Electrochemical oxidation of phenolic wastewaters using a batch-stirred reactor with NaCl electrolyte and Ti/RuO2 anodes

Fajardo, Ana S.; Seca, Helga F.; Martins, Rui C.; Corceiro, Vanessa N.; Freitas, Inês F.; Quinta‐Ferreira, Mário; Quinta‐Ferreira, Rosa M.

doi:10.1016/j.jelechem.2016.12.033

Cited by 83 publications

(26 citation statements)

References 59 publications

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“…RuO 2 is an active catalytic material in a variety of processes, including catalytic CO [1][2][3], NH 3 [4], alcohol [5], and Hg oxidation [6], as well as in electrochemical phenolic wastewater oxidation [7], or as an anode in water splitting cells [8]. In addition to its electrochemical applications [9,10], one of the most significant industrial uses of RuO 2 is in HCl oxidation (Deacon process), where it is the best performing catalyst to produce molecular chlorine at low temperature [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Mechanism of ethylene oxychlorination over ruthenium oxide

Higham

Scharfe

Capdevila‐Cortada

et al. 2017

Journal of Catalysis

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The oxychlorination of ethylene is an industrially relevant process within the manufacture of polyvinyl chloride (PVC). Although RuO 2 is the best performing catalyst for the Deacon process (4HCl + O 2 ? 2H 2 O + 2Cl 2), experiments demonstrate a modest activity in the selective oxychlorination to vinyl chloride, favouring oxidation and polychlorinated saturated products. From the computational modelling three main contributions are found to control the performance: (i) coverage effects that alter the configuration of intermediates; (ii) the monodimensional arrangement of the active sites, in which the reaction of coadsorbed species works on a ''first-come, first-served" basis; and (iii) the high reactivity of the oxygen species. Competition between oxidation and chlorination processes results in variable selectivity, depending on the reaction conditions (particularly temperature and reactant partial pressures), which influence the surface composition. From the analysis of the complex reaction network, the essential requirements for a good oxychlorination catalyst are formulated.

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Section: Introductionmentioning

confidence: 99%

Mechanism of ethylene oxychlorination over ruthenium oxide

Higham

Scharfe

Capdevila‐Cortada

et al. 2017

Journal of Catalysis

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“…NaCl was selected as the electrolyte in this experiment, and therefore, many active chlorine species, such as Cl 2 , ClO − , and HClO were generated in the solution. In the process of electrolysis, until pH 3.0, the main active chlorine species was Cl 2 (aq), while the main substance in the pH range of 3–8 was HCLO and the main substance for pH > 8 was ClO − [45]. In addition, Tang [46] reported that high acidity could enhance the formation of free radicals, therefore DON was more susceptible to oxidation in this study.…”

Section: Resultsmentioning

confidence: 84%

The Degradation of Deoxynivalenol by Using Electrochemical Oxidation with Graphite Electrodes and the Toxicity Assessment of Degradation Products

Xiong

Zhao

et al. 2019

Toxins

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Deoxynivalenol (DON) is a common mycotoxin, which is known to be extremely harmful to human and livestock health. In this study, DON was degraded by electrochemical oxidation (ECO) using a graphite electrode and NaCl as the supporting electrolyte. The graphite electrode is advantageous due to its electrocatalytic activity, reusability, and security. The degradation process can be expressed by first-order kinetics. Approximately 86.4% of DON can be degraded within 30 min at a potential of 0.5 V. The degradation rate reached 93.2% within 30 min, when 0.5 V potential was used for electrocatalyzing a 10 mg/L DON solution. The degradation rate of DON in contaminated wet distiller’s grain with solubles (WDGS) was 86.37% in 60 min. Moreover, results from the cell counting kit-8 (CCK-8) and 4,6-diamidino-2-phenylindole dihydrochloride (DAPI) staining assay indicated that ECO reduced the DON-induced cytotoxicity and apoptotic bodies in a gastric epithelial cell line (GES-1) compared to the DON-treated group. These findings provide new insights into the application of ECO techniques for degrading mycotoxins, preventing food contamination, and assessing DON-related hazards.

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“…In the cathodic recirculation, the COD and TOC reduction was 64.3 and 71% higher than the reduction achieved in the anodic recirculation. The reduction in the anodic chamber recirculation could have been partially due to direct oxidation of the organics on the surface of the electrode and majorly due to indirect oxidation in the bulk anolyte by the reactive chlorine species generated from inherent chloride (50-185 mg/L) present in the wastewater (Martínez-Huitle and Ferro, 2006;Fajardo et al, 2017). In the cathode chamber, the COD and TOC reduction could be majorly due to movement of the negatively charged smaller sized organics, the phospho-sugars like GDP-D-Glucose, CDP-D-Glucose, etc.…”

Section: Discussionmentioning

confidence: 99%