Electrochemical preparation of peroxodisulfuric acid using boron doped diamond thin film electrodes

Serrano, Karine Groenen; Michaud, Pierre; Comninellis, Christos; Savall, A.

doi:10.1016/s0013-4686(02)00688-6

Cited by 302 publications

(214 citation statements)

References 22 publications

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“…This plateau value results from a balance between the rate of formation of oxidant and its decomposition rate. The same phenomenon was observed during the electrosynthesis of peroxodisulphates [33] and possibly peroxodiphosphate [13]. Thus, to study the chemical decomposition of the peroxomonophosphoric acids generated as a function of the temperature and also pH, the solutions obtained in the electrolyses carried out at different pH values were stored at different temperatures and the oxidant concentrations were monitored.…”

Section: Electrolysis Studymentioning

confidence: 59%

“…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%

“…The advantageous properties described above have led to great improvements (in both efficiency and electrode stability) in the use of conductive diamond in the electrosynthesis of oxidants. A number of recent studies have been published in which the generation of peroxodisulphates [33], peroxodiphosphate [13], percarbonates [34], ferrates [35] and hypochlorite [37] by electrochemical techniques are described. Significant improvements are reported as compared to more commonly used synthesis methods.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Electrolysis Studymentioning

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrochemical synthesis of peroxomonophosphate using boron-doped diamond anodes

et al. 2007

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“…Como exemplos dos processos industriais de eletrossíntese podem ser citados a dimerização redutiva de acrilonitrila, a hidrogenação de heterociclos, a redução de compostos nitroaromáticos, a Reação de Kolbe, a fluorização de Simons, a oxidação de hidrocarbonetos aromáticos e as reações de metoxilação, entre outros 124,125 . Na literatura, os trabalhos encontrados sobre o uso de eletrodos de diamante na síntese de compostos orgânicos compreendem os constituídos por filmes de diamante dopados com boro 6,[126][127][128] . Okino et al 128 , utilizando voltametria cíclica, estudaram a oxidação anódica do 1,4 difluorbenzeno e mostraram que os eletrodos de diamante possuem ampla janela de potencial e estabilidade eletroquímica podendo ser usados como material anódico para a fluoração eletroquímica e, possivelmente, para a produção eletrolítica do fluoreno 129 .…”

Section: Figura 2 Espectros Raman Dos Filmes Nanodiamantes Crescidosunclassified

“…Okino et al 128 , utilizando voltametria cíclica, estudaram a oxidação anódica do 1,4 difluorbenzeno e mostraram que os eletrodos de diamante possuem ampla janela de potencial e estabilidade eletroquímica podendo ser usados como material anódico para a fluoração eletroquímica e, possivelmente, para a produção eletrolítica do fluoreno 129 . Serrano et al 126 investigaram a oxidação do ácido sulfúrico, mostrando que a eficiente oxidação do ácido sulfúrico concentrado (2M) em ácido peroxidissulfúrico pôde ser alcançada em temperatura moderada (8-10 °C) com uma eficiência de corrente constante para um valor máximo de 95%. O ácido peroxidissulfúrico pode ser usado em tratamentos de efluentes, clareamento de fibras, etc 126 .…”

Section: Figura 2 Espectros Raman Dos Filmes Nanodiamantes Crescidosunclassified

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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Environmental Remediation with Electrochemical Technologies

Chen

Rajić

Zhao

et al. 2018

Kirk-Othmer Encyclopedia of Chemical Technology

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Significant concerns continue to be raised over environmental pollution of soils and water resources. Chemical fate and transport coupled with redox manipulation are the primary processes that have been considered for removing contamination and minimizing exposure. Electrochemical processes utilize electron transfer to drive transport of chemicals and redox manipulation for treatment of contaminated media. Electrokinetic remediation relies on the electric field to transport contaminants in low permeability soils toward the electrode vicinity for removal. In water cleanup, both electroreduction and electrooxidation have been used. Electroreduction has been used for dechlorination and defluorination of halogenated calcitrant compounds. Electrooxidation has also gained significant potential for transformation of many legacy and emerging contaminants. For example, organic contaminants could be oxidized directly on anode surface (direct anodic oxidation), by electrochemically generated hydroxyl radicals or by other electrochemically generated oxidants (indirect anodic oxidation). In this article, we present an overview of the state‐of‐the‐art electrochemical processes for treatment of contaminated soil and water. We also describe a perspective for future research directions in the field of electrochemical treatment of contaminated media.

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Electrochemical preparation of peroxodisulfuric acid using boron doped diamond thin film electrodes

Abstract: OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible.

Cited by 302 publications

References 22 publications

Electrochemical synthesis of peroxomonophosphate using boron-doped diamond anodes

Electrochemical synthesis of peroxomonophosphate using boron-doped diamond anodes

Filmes de nanodiamantes para aplicações em sistemas eletroquímicos e tecnologia aeroespacial

Environmental Remediation with Electrochemical Technologies

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