Pressurized electro-Fenton for the reduction of the environmental impact of antibiotics

Moratalla, Ángela; Araújo, Danyelle Medeiros de; Moura, Gabriel O.M.A.; Lacasa, Engracia; Cañizares, Pablo; Rodrigo, Manuel A.; Sáez, Cristina

doi:10.1016/j.seppur.2021.119398

Cited by 34 publications

(31 citation statements)

References 35 publications

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“…The electrolytic tests were performed in a microfluidic flow-through cell (MF-FT) with a pressurized-jet aeration (PJA), as described elsewhere. 20 It consisted of a tank, a pump (that supplied a constant flow rate of 140 L h –1 ), a jet aerator, a heat exchanger, and an MF-FT reactor. In this MF-FT cell, the electrodes are separated by a polytetrafluoroethylene (PTFE) film with an interelectrode gap of 150 μm.…”

Section: Methodsmentioning

confidence: 99%

“…These supports were modified with a mixture of carbon black (CB, Vulcan XC72 from cabot corporation) and PTFE. The modification of the cathodes was carried out following the same procedure as the one described by Moratalla et al 20 Perchloric acid (3000 mg L –1 at pH values of 1.5 and 3.0) and sulfuric acid were used as supporting electrolytes. The current intensities used in the different experiments were 0.25 and 2.50 A in the discontinuous mode without the temperature control and with the temperature control at 11.5 °C, respectively.…”

Section: Methodsmentioning

confidence: 99%

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Electrochemical Production of Hydrogen Peroxide in Perchloric Acid Supporting Electrolytes for the Synthesis of Chlorine Dioxide

Monteiro

Moratalla

Sáez

et al. 2022

Ind. Eng. Chem. Res.

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This work focuses on the electrochemical production of hydrogen peroxide in supporting electrolytes containing perchlorate ions for being used as a reagent in the reduction of chlorates to produce chlorine dioxide, as a first step in the manufacture of portable ClO 2 production devices. This study evaluates the effect of the current density, pressure, and temperature on the production of hydrogen peroxide, and concentrations over 400 mg L –1 are reached. The average rate for the formation of hydrogen peroxide is 9.85 mg h –1 , and the effect of increasing electrolyte concentration (3.0 and 30.0 g L –1 perchloric acid), intensity, and pressure results in values of, respectively, −2.99, −4.49, and +7.73 mg h –1 . During the manufacturing process, hydrogen peroxide is decomposed through two mechanisms. The average destruction rate is 1.93 mg h –1 , and the effects of the three factors results in values of, respectively, +0.07, +0.11, and −0.12 mg h –1 . Solutions of this hydrogen peroxide produced electrochemically in a perchloric acid aqueous electrolyte were used to reduce chlorates in strongly acidic media and produce chlorine dioxide. Conversions of around 100% were obtained, demonstrating that this electrochemical product can be used efficiently to reduce chlorates to chlorine dioxide.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Electrochemical Production of Hydrogen Peroxide in Perchloric Acid Supporting Electrolytes for the Synthesis of Chlorine Dioxide

Monteiro

Moratalla

Sáez

et al. 2022

Ind. Eng. Chem. Res.

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“…To prove that it is feasible to use chlorate and hydrogen peroxide electrochemically produced for the generation of chlorine dioxide, two electrochemical cells were used, one for hydrogen peroxide generation and the other for chlorate generation. In this way, electrochemical production of hydrogen peroxide experiments were developed by using a microfluidic flow-through cell (MF-FT) with a pressurized-jet aeration (PJA) in a benchscale experimental set-up as described elsewhere [49]. In this cell, the inter-electrode gap was 150 µm.…”

Section: Electrochemical Cellsmentioning

confidence: 99%

“…In addition, a 3D-titanium mesh electrode modified with carbon black and polytetrafluorethylene (PTFE) was used as cathode. The modification of the electrode was carried out following the same procedure to the one described by Moratalla et al [49]. The combination of both electrodes has demonstrated a very good performance in the production of hydrogen peroxide in supporting electrolyte containing sulphate, and here the use in perchloric acid (3000 mg L −1 ) media will be assessed.…”

Section: Electrochemical Cellsmentioning

confidence: 99%

Full and Sustainable Electrochemical Production of Chlorine Dioxide

et al. 2022

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With the final purpose of manufacturing electrochemically-based devices that produce chloride dioxide efficiently, this paper focuses on the production of chlorates and hydrogen peroxide in two different electrochemical cells, in which operation conditions are selected to obtain high efficiencies, and in the subsequent combination of both electrochemically manufactured solutions to produce chlorine dioxide. Results demonstrate that suitable reagents can be produced by electrolyzing 20 g L−1 sodium chloride solutions at 50 mA cm−2 and 50 °C, and 3000 mg L−1 NaClO4 solutions at 5.0 mA cm−2 and 15 °C with current efficiencies of 30.9% and 48.0%, respectively. Different tests performed with these electrolyzed solutions, and also with commercial hydrogen peroxide and chlorate solutions, demonstrate that the ratio between both reagents plays a very important role in the efficiency in the production of chlorine dioxide. Results clearly showed that, surplus chlorate should be contained in the reagent media to prevent further reduction of chlorine dioxide by hydrogen peroxide and consequently, loses of efficiency in the process. During the reaction, a gas with a high oxidation capacity and consisting mainly in chloride dioxide is produced. The results contributed to the maximum conversion reached being 89.65% using electrolyzed solutions as precursors of ClO2, confirming that this technology can be promising to manufacture portable ClO2 devices.

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“…H2O2 + hv → 2 •OH (7) One of the main disadvantages of the electro-Fenton process is the low solubility of oxygen in water at atmospheric pressure, which significantly influences the production of hydrogen peroxide at the cathode. To overcome this limitation, Moratalla et al [94] recently reported the use of a pressurized electrochemical reactor equipped with a jet aerator for the removal of meropenem in urine, demonstrating that the electrochemical generation of hydrogen peroxide can be significantly improved by applying high pressures. Specifically, they evaluated the influence of pressure (gauge pressure range of 0 to 3 bar) on the elimination of 50 mg dm −3 meropenem in urine by the heterogeneous electro-Fenton process, using a 3D-MMO-IrO 2 Ta 2 O 5 mesh anode and a modified 3D-titanium mesh with CB/PTFE cathode at 5 mA cm −2 , pH 3 and 10.8 g goethite (heterogeneous catalyst).…”

Section: O2 (G) + 2hmentioning

confidence: 99%

Electrochemical Technologies to Decrease the Chemical Risk of Hospital Wastewater and Urine

et al. 2021

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The inefficiency of conventional biological processes to remove pharmaceutical compounds (PhCs) in wastewater is leading to their accumulation in aquatic environments. These compounds are characterized by high toxicity, high antibiotic activity and low biodegradability, and their presence is causing serious environmental risks. Because much of the PhCs consumed by humans are excreted in the urine, hospital effluents have been considered one of the main routes of entry of PhCs into the environment. In this work, a critical review of the technologies employed for the removal of PhCs in hospital wastewater was carried out. This review provides an overview of the current state of the developed technologies for decreasing the chemical risks associated with the presence of PhCs in hospital wastewater or urine in the last years, including conventional treatments (filtration, adsorption, or biological processes), advanced oxidation processes (AOPs) and electrochemical advanced oxidation processes (EAOPs).

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Pressurized electro-Fenton for the reduction of the environmental impact of antibiotics

Cited by 34 publications

References 35 publications

Electrochemical Production of Hydrogen Peroxide in Perchloric Acid Supporting Electrolytes for the Synthesis of Chlorine Dioxide

Electrochemical Production of Hydrogen Peroxide in Perchloric Acid Supporting Electrolytes for the Synthesis of Chlorine Dioxide

Full and Sustainable Electrochemical Production of Chlorine Dioxide

Electrochemical Technologies to Decrease the Chemical Risk of Hospital Wastewater and Urine

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