Ozone-based electrochemical advanced oxidation processes

Bavasso, Irene; Montanaro, Daniele; Petrucci, Elisabetta

doi:10.1016/j.coelec.2022.101017

Cited by 11 publications

(6 citation statements)

References 63 publications

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“…Under the condition of pH = 10, the yield of H 2 O 2 decreased significantly compared to pH = 4 and 7, which was due to the fact that H 2 O 2 was more easily decomposed under alkaline conditions (eqs 5 and 6). 49 Under acidic and neutral conditions, a high concentration of H + could promote the production of H 2 O 2 . In summary, different operating conditions had a great impact on the H 2 O 2 production and current efficiency.…”

Section: Effects Of Run Conditions On H 2 O 2 Productionmentioning

confidence: 99%

Novel E-Peroxone Process with Tandem Flow-Through Configuration: In Situ O₂ Supplement and Efficient Ozone Utilization

Zhang,

Tang,

Shen

et al. 2024

ACS EST Water

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A novel E-peroxone process with tandem flow-through (TFT) configuration was developed in this work, and its efficacy was verified via the degradation of recalcitrant compounds, i.e., dyes and poly(vinyl alcohol) (PVA). The gas diffusion electrode (GDE) made of carbon fiber was employed as the cathode, while the anode of ruthenium−iridium acted as a dimensionally stable anode (DSA). The system achieved oxygen self-sufficiency through an innovative oxygen transfer mode, avoiding the need for an additional oxygen supply. The electrodes with TFT configuration ensured high utilization efficiency of ozone as the peroxone reaction occurred continuously in two adjacent chambers. H 2 O 2 yield efficiency was compared between single and TFT E-peroxone processes under various conditions, including flow rates, current densities, and pH values. Under optimal H 2 O 2 production conditions, the TFT E-peroxone process could remove 85.5% of dyes and 73.4% of PVA with singlepass, respectively. Electron paramagnetic resonance (EPR) tests and quenching experiments revealed that hydroxyl radicals ( • OH) and carbon radicals are the primary active species. Hydroxyl radicals played a major role in the single and TFT E-peroxone processes. This study demonstrates that the TFT E-peroxone process holds great promise as an advanced technology for efficient wastewater treatment.

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Section: Effects Of Run Conditions On H 2 O 2 Productionmentioning

confidence: 99%

Novel E-Peroxone Process with Tandem Flow-Through Configuration: In Situ O₂ Supplement and Efficient Ozone Utilization

Zhang,

Tang,

Shen

et al. 2024

ACS EST Water

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“…Thus, the main limitation in their use is the composition of the electrolyte used to manufacture them, because of the difficulties in the separation of the oxidants and the salts contained in the electrolyte in a cheap and efficient way. 40 This problem can be detached when the oxidant produced is a gas, like in the cases of chlorine, ozone 51,52 and chlorine dioxide, 53,54 because in those cases, the electrolyte used for the production is not added to the waste that is expected to be treated, but simply a gaseous stream containing the oxidant gas, because they can be easily stripped from the electrolyte solution by flowing air and this becomes a very important advantage. This means that the fingerprint of this technology is going to be less important than that obtained with other more aggressively mediated processes.…”

Section: Introductionmentioning

confidence: 99%

Treatment of Organics in Wastewater Using Electrogenerated Gaseous Oxidants

da Silva,

Mena,

Saez

et al. 2024

Ind. Eng. Chem. Res.

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This work focuses on the comparison of the performance of direct electrochemical oxidation with indirect electrolysis mediated by gaseous oxidants in the treatment of diluted wastewater. To do this, energy consumptions of the electrolysis using mixed metal oxide (MMO) electrodes are compared with those required for the production and use of chlorine dioxide in the degradation of methomyl contained in aqueous solutions. Results demonstrate the feasibility of the mediated oxidation process and that this process is competitive with direct oxidation. The oxidants are produced under optimized conditions using the same anodic material applied for the direct degradation of organics, thus avoiding efficiency losses associated with mass transfer limitations in the degradation of dilute organic solutions. Thus, using the ClO 2 gaseous oxidant, a concentration of 0.1 mM of methomyl from a solution containing 500 mL is completely removed with an energy consumption as low as 50 Wh. The application of the same energy to a direct electrolytic process for treating the same wastewater can only reach less than half of this removal. These findings may have a very important application in the use of electrochemical technology to achieve the remediation of persistent pollutants in wastewater, where their low concentrations typically make direct processes very inefficient.

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“…This also implies slower deterioration of the electrode materials and improved selectivity in the reactions with electrogeneration of fewer unwanted byproducts. For these reasons, many ongoing studies focus on the development of cathodic processes especially for environmental protection, , and the advancement of cathode materials for CO 2 and nitrate electroreduction as well as for battery applications. , …”

Section: Introductionmentioning

confidence: 99%

Copper-Decorated Titanium Electrodes: Impact of Surface Modifications of Substrate on the Morphology and Electrochemical Performance

Sotgiu,

De Santis,

Orsini

et al. 2024

ACS Appl. Mater. Interfaces

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This study investigates the effect of surface modifications of the titanium substrate on the growth of electrochemically deposited copper. These materials are intended to serve as cathodes in the electroreduction of nitrates in aqueous solutions. Surface modifications included the use of hydrogen fluoride for titanium etching and anodization to promote the growth of a structured titania nanotube array. The effect of an intermediate calcination step for the nanotubes before deposition was assessed along with a comparison to an untreated substrate electrode. The materials were comprehensively characterized by SEM, XRD, contact angle, potentiodynamic tests, EIS, and cyclic voltammetry. Their electrocatalytic ability was tested in the reduction of aqueous solutions containing nitrates. The results reveal that surface finishing impacted the shape and size of the Cu microparticles, as well as the nucleation mechanism enabling a crystalfacet-controllable synthesis. All the materials exhibited microsized copper particles with a spherical shape with some clusters. On the etched titanium surface, a high number of heterogeneous submicroscopic particles were also present. The thermally treated anodized substrate promoted the development of a combination of sparse microparticles corresponding to defect sites in amorphous titanium and the presence of a diffuse coating of octahedral nanosized particles whose growth was promoted by the tetragonal structure of anatase crystals. Electrochemical tests display reduced charge transfer resistance upon copper deposition on the modified substrates, which is indicative of the enhanced conductivity of the coated materials. Additionally, cyclic voltammetry and electrolysis experiments reveal the electrodes' potential for nitrate reduction, showing a better response for the etched titanium substrate (30% nitrate removal, after 2 h at 25 mA cm −2 ).

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Ozone-based electrochemical advanced oxidation processes

Cited by 11 publications

References 63 publications

Novel E-Peroxone Process with Tandem Flow-Through Configuration: In Situ O₂ Supplement and Efficient Ozone Utilization

Novel E-Peroxone Process with Tandem Flow-Through Configuration: In Situ O₂ Supplement and Efficient Ozone Utilization

Treatment of Organics in Wastewater Using Electrogenerated Gaseous Oxidants

Copper-Decorated Titanium Electrodes: Impact of Surface Modifications of Substrate on the Morphology and Electrochemical Performance

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Ozone-based electrochemical advanced oxidation processes

Cited by 11 publications

References 63 publications

Novel E-Peroxone Process with Tandem Flow-Through Configuration: In Situ O2 Supplement and Efficient Ozone Utilization

Novel E-Peroxone Process with Tandem Flow-Through Configuration: In Situ O2 Supplement and Efficient Ozone Utilization

Treatment of Organics in Wastewater Using Electrogenerated Gaseous Oxidants

Copper-Decorated Titanium Electrodes: Impact of Surface Modifications of Substrate on the Morphology and Electrochemical Performance

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Product

Resources

About

Novel E-Peroxone Process with Tandem Flow-Through Configuration: In Situ O₂ Supplement and Efficient Ozone Utilization

Novel E-Peroxone Process with Tandem Flow-Through Configuration: In Situ O₂ Supplement and Efficient Ozone Utilization