrato nas aplicações eletroquímicas de eletrodos de filmes de diamante 24,25 . O carbono vítreo, material relativamente novo e desenvolvido em torno de 1960, possui algumas propriedades notáveis, como força elevada, alta resistência ao ataque de substâncias químicas, boa condutividade elétrica e permeabilidade extremamente baixa ao hélio 26,27 . A resposta eletroquímica dos eletrodos de diamante depende do nível de dopagem 28,29 . O diamante em seu estado natural é considerado um semicondutor de banda larga (E g = 5,5 eV) e oferece vantagens para aplicações eletrônicas em condições ambientais extremas, tais como alta temperatura, voltagem e radiação 30 . Os filmes de diamante possuem propriedades eletrônicas que vão desde isolante em baixas dopagens, para semicondutor ou até comportamento semimetálico, em altos níveis de dopagem INTRODUÇÃO 31. A dopagem consiste na incorporação de átomos na rede cristalina do diamante e estes podem atuar como receptores (dopagem tipo-p) ou doadores (dopagem tipo-n) de elétrons. A dopagem tipo-p no diamante é relativamente mais fácil de obter e com uma eficiência maior que a dopagem tipo-n 32 , por ex., de...

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Untitled

Cited by 107 publications

References 14 publications

Electrocatalysis in wastewater treatment: recent mechanism advances

Electrocatalysis in wastewater treatment: recent mechanism advances

Electrochemical synthesis of peroxomonophosphate using boron-doped diamond anodes

Filmes de nanodiamantes para aplicações em sistemas eletroquímicos e tecnologia aeroespacial

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