Direct electrochemical degradation of organic wastes in aqueous media

Johnson, Dennis C.; Feng, Jianren; Houk, Linda L.

doi:10.1016/s0013-4686(00)00588-0

Cited by 143 publications

(57 citation statements)

References 21 publications

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“…25,28 Typical layers employed in the elimination of organic compounds have this characteristic, for example, SnO 2 or PbO 2 . 1,11,23,29 The introduction of platinum in the oxide layer decreases the overpotential for OER and, therefore, the electrocatalytic performance in organic oxidation decreases according to the increase of "active" sites for hydroxyl radicals. 25 In fact, the electrodes containing platinum ͑13 atom %͒ have a lower efficiency for elimination of phenol, in good agreement with the presence of a higher concentration of chemisorbed OH · radicals.…”

Section: B423mentioning

confidence: 99%

Evaluation of the Electrocatalytic Activity of Antimony-Doped Tin Dioxide Anodes toward the Oxidation of Phenol in Aqueous Solutions

Montilla

Morallón

Vázquez

2005

J. Electrochem. Soc.

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Antimony-doped tin dioxide electrodes supported on titanium have been used in the electrochemical treatment of aqueous solution containing phenol. Ti/SnO 2 -Sb anode has high efficiency in the elimination of phenol, but its use is hindered by its short service life. The introduction of platinum in the oxide layer ͑3 or 13 atom %͒ increases the electrode service life up to two orders of magnitude. The electrocatalytic activity of the electrodes toward phenol oxidation has been analyzed with respect to the amount of platinum in the electrode composition. Voltammetric studies show that the oxidation potential of phenol decreases with the amount of platinum in the oxide layer. The activity for phenol oxidation per electroactive site is higher with the Sb-doped SnO 2 electrode within the zone of electrochemical stability of the solvent. Galvanostatic electrolysis of phenol solutions was performed analyzing several factors that affect the efficiency of the elimination process, such as anode composition, cell design, current density, and phenol concentration. The electrode containing platinum ͑3 atom %͒ presents the highest efficiency for phenol removal, even higher than Sb-doped SnO 2 .

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Section: B423mentioning

confidence: 99%

Evaluation of the Electrocatalytic Activity of Antimony-Doped Tin Dioxide Anodes toward the Oxidation of Phenol in Aqueous Solutions

Montilla

Morallón

Vázquez

2005

J. Electrochem. Soc.

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“…The rate of colour and organic load removal depends, among other variables, on the anode's material and the working potential. Several anode materials, with different experimental conditions, have been successfully used in the electro-degradation of hazardous compounds [7][8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Degradation of a Textile Dye C. I. Direct Red 80 by Electrochemical Processes

Lopes¹,

Martins²,

Morão³

et al. 2004

Port. Electrochim. Acta

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The electrochemical removal of the textile dye C. I. Direct Red 80 (DR80) was carried out using three different materials as anodes: iron, polypyrrole (PPy) and boron doped diamond (BDD). Iron electrodes are consumed during the electrolysis, and promote flocculation/coagulation of the dye. Polypyrrole, a conducting polymer, was prepared by chemical/electrochemical precipitation over a cotton cloth; it enables the precipitation of the dissolved dye through a conversion reaction in a less soluble compound. Boron doped diamond electrode was used to achieve the complete mineralization of the dye. Bulk electrolysis were studied using Na 2 SO 4 as electrolyte. In the case of the PPy electrode, NH 4 NO 3 was also used as electrolyte. The variation of the dye concentration was followed by UV-visible absorbance measurements and chemical oxygen demand (COD) tests were also performed, to compare the rates of colour and COD removal in each case. From the COD measurements over the time of electrolysis, using the BDD anode, a mass transfer coefficient for the DR80 molecule was determined. The obtained results show an almost complete colour removal for all the electrodes tested and a COD removal between 50 and 90 %, being the best results obtained with the BDD electrode.

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“…Among them, Lead dioxide (PbO 2 ) has attracted considerable attentions owing to its excellent electrochemical performance and lower cost. 11 Lead dioxide electrode has already been used in electrowinning process, 12 waste water treatment, 13,14 ozone generation, 15,16 batteries [17][18][19] and analytical sensors. 20 The pure lead dioxide prepared by electrodeposition was demonstrated to exhibit a moderate electrocatalytic activity towards various anodic reactions in acidic media.…”

Section: Introductionmentioning

confidence: 99%

Study on the Electrosynthesis of Pb-0.3%Ag/α-PbO<sub>2</sub> Composite Inert Anode Materials

Ren-ping

et al. 2015

Electrochemistry

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An α-PbO 2 layer were synthesized on the Pb-0.3%(mass proportion)Ag alloy substrates by constant current electrosynthesis from an alkaline solution, and Pb-0.3%Ag/α-PbO 2 composite inert anode materials were obtained. An electrochemical investigation of α-PbO 2 deposition process on the Pb-0.3%Ag alloy substrates, using anodic polarization technique, galvanostatic polarization technique and steady state polarization technique, has been carried out. The phase composition and surface microstructures of α-PbO 2 layers in different synthesizing times were tested by means of XRD and SEM, respectively. The experimental data have shown that the process of α-PbO 2 formation on Pb-0.3%Ag alloy substrates have several stages. The optimized conditions can be effectively improving the formation rate of α-PbO 2 and avoid the occurrence of oxygen evolution reaction. The α-PbO 2 deposition layer obtained in alkaline solution possesses compact structure, and it is composed of well developed spherical grains.

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Direct electrochemical degradation of organic wastes in aqueous media

Cited by 143 publications

References 21 publications

Evaluation of the Electrocatalytic Activity of Antimony-Doped Tin Dioxide Anodes toward the Oxidation of Phenol in Aqueous Solutions

Evaluation of the Electrocatalytic Activity of Antimony-Doped Tin Dioxide Anodes toward the Oxidation of Phenol in Aqueous Solutions

Degradation of a Textile Dye C. I. Direct Red 80 by Electrochemical Processes

Study on the Electrosynthesis of Pb-0.3%Ag/α-PbO<sub>2</sub> Composite Inert Anode Materials

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Direct electrochemical degradation of organic wastes in aqueous media

Cited by 143 publications

References 21 publications

Evaluation of the Electrocatalytic Activity of Antimony-Doped Tin Dioxide Anodes toward the Oxidation of Phenol in Aqueous Solutions

Evaluation of the Electrocatalytic Activity of Antimony-Doped Tin Dioxide Anodes toward the Oxidation of Phenol in Aqueous Solutions

Degradation of a Textile Dye C. I. Direct Red 80 by Electrochemical Processes

Study on the Electrosynthesis of Pb-0.3%Ag/&alpha;-PbO<sub>2</sub> Composite Inert Anode Materials

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Study on the Electrosynthesis of Pb-0.3%Ag/α-PbO<sub>2</sub> Composite Inert Anode Materials