Production of Strong Oxidizing Substances with BDD Anodes

Sánchez-Carretero, A.; Sáez, Cristina; Cañizares, Pablo; Rodrigo, Manuel A.

doi:10.1002/9781118062364.ch12

Cited by 7 publications

(8 citation statements)

References 46 publications

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“…Above 0.02 mol dm −3 , the anode potential becomes increasingly buffered by the halide electroactivity. This behavior can be attributed to an interaction between hydroxyl radicals (physisorbed) and Cl − to form active chlorine species (e.g., Cl − + • OH → ClO − + H + + e − ) on BDD surface [22,23]. It may justify the formation of many new types of oxidants (desirable and undesirable [9,11], such as Cl • , Cl 2 , ClO 2 − and ClO 3 − , ClO 4 − , respectively) with this non-active material.…”

Section: Polarization Curves In the Presence Of Halide Ionmentioning

confidence: 98%

“…3b) indicate that the last condition was not attained. This behavior could be due to the use of applied current to favor other electrochemical processes, such as the production of oxidants and the oxidation/reduction of ions [22]. In fact, the existing concentrations of Cl − , NO 3 − and SO 4 2− in the effluent (as-obtained) promote the occurrence of parallel reactions, consuming the applied current.…”

Section: Cod Removal By Electrochemical Treatmentmentioning

confidence: 98%

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Cl-mediated electrochemical oxidation for treating an effluent using platinum and diamond anodes

Moura

Brito

Quiróz

et al. 2015

Journal of Water Process Engineering

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Section: Polarization Curves In the Presence Of Halide Ionmentioning

confidence: 98%

Section: Cod Removal By Electrochemical Treatmentmentioning

confidence: 98%

Cl-mediated electrochemical oxidation for treating an effluent using platinum and diamond anodes

Moura

Brito

Quiróz

et al. 2015

Journal of Water Process Engineering

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“…Figure 6 shows the evolution of chlorine species at the two current densities evaluated. It is worth to remark that chlorine is known to exhibit a high reactivity during electrolysis (Lacasa et al 2012a, Sánchez-Carretero et al 2011b, Brito et al 2016. Thus, the electrochemical oxidation of chloride generates hypochlorite (Eqs.…”

Section: Electrolysis Photoelectrolysis Sonoelectrolysismentioning

confidence: 99%

Electrolytic and electro-irradiated technologies for the removal of chloramphenicol in synthetic urine with diamond anodes

et al. 2018

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Hospital effluents are a major source for the occurrence of pharmaceuticals in the environment. In this work, the treatment of synthetic urine polluted with chloramphenicol is studied by using three different conductive-diamond electrochemical oxidation technologies: electrolysis (single electrolysis), photoelectrolysis and high-frequency ultrasound sonoelectrolysis. These technologies were evaluated at 10 and 100 mA cm. Results shows that not only chloramphenicol but also other organics contained in urine are completely mineralized by electrolysis. Ammonium is the main inorganic nitrogen species formed and it can react with the electrogenerated hypochlorite, favouring the formation of chloramines. These species prevent the potential formation of perchlorate from chlorides contained in urine at low current densities (10 mA cm) and delay its occurrence at high current densities (100 mA cm). On the other hand, irradiation of ultraviolet (UV) light or high-frequency ultrasound (US) produce changes in the performance of the electrolytic treatment, but these changes are not as important as in other cases of study shown in the literature. Nonetheless, the effect of electroirradiated technologies seems to be higher and depends on the type of pollutant when working at low current densities (10 mA cm). It is positive in the case of the degradation of the antibiotic and the uric acid and negative in the case of urea where there is a clear antagonistic effect. Production of oxidants increases with the current density although in lower ratio than expected. These results are of great importance because clearly point out that electrolytic technologies can be applied to minimize the diffuse pollution associated to pharmaceuticals before discharge into municipal sewers.

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“…Among these approaches, electrochemical oxidation (EO) is the most used, and the recent studies have evidenced the importance of the development of new electrode materials as well as the combination with other technologies, in irder to intensify its efficiency (Bebelis et al, 2013;Sir es et al, 2014). In the former, the introduction of conductive diamond coatings was a significant scientific contribution in the EO (Rodrigo et al, 2001;Polcaro et al, 2004Polcaro et al, , 2005Cerisola, 2005, 2009;Martinez-Huitle and Ferro, 2006;Sanchez-Carretero et al, 2011;Scialdone et al, 2012;Sires and Brillas, 2012;Borras et al, 2013;Panizza and Martinez-Huitle, 2013;Brillas and Martínez-Huitle, 2015;Martínez-Huitle et al, 2015) due to its chemical and electrochemical stability as well as the efficient use of the electricity. Diamond coatings are considered as "non-active" anodes (Panizza and Cerisola, 2009;Sanchez-Carretero et al, 2011;Scialdone et al, 2012;Borras et al, 2013;Panizza and Martinez-Huitle, 2013;Brillas and Martínez-Huitle, 2015;Martínez-Huitle et al, 2015) during EO process.…”

Section: Introductionmentioning

confidence: 99%

“…Although the applicability of the EO seems feasible due to its environmental compatibility, amenability of automation, high energy efficiency, versatility and safety operating at mild conditions (Polcaro et al, 2004(Polcaro et al, , 2005Oturan et al,. 2008;Sanchez-Carretero et al, 2011;Scialdone et al, 2012;Panizza and Martinez-Huitle, 2013); combination of this electrochemical technology with other processes (oxidants production, ultraviolet light (UVC) irradiation or ultrasound (US) irradiation) is becoming the new technological challenge (Polcaro et al, 2009;Scialdone et al, 2009a;Vacca et al, 2011;Wols and Hofman-Caris, 2012;Shih et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Improving the catalytic effect of peroxodisulfate and peroxodiphosphate electrochemically generated at diamond electrode by activation with light irradiation

Araújo¹,

Sáez

Cañizares

et al. 2018

Chemosphere

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Boron doped diamond (BDD) anode has been used to oxidatively remove Rhodamine B (RhB), as persistent organic pollutant, from synthetic wastewater by electrolysis, photoelectrolysis and chemical oxidation containing sulfate and phosphate as supporting electrolytes. RhB is effectively oxidized by electrolysis and by chemical oxidation with the oxidants separately produced by electrolyzing sulfate or phosphate solutions (peroxodisulfate and peroxodiphosphate, respectively). The results showed that light irradiation improved the electrolysis of RhB due to the activation of oxidants under irradiation at high current densities. Meanwhile, the efficiency of the chemical oxidation approach by ex situ electrochemical production of oxidants was not efficient to degrade RhB.

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Production of Strong Oxidizing Substances with BDD Anodes

Cited by 7 publications

References 46 publications

Cl-mediated electrochemical oxidation for treating an effluent using platinum and diamond anodes

Cl-mediated electrochemical oxidation for treating an effluent using platinum and diamond anodes

Electrolytic and electro-irradiated technologies for the removal of chloramphenicol in synthetic urine with diamond anodes

Improving the catalytic effect of peroxodisulfate and peroxodiphosphate electrochemically generated at diamond electrode by activation with light irradiation

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