Electrooxidation of cardanol on mixed metal oxide (RuO2-TiO2 and IrO2-RuO2-TiO2) coated titanium anodes: insights into recalcitrant phenolic compounds

Santos, Maycon J.R.; Medeiros, Mateus C.; Oliveira, Thiago M.B.F.; Morais, Catarina M.; Mazzetto, Selma Elaine; Martínez‐Huitle, Carlos A.; Castro, Sonia

doi:10.1016/j.electacta.2016.06.145

Cited by 51 publications

(16 citation statements)

References 28 publications

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“…However, a growth of 10-fold of j from 7.1 to 70 mA cm−2 only caused an enhancement of 9% in color removal, suggesting a progressive relative loss of oxidants when Ecell varied from 4.5 to 8.1 V. This can be related to a greater increase in rate of reaction (2) compared to that of reaction (1) with production of a larger proportion of MOx+1 radicals with much lower oxidation ability than MOx( OH) ones. Moreover, the enhancement of other parasitic reactions can influence the relative decrease of these oxidants, pre-eminently their oxidation to O2 via reactions (6) and (7) [8,10], although the formation of weak oxidants like peroxodisulfate (S2O82−)ion from SO42− oxidation by reaction (8) as previously reported in several works [48][49][50] and ozone by reaction (9) [5,8] could also contribute.…”

Section: Decolorization Of Methyl Orange Solutions With Ti/ruo2 Anodementioning

confidence: 80%

“…There is an increasing interest in the study of the destruction of organic pollutants from wastewaters by means of anodic oxidation (AO). This environmentally friendly method is an electrochemical advanced oxidation process (EAOP) based on the in situ generation of hydroxyl radical (•OH) at the anode surface [1][2][3][4][5][6][7]. This radical has a high standard reduction potential (E°(•OH/H2O) = 2.80 V/ SHE) with a very short half-life of 10−4 s and can react with organics in a non-selective manner until full conversion into CO2 and inorganic ions take place.…”

Section: Introductionmentioning

confidence: 99%

“…AO can be applied to wastewaters with high chemical oxygen demand (COD) and total organic carbon (TOC), low biodegradability and toxic pollutants, working at intermediate temperatures [5,7,8]. For a high O2-overvoltage metal oxide (MO) anode, the initial water oxidation yields the physisorbed MOx( OH) by reaction (1), which can be subsequently oxidized to the chemically adsorbed "superoxide" MOx+1 by reaction (2) [5][6][7][8][9]: MOx + H2O → MOx( OH) + H+ + e− (1) MOx( OH) → MOx+1 + H+ + e− (2) This is the author's version of a work that was accepted for publication in Electrochimica acta (Ed. Elsevier).Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document.…”

Section: Introductionmentioning

confidence: 99%

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Comparative electrochemical oxidation of methyl orange azo dye using Ti/Ir-Pb, Ti/Ir-Sn, Ti/Ru-Pb, Ti/Pt-Pd and Ti/RuO 2 anodes

Isarain‐Chávez

Baró

Rossinyol

et al. 2017

Electrochimica Acta

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Pd and Ti/RuO2, has been determined from the anodic oxidation (AO) treatment of 2 dm3 of methyl orange azo dye solutions in 0.050 mol dm−3 Na2SO4 of pH 7.0 at constant current density. The anodes were synthesized by the dip-coating method using the corresponding metallic chlorides in isopropanol/water and their morphology, surface roughness, crystallographic structure and composition were analyzed. A mixture of IrO2,Pb2O3 and Pb3O4 were the components in the outperforming Ti/Ir-Pb anode. The effect of current density, Na2SO4 concentration, and cathode nature on the decolorization of azo dye solutions by AO with Ti/RuO2 was examined. Under favorable conditions, 96%-98% color removal was achieved using Ti/Ir-Pb, Ti/Ir-Sn and Ti/Ru-Pb, with lower decolorization for Ti/Pt-Pd and Ti/RuO2 anodes. In all cases, a pseudo-firstorder decolorization process was found. The oxidation ability of anodes rose in the order Ti/RuO2 < Ti/Pt-Pd < Ti/Ru-Pb < Ti/Ir-Sn < Ti/Ir-Pb, achieving 76.0% mineralization for the latter electrode. The mixture of active and non-active materials then gave rise to anodes with higher oxidation power than those made solely of active materials, due to the enhancement of the oxidation action of hydroxyl radicals formed in the non-active oxide. The superiority of Ir over Ru in the mixed metal oxides was related to the greater adsorption of organics on its surface, thereby favoring their oxidation. Ammonium and sulfate ions were released as pre-eminent ion. Stable byproducts and final short-linear aliphatic carboxylic acids were identified by gas chromatography-mass spectrometry and ion-exclusion high-performance liquid chromatography. Based on these compounds, a reaction sequence for methyl orange mineralization is proposed.

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Section: Decolorization Of Methyl Orange Solutions With Ti/ruo2 Anodementioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Comparative electrochemical oxidation of methyl orange azo dye using Ti/Ir-Pb, Ti/Ir-Sn, Ti/Ru-Pb, Ti/Pt-Pd and Ti/RuO 2 anodes

Isarain‐Chávez

Baró

Rossinyol

et al. 2017

Electrochimica Acta

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“…The method of preparation has an effect on the morphological and electrochemical characterization of electrodes. The abovementioned electrodes properly modified reveal the ability to produce reactive species like HO • , RO • , and ROO • radicals as well as O 2− species in situ [10,11] or other reactive species like SO4 -• , Cl • radicals [12], and O 3 , H 2 O 2 and Cl 2 formed in an electrolytic process. These species take part in mineralization of organic pollutants but their formation strongly depends on properties of the electrode materials [10].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical and Corrosion Characterization of TiO2-RuO2/Ti Electrodes Modified with WO3

Kuśmierek

2019

Electrocatalysis

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DSA (dimensionally stable anodes)-type electrodes (TiO 2-RuO 2-WO 3 /Ti) were prepared by the thermal decomposition of proper metal precursor on titanium substrate. Electrochemical and corrosion characteristics of these electrodes were determined in [Fe(CN) 6 ] 3− /[Fe(CN) 6 ] 4− system and Na 2 SO 4 solution with the application of cyclic voltammetry and chronoamperometry. The electrode active surface area and the activity towards oxygen evolution were evaluated. Moreover, corrosion resistance of the tested electrodes was estimated by determination of basic corrosion parameters. The introduction of WO 3 into the oxide layer of the electrodes resulted in a decrease in electrode active surface area and in the number of active sites. The modified electrodes revealed lower activity towards OER but higher activity in organic oxidation. However, their stability was significantly higher in comparison with the non-modified electrode. Corrosion characteristics of the tested electrodes proved the highest corrosion resistance in the case of the electrode modified with 3% WO 3. The modification of TiO 2-RuO 2 /Ti with WO 3 seems to be advantageous in the application in electrochemical and photoelectrochemical degradation of organic pollutants.

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“…Among different candidates, RuO 2 -IrO 2 anodes are considered quite promising anode materials due to their outstanding mechanical stability, long service lifetime and reasonable electrocatalytic activity [9,25,26]. In these systems, the presence of IrO 2 improves the stability of RuO 2 [27,28].…”

Section: Introductionmentioning

confidence: 99%

Improvement of Ti/RuO2–IrO2 Anode Lifetime and Electrocatalytical Properties by Using an Eco-Friendly Thermal Decomposition Method Using Polyvinyl Alcohol as Solvent

Bezerra¹,

Santos²,

Pupo³

et al. 2019

Preprint

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Electrochemical oxidation processes are promising solutions for wastewater treatment due to their high efficiency, easy control and versatility. Mixed metal oxides (MMO) anodes are particularly attractive due to their low cost and specific catalytic properties. Here, we propose an innovative thermal decomposition methodology using <a>polyvinyl alcohol (PVA)</a> as a solvent to prepare Ti/RuO2–IrO2 anodes. Comparative anodes were prepared by conventional method employing a polymeric precursor solvent (Pechini method). The calcination temperatures studied were 300, 400 and 500 °C. The physical characterisation of all materials was performed by X-ray diffraction and scanning electron microscopy coupled with energy dispersive spectroscopy, while electrochemical characterisation was done by cyclic voltammetry, accelerated service lifetime and electrochemical impedance spectroscopy. Both RuO2 and IrO2 have rutile-type structures for all anodes. Rougher and more compact surfaces are formed for the anodes prepared using PVA. Amongst temperatures studied, 300 °C using PVA as solvent is the most suitable one to produce anodes with expressive increase in voltammetric charge (250%) and accelerated service lifetime (4.3 times longer) besides reducing charge-transfer resistance (8 times lower). Moreover, the electrocatalytic activity of the anodes synthesised with PVA toward the Reactive Blue 21 dye removal in chloride medium (100 % in 30 min) is higher than that prepared by Pechini method (60 min). Additionally, the removal total organic carbon point out improved mineralisation potential of PVA anodes. Finally, this study reports a novel methodology using PVA as solvent to synthesise Ti/RuO2–IrO2 anodes with improved properties that can be further extended to synthesise other MMO compositions.

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Electrooxidation of cardanol on mixed metal oxide (RuO2-TiO2 and IrO2-RuO2-TiO2) coated titanium anodes: insights into recalcitrant phenolic compounds

Cited by 51 publications

References 28 publications

Comparative electrochemical oxidation of methyl orange azo dye using Ti/Ir-Pb, Ti/Ir-Sn, Ti/Ru-Pb, Ti/Pt-Pd and Ti/RuO 2 anodes

Comparative electrochemical oxidation of methyl orange azo dye using Ti/Ir-Pb, Ti/Ir-Sn, Ti/Ru-Pb, Ti/Pt-Pd and Ti/RuO 2 anodes

Electrochemical and Corrosion Characterization of TiO2-RuO2/Ti Electrodes Modified with WO3

Improvement of Ti/RuO2–IrO2 Anode Lifetime and Electrocatalytical Properties by Using an Eco-Friendly Thermal Decomposition Method Using Polyvinyl Alcohol as Solvent

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