Electrochemical combustion of indigo at ternary oxide coated titanium anodes

León, María I.; Aguilar, Zaira G.; Nava, José L.

doi:10.5599/jese.2014.0061

Cited by 9 publications

(14 citation statements)

References 22 publications

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“…(i) The FM01-LC behaves as a flow-by electrochemical reactor in which the production of H 2 O 2 from reaction (1) and the regeneration of Fe 2+ from reaction (3) occur at the GF, whereas the massive O 2 evolution reaction (OER) takes place in the platinized Ti anode. In the model, the mineralization of ERY, and formed by-products and intermediates within the reactor are neglected because: (a) heterogeneous M( OH) radicals are not formed at the anode due to the low j used [58], and (b) the contribution by H 2 O 2 is very small compared to SPEF reactions [59]. The later assumption is also considered owing to the very short residence times in the FM01-LC at the flow rates applied (0.56 < t < 0.91 s).…”

Section: Mathematical Model For Spef Treatment Of Organics In a Flow mentioning

confidence: 99%

Solar photoelectro-Fenton flow plant modeling for the degradation of the antibiotic erythromycin in sulfate medium

Pérez¹,

Sirés²,

Brillas³

et al. 2017

Electrochimica Acta

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A solar photoelectro-Fenton (SPEF) plant containing a filter-press FM01-LC flow reactor in series with a compound parabolic collector (CPC) as photoreactor, operating in batch recirculation mode, was simulated using a parametric model. The degradation of 10 dm 3 of solutions of the heterocyclic antibiotic erythromycin (ERY) in 0.050 mol dm −3 Na 2 SO 4 at pH 3.0 was used for validation. The filter-press reactor contained a platinized titanium plate anode and a graphite-felt cathode that produced H 2 O 2 from the reduction of dissolved oxygen (0.24 mmol dm −3). Trials were performed under potentiostatic and galvanostatic conditions with predominance of H 2 O 2 production, minimizing H 2 evolution reaction. The effect of initial catalyst (Fe 2+) concentration, current density (j), initial antibiotic concentration as dissolved organic carbon (DOC) and volumetric flow rate on the ERY mineralization was studied. Good agreement between simulations and experimental DOC decays was obtained. Mineralization current efficiencies and specific energy consumptions were also determined. The best performance under galvanostatic conditions was found for 0.225 mmol dm −3 ERY (100 mg dm −3 DOC), 0.50 mmol dm −3 Fe 2+ , volumetric flow rate of 3.0 dm 3 min −1 and j cath = 0.16 mA cm −2 , reaching 69% mineralization with current efficiency of 75% and specific energy consumption of 0.059 kWh (g DOC) −1. Six organic by-products were identified by gas chromatography-mass spectrometry, whereas final short-chain carboxylic acids like formic and oxalic acid were detected by ion-exclusion high-performance liquid chromatography. The initial N atom of ERY was predominantly converted into NO 3 − ion, although NH 4 + ion was formed as well.

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Section: Mathematical Model For Spef Treatment Of Organics In a Flow mentioning

confidence: 99%

Solar photoelectro-Fenton flow plant modeling for the degradation of the antibiotic erythromycin in sulfate medium

Pérez¹,

Sirés²,

Brillas³

et al. 2017

Electrochimica Acta

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“…Although their primary application has been recognized in the chlor-alkali industry [1], they are widely used for the degradation of persistent organic pollutants (POPs) in water [2][3][4][5][6][7][8][9][10][11][12][13][14][15]. These works highlighted that mixed metal oxides (MMO) supported on either titanium or niobium substrates represent one of the most important categories of electrocatalysts [4][5][6][7][8][9][10][11][13][14][15]. In recent years, electrochemical advanced oxidation processes (EAOPs) using pure metal anodes like Pt, metal oxides (MO) such as PtO, IrO 2 , RuO 2 , SnO 2 and PbO 2 , and MMO like SnO 2 -Sb 2 O 5 , TiO 2 -SnO 2 and IrO 2 -SnO 2 -Sb 2 O 5 , among others, have been investigated in detail for environmental preservation [13,16].…”

Section: Introductionmentioning

confidence: 99%

“…However, the high cost of BDD anodes has limited its use to small devices. Hence, the design and synthesis of much less expensive MMO anodes is now attracting a lot of attention [4,[6][7][8][9][10]14,15]. The preparation of an ideal MMO electrode must guarantee its high oxidation ability, chemical and mechanical stability based on an adequate service life, and low cost.…”

Section: Introductionmentioning

confidence: 99%

Ti|Ir–Sn–Sb oxide anode: Service life and role of the acid sites content during water oxidation to hydroxyl radicals

Aguilar

Coreño

Salazar

et al. 2018

Journal of Electroanalytical Chemistry

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This work describes the preparation of four Ti|Ir-Sn-Sb oxide anodes by the Pechini method under different conditions and the evaluation of their service life, envisaging a future application in electrochemical advanced oxidation processes for water treatment. This was estimated by means of accelerated life tests (1 A cm-2 , 1 M HClO4), which highlighted the dependence of durability on the Ir and Sn content in the mixed metal oxide (MMO) as well as on the required heat treatment time for its preparation. The best MMO anode reached up to 351 h of service life under such extreme conditions. SEM-EDS and XRD analyses were performed before and after the accelerated life tests, evidencing that the failure of the MMO coatings occurred by detachment from the titanium substrate, thus losing the anode electroactivity. Great amounts of acid sites in the range 0.21-0.26 meq g-1 were determined on the MMO surfaces by Boehm titrations. From the apparent rate constants determined for the decay of N,N-dimethyl-4-nitrosoaniline used as spin trap, before and after acid sites neutralization, a higher activity of adsorbed hydroxyl radicals at the MMO surface cannot be correlated with a greater amount of acid sites. The results obtained suggest that other active sites affect the formation of such radicals from water discharge.

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“…This general description is valid when the EO treatment is performed in the presence of anions like ClO 4 − , NO 3 − and SO 4 2− , which remain stable during the electrolysis or become a source of weak oxidants, e.g., S 2 O 8 2− at the BDD surface [31,32]. In contrast, the EO process becomes much more complex in the presence of Cl − because it can be oxidized to active chlorine (Cl 2 , HClO and/or ClO − ) via Reactions (2)- (4), which competes with M( OH) to attac cules [1,4,[21][22][23]26,37,38].…”

Section: Introductionmentioning

confidence: 99%

“…To give evidence of the upgrading of azo dye removal under EF-like and PEF-like conditions, we have undertaken a study on the degradation of Acid Yellow 36 in acidic chlorinated solutions using a purpose-made Ir-Sn-Sb oxide anode with ability to produce M( OH) radicals and active chlorine [38,42]. Acid Yellow 36 (also known as Metanil Yellow, see physicochemical properties in Table 1) has been chosen as model azo dye because it is present in wastewater from tex tile, tannery, paper and cosmetic industries, among others.…”

Section: Introductionmentioning

confidence: 99%

Evidence of Fenton-like reaction with active chlorine during the electrocatalytic oxidation of Acid Yellow 36 azo dye with Ir-Sn-Sb oxide anode in the presence of iron ion

Aguilar

Brillas

Salazar

et al. 2017

Applied Catalysis B: Environmental

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The degradation of 2.5 L of Acid Yellow 36 solutions at pH 3.0 by electro-oxidation (EO) has been studied in a flow plant with a reactor containing an Ir-Sn-Sb oxide anode and a stainless steel cathode. The anode was prepared onto Ti by the Pechini method and characterized by SEM-EDX and XRD. It showed a certain ability to electrocatalyze both, the generation of adsorbed OH from water oxidation in sulfate medium and, more largely, the production of active chlorine in a mixed electrolyte containing Cl − ion. The EO treatment of the dye solution in the latter medium led to a rapid decolorization because active chorine destroyed the colored by-products formed, but color removal was much slower in pure NaClO 4 or Na 2 SO 4 due to the limited formation of OH. In contrast, greater mineralization was obtained in both pure electrolytes since the by-products formed in the presence of Cl − became largely persistent. The effect of liquid flow rate, current density and dye content on the EO performance in the mixed electrolyte was examined. The drop of absorbance and dye concentration obeyed a pseudo-first-order kinetics. Interestingly, the decolorization rate, dye concentration decay and TOC removal were enhanced upon catalysis with 1.0 mM Fe 2+. Such better performance can be accounted for by the formation of OH in the bulk from the electro-Fenton-like reaction between electrogenerated HClO and added Fe 2+. Even larger mineralization was achieved by the photoelectro-Fenton-like process upon irradiation of the solution with UVA light due to photolysis of some refractory intermediates. Maleic and acetic acids were detected as final short-chain linear carboxylic acids. The loss of Cl − and the formation of ClO 3 − , ClO 4 − , SO 4 2− , NO 3 − and NH 4 + were evaluated as well.

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Electrochemical combustion of indigo at ternary oxide coated titanium anodes

Cited by 9 publications

References 22 publications

Solar photoelectro-Fenton flow plant modeling for the degradation of the antibiotic erythromycin in sulfate medium

Solar photoelectro-Fenton flow plant modeling for the degradation of the antibiotic erythromycin in sulfate medium

Ti|Ir–Sn–Sb oxide anode: Service life and role of the acid sites content during water oxidation to hydroxyl radicals

Evidence of Fenton-like reaction with active chlorine during the electrocatalytic oxidation of Acid Yellow 36 azo dye with Ir-Sn-Sb oxide anode in the presence of iron ion

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