Understanding ozone generation in electrochemical cells at mild pHs

Rodríguez-Peña, M.; Pérez, J.; Llanos, Javier; Sáez, Cristina; Barrera-Díaz, Carlos; Rodrigo, Manuel A.

doi:10.1016/j.electacta.2021.138033

Cited by 33 publications

(25 citation statements)

References 37 publications

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“…Figures 2-7 display the predictions of two models, which are described and discussed in the final part of this section. The predictions in blue correspond to a model developed in a previous work [31] for the production of ozone at mild pH values, while lines in black correspond to a model adapted for the production of ozone at acidic pH.…”

Section: Resultsmentioning

confidence: 99%

“…Conversely, it can only be explained by considering the formation of third species which act as scavengers of the formed ozone. It is already known [31] that oxidants can easily interact with each other decomposing and forming other species with various oxidation capacities. This way, the Time / s interaction of ozone with hydrogen peroxide (eq 7) or with monoperoxosulfuric acid (eq 9) promotes the formation of radicals, which following different mechanisms lead to the formation of oxygen.…”

Section: Influence Of the Operation Modementioning

confidence: 99%

“…SM1. This first model was proposed in a previous manuscript [31], trying to explain the production of ozone at mild pH conditions according to experimental observations and it was found to very satisfactorily because it reproduce the behavior of electrolytic ozone production in continuous and discontinuous modes and also the influence of current density.…”

Section: Degradation Of Pollutantsmentioning

confidence: 99%

“…Hence, electrochemistry and chemistry of oxygen-containing species in electrolytic systems aiming to promote the production of ozone are rather complex and should be the key to find out an effective production technology for ozone. In a previous paper [31], a model was proposed to explain the performance of an electrolyzer producing ozone at near-neutrality pH conditions. This model helped to explain the evolution of ozone during continuous and discontinuous processes as well as the influence of current density on the production of this compound.…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical generation of ozone using a PEM electrolyzer at acidic pHs

Rodríguez-Peña

Barrios

Llanos

et al. 2021

Separation and Purification Technology

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Section: Resultsmentioning

confidence: 99%

Section: Influence Of the Operation Modementioning

confidence: 99%

Section: Degradation Of Pollutantsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrochemical generation of ozone using a PEM electrolyzer at acidic pHs

Rodríguez-Peña

Barrios

Llanos

et al. 2021

Separation and Purification Technology

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“…Ozone is produced in equipment called ozonators or ozone generators and is created from pure oxygen supplied from a cylinder (6% ozone concentration) or treated air (1-3% ozone concentration) directly at the manufacturing plant. Such devices produce from few to over 100 mg/L (Muzafarov, Batirova, Babaev, & Kilichov, 2020;Nassour et al, 2018;Rodríguez-Peña et al, 2021). The most powerful ones are used, among others, by hospitals for disinfection of surgical instruments.…”

Section: Introductionmentioning

confidence: 99%

Application of ozonation as a clean method of herbs freshness prolongation: Experiment and model construction

Postawa

Klimek

Kapłan

et al. 2021

J Food Process Engineering

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Ecological food preservation and freshness prolongation is an important issue in the food industry. Most of the common methods required the addition of chemical preservatives which is widely criticized. In this article, a novel approach for herbs keeping by ozonation is presented. The process is studied both in experimental and modeling approaches. The considered parameters were dry mass, L-ascorbic acid concentration, carotenoids, essential oils, flavonoids, and polyphenols content. Also, the antioxidation activity of tested food is verified. The experiment examined the impact of ozonation with concentration up to 0.9 ppm, on the 7-days storage of mint and rosemary in refrigerated conditions. The positive impact of ozone on almost all the tested parameters was proved for moderate concentrations of this factor. The one exception was essential oils, which turned out to be too susceptible for oxidation.The presented mathematical model indicated very good convergence with experimental results-the mean relative error, except essential oil, does not exceed 2% for both of the tested herbs. This indicated clearly that the presented tool can be used for further optimization of the process, with high practical application.

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Towards the production of chlorine dioxide from electrochemically in‐situ produced solutions of chlorate

Monteiro

Moratalla

Sáez

et al. 2022

J of Chemical Tech & Biotech

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BACKGROUND This work focuses on the electrochemical production of chlorate solutions for direct use and integration in the manufacture of chlorine dioxide (ClO2), from the perspective of manufacturing portable ClO2 electrochemical generators. RESULTS Chlorate production was evaluated from the oxidation of sodium chloride (NaCl) contained in brackish solutions (20 g L−1) and brines (200 g L−1) in single chamber flow electrochemical cells. Efficiency in chlorate ion (ClO3−) production increased with temperature and NaCl concentration, but the use of brackish solutions led to a higher quality product, as compared to the brines, with lower concentration of chlorine and hypochlorous acid. To evaluate the production of ClO2, samples corresponding to two different qualities of the electrogenerated solutions underwent stripping to exhaust chlorine, before being mixed with hydrogen peroxide (H2O2) and sulfuric acid. Results showed that using a chlorate solution obtained from the electrolysis of 20 g L−1 NaCl solution at 50 mA cm−2 and passing 57.35 Ah L−1, a maximum concentration of 33.3 mmol L−1 ClO2 could be attained, which corresponds to a maximum conversion of 48.75%. CONCLUSIONS Efficiency of the synthesis depends on both the purity of chlorate and the H2O2/ClO3− ratio. This confirms that in‐situ electrogenerated chlorate can be used to manufacture ClO2, but there are still many gaps to be overcome and further work must be carried out to optimize the production of the desired oxidant in a portable ClO2 device. © 2022 The Authors. Journal of Chemical Technology and Biotechnology published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry (SCI).

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Understanding ozone generation in electrochemical cells at mild pHs

Cited by 33 publications

References 37 publications

Electrochemical generation of ozone using a PEM electrolyzer at acidic pHs

Electrochemical generation of ozone using a PEM electrolyzer at acidic pHs

Application of ozonation as a clean method of herbs freshness prolongation: Experiment and model construction

Towards the production of chlorine dioxide from electrochemically in‐situ produced solutions of chlorate

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