Electrochemical treatment of phenolic waters in presence of chloride with boron-doped diamond (BDD) anodes: Experimental study and mathematical model

Mascia, Michele; Vacca, Annalisa; Polcaro, Am; Palmas, Simonetta; Ruiz, J. Rodriguez; Pozzo, Anna Da

doi:10.1016/j.jhazmat.2009.09.053

Cited by 99 publications

(46 citation statements)

References 33 publications

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“…For an effective mass transport of organics to the electrode surface, hydrodynamics providing turbulent conditions are often demanded for high faradaic yield (Mascia et al, 2010;Cordeiro et al, 2013). On the contrary, laminar flow in the cell could potentially minimize the DI formation.…”

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confidence: 99%

“…On the contrary, laminar flow in the cell could potentially minimize the DI formation. Results indicating this hypothesis were found by Mascia et al (2010), although not highlighted because focus was on the overall rate of removal, which typically is the standard evaluation parameter. The reason for the lower amounts of DIs at laminar flow may be that under these conditions the transport of DIs from surface to bulk will primarily be diffusive.…”

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confidence: 99%

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Study of degradation intermediates formed during electrochemical oxidation of pesticide residue 2,6-dichlorobenzamide (BAM) at boron doped diamond (BDD) and platinum–iridium anodes

2014

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confidence: 99%

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confidence: 99%

Study of degradation intermediates formed during electrochemical oxidation of pesticide residue 2,6-dichlorobenzamide (BAM) at boron doped diamond (BDD) and platinum–iridium anodes

2014

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“…When pH is greater than 8, main form of chlorine is ClO − . As the oxidizing ability of HClO (E θ =1.5 V) is stronger than ClO − (E θ =0.89 V), ARB is easy to mineralize in an acidic or neutral condition [31]. Another reason is that Na + can combine with ClO − to inhibit the oxidation of ARB [32].…”

Section: Effect Of Initial Phmentioning

confidence: 99%

Electrocatalytic activity of Ce-PbO2/C anode for acid red B reduction in aqueous solution

Yang

2015

J Solid State Electrochem

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Graphite-lead dioxide electrodes doped with rare earth Cerium (Ce-PbO 2 /C electrodes) were prepared by electrodeposition. The scanning electron microscope results showed that the microstructure and crystal orientation of electrode surface were changed by Cerium doping. CeO 2 was detected from modified electrodes by X-ray diffraction analysis. The cyclic voltammetry spectra indicated that the oxidation peak potential of cerium-doped electrode was smaller than pure PbO 2 electrode. Effects of the novel electrode on acid red B degradation were evaluated systematically under different parameters, including applied voltage, initial pH, supporting electrolyte concentration, electrode spacing, and influent concentration. The results indicated that chemical oxygen demand, decolorization, and ammonia nitrogen removal rate of Ce-PbO 2 /C electrodes reached 90.17, 99.98, and 97.23 %, respectively, after 60-min electrolysis at initial 1000 mg L −1 acid red B concentration. The possible mechanism of acid red B degradation over Ce-PbO 2 /C electrodes was monitored by gas chromatography-mass spectrometer.

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“…[31] and Mascia et al [41] proposed models that describe the oxidation of organics not only by means of hydroxyl radicals near the anode surface, but also in the bulk by means of electrogenerated oxidants, i.e. : active chlorine and hydrogen peroxide.…”

Section: Theorymentioning

confidence: 99%

Remediation of wastewaters containing tetrahydrofuran. Study of the electrochemical mineralization on BDD electrodes

Urtiaga

Fernández-Castro

Gómez

et al. 2014

Chemical Engineering Journal

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This work contributes to the development of electro-oxidation on commercial boron doped diamond (BDD) anodes as an efficient and versatile environmental technology to deal with remediation of tetrahydrofuran (THF) polluted industrial wastewaters.Working with an undivided flow-by electrochemical cell, a systematic experimental study has been carried out to analyze the influence of the following operation variables: i) initial THF concentrations in the range 500-1100 mg/L ii) supporting electrolyte, Na 2 SO 4 and NaCl and iii) current density in the range 300-1200 A/m 2 . The performance of the oxidation process was assessed through the change in the concentration of THF, chemical oxygen demand (COD), and total organic carbon (TOC) being the current density the variable that exerted the most positive kinetic influence; more precisely the reduction of COD after 60 minutes changed from 40 % at j app = 300 A/m 2 to 95.5 % at j app =1200 A/m 2 , whereas the reductions of TOC were typically higher than 95 % for a value of the specific charge of Q=10 A/hL. Besides, THF oxidation products have been analyzed, and the reactions' pathway are proposed.Finally, the formation of chloride by-products, such as perchlorate was assessed observing that it was hindered at low current densities. In the view of these findings, it is concluded that THF oxidation on BDD anodes should be better performed at low current densities, i.e. 300 A/m 2 for the type of wastewaters analyzed in the present work, to reach a compromise between effective degradation and the formation of undesirable chlorinated by-products.

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Electrochemical treatment of phenolic waters in presence of chloride with boron-doped diamond (BDD) anodes: Experimental study and mathematical model

Cited by 99 publications

References 33 publications

Study of degradation intermediates formed during electrochemical oxidation of pesticide residue 2,6-dichlorobenzamide (BAM) at boron doped diamond (BDD) and platinum–iridium anodes

Study of degradation intermediates formed during electrochemical oxidation of pesticide residue 2,6-dichlorobenzamide (BAM) at boron doped diamond (BDD) and platinum–iridium anodes

Electrocatalytic activity of Ce-PbO2/C anode for acid red B reduction in aqueous solution

Remediation of wastewaters containing tetrahydrofuran. Study of the electrochemical mineralization on BDD electrodes

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