Electrochemical degradation of Novacron Yellow C-RG using boron-doped diamond and platinum anodes: Direct and Indirect oxidation

Rocha, Jessica; Gomes, Maésia M. Soares; Santos, Elisama Vieira dos; Moura, Elaine Cristina Martins de; Silva, Djalma Ribeiro da; Quiróz, Marco A.; Martínez‐Huitle, Carlos A.

doi:10.1016/j.electacta.2014.06.030

Cited by 86 publications

(15 citation statements)

References 28 publications

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“…7 In this scenario, the effects of sulfate electrolyte on the electrochemical oxidation of organics had previously been investigated by many researchers. [8][9][10][11][12] As a result, in these studies, the sulfate concentration demonstrated either positive or inapparent effects. However, quite different observations were recently obtained by our research group in studying the degradation of bromophenol blue (BPB) and Acid Orange-II with BDD anodes.…”

mentioning

confidence: 89%

The Peculiar Roles of Sulfate Electrolytes in BDD Anode Cells

Zhang

et al. 2015

J. Electrochem. Soc.

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Taking bromophenol blue as pollutant model, the role of sulfate electrolytes during the anodic oxidations was investigated in a wide range of concentrations (0.1-500 mM). Trials were performed with an electrochemical cell containing boron-doped diamond anode and stainless steel cathode. The impact of sulfate concentration on the degradation performance was assessed by comparing the color removal efficiencies at various time intervals. The results revealed a significant and peculiar influence of this parameter on the degradation efficiency. Thus, we emphasize the importance of selection of operating levels in electrolytic oxidations, especially when certain activators (from the cathode) may be formed in the treated solutions.Using boron-doped diamond (BDD) anodes to mineralize biorefractory organic pollutants has been one of the most active areas of research interest in environmental electrochemistry within the last decade. 1 Specifically, the rate and efficiency of BDD technology are strongly dependent on the employed supporting electrolytes. 2-4 So far, various electrolytes like NaCl, Na 2 SO 4 , Na 2 CO 3 , Na 3 PO 4 and NaNO 3 have been evaluated for the electrochemical destruction of organic pollutants, and Na 2 SO 4 has often been reported to be the most effective one regarding degradation improvements. 5,6 As is known, sulfate electrolyte exhibits many advantages, such as low price, high electrical conductivity, and low reactivity on both anode and cathode. Hence, it is generally recognized as an inert electrolyte which solely serves as a conducting media. However, in BDD anode cells, the presence of sulfate electrolyte (>20 mM) may lead to the formation of persulfate ions (S 2 O 8 2− ), which will spread to the bulk solution and participate in the oxidation reactions. 7 In this scenario, the effects of sulfate electrolyte on the electrochemical oxidation of organics had previously been investigated by many researchers. [8][9][10][11][12] As a result, in these studies, the sulfate concentration demonstrated either positive or inapparent effects. However, quite different observations were recently obtained by our research group in studying the degradation of bromophenol blue (BPB) and Acid Orange-II with BDD anodes. 13,14 In these two studies, increasing sulfate concentration will result in a significant decrease of the degradation efficiency. This phenomenon is explained by the hypothesis that sulfate ions of higher concentrations may block the active sites of BDD surface and thus reduce the efficiency of •OH formation (the blocking effect).Since differing effects of sulfate electrolyte have been reported by various researchers, there is an urgent need for their better clarifications. In this scenario, we report here the first comprehensive investigation on the impacts of sulfate concentration during the BDD anodic oxidations. BPB, a biorefractory dye pollutant, extensively used in textile industries and college laboratories, was employed as a pollutant model (see Fig. 1). As expected, the results obtained ...

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confidence: 89%

The Peculiar Roles of Sulfate Electrolytes in BDD Anode Cells

Zhang

et al. 2015

J. Electrochem. Soc.

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“…OH) produced because of the larger overpotential required for O 2 evolution along with the very weak BDD‐ . OH interaction . At present, the BDD anode is considered the best material for these methods.…”

Section: Introductionmentioning

confidence: 99%

“…OH) and . OH are the main oxidants, with optimum pH near 3 ,,. Reduction of Fe 3+ to Fe 2+ at the cathode propagates Fenton's reaction (3) ,,.…”

Section: Introductionmentioning

confidence: 99%

Use of Pt and Boron‐Doped Diamond Anodes in the Electrochemical Advanced Oxidation of Ponceau SS Diazo Dye in Acidic Sulfate Medium

et al. 2017

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The electrochemical degradation of 2.5 L of Ponceau SS diazo dye solution in acidic sulfate medium has been studied in a prepilot flow plant with a boron-doped diamond (BDD)/airdiffusion or Pt/air-diffusion cell connected to an annular photoreactor. The decolorization and mineralization was enhanced in the order: electrochemical oxidation with electrogenerated H 2 O 2 < electro-Fenton < photoelectro-Fenton. The two former methods performed better with the BDD anode, whereas the latter yielded similar results for both anodes. From this, the use of less expensive active anodes such as Ti j Pt instead of nonactive BDD for photo-assisted Fenton-based electrochemical processes is recommended. In all methods, increasing current density led to a greater degradation rate, but with lower mineralization current efficiency and higher energy consumption. Five primary aromatic products and four final carboxylic acids were detected, along with recalcitrant products poorly removed by hydroxyl radicals and UVA radiation.

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“…(1)); nevertheless, the different electrocatalytic characteristics led to this differentiated behavior. In general, it has been reported that BDD anodes present higher pollutant removal capacity due to their lower enthalpy of adsorption of • OH (Kapalka et al 2009;Rocha et al 2014;Garcia-Segura et al 2015;Martínez-Huitle et al 2015). Meanwhile; those radicalary species became strongly adsorbed onto the Pt surface, where higher oxides became the main oxidant mediators from Eq.…”

Section: Decolorization Of Washing Machine Effluent By Different Elecmentioning

confidence: 99%

Electrochemical advanced oxidation processes as decentralized water treatment technologies to remediate domestic washing machine effluents

Santos

Costa

Silva

et al. 2017

Environ Sci Pollut Res

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Water scarcity is one of the major concerns worldwide. In order to secure this appreciated natural resource, management and development of water treatment technologies are mandatory. One feasible alternative is the consideration of water recycling/reuse at the household scale. Here, the treatment of actual washing machine effluent by electrochemical advanced oxidation processes was considered. Electrochemical oxidation and electro-Fenton technologies can be applied as decentralized small-scale water treatment devices. Therefore, efficient decolorization and total organic abatement have been followed. The results demonstrate the promising performance of solar photoelectro-Fenton process, where complete color and organic removal was attained after 240 min of treatment under optimum conditions by applying a current density of 66.6 mA cm. Thus, electrochemical technologies emerge as promising water-sustainable approaches.

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Electrochemical degradation of Novacron Yellow C-RG using boron-doped diamond and platinum anodes: Direct and Indirect oxidation

Cited by 86 publications

References 28 publications

The Peculiar Roles of Sulfate Electrolytes in BDD Anode Cells

The Peculiar Roles of Sulfate Electrolytes in BDD Anode Cells

Use of Pt and Boron‐Doped Diamond Anodes in the Electrochemical Advanced Oxidation of Ponceau SS Diazo Dye in Acidic Sulfate Medium

Electrochemical advanced oxidation processes as decentralized water treatment technologies to remediate domestic washing machine effluents

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