Mediated electrochemical oxidation of phenol in continuous feeding mode using Ag (II) and Ce (IV) mediator ions in nitric acid: A comparative study

Matheswaran, Manickam; Balaji, S.; Chung, Sung Pil; Moon, Ilkyeong

doi:10.1016/j.cej.2008.01.005

Cited by 28 publications

(22 citation statements)

References 25 publications

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“…The application of electrochemical oxidation methods for the treatment of pollutants has been attracted much more interest since it uses a clean reagent 'the electron'. The methods can be employed in oxidation of many different types of organic substrates [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15], recirculation of spent Cr-etching solutions containing high concentrations of Cr(III) [16,17], removal of hydrogen sulfide from the atmosphere [18], removal of SO 2 and NOx from waste gases [19]. The electrochemical treatment of organic and inorganic substrates could be carried out by direct electrochemical oxidation (DEO) or mediated electrochemical oxidation (MEO), such as the degradation of phenol [1,[3][4][5], ␤-dicarbonyl [6], aromatic derivatives [7], EDTA [10,11], pesticides [15] and removal of H 2 S/NO 2 [18,19].…”

Section: Introductionmentioning

confidence: 99%

A simple modeling study of the Ce(IV) regeneration in sulfuric acid solutions

Ren¹,

Wei²

2011

Journal of Hazardous Materials

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Section: Introductionmentioning

confidence: 99%

A simple modeling study of the Ce(IV) regeneration in sulfuric acid solutions

Ren¹,

Wei²

2011

Journal of Hazardous Materials

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“…The oxidation of phenol has been performed in electrochemical flow cells via Ce(IV) oxidation in nitric acid solutions [156,157], showing nearly 300% increase in efficiency in comparison to direct oxidation. Compared to Ag(II), the cerium mediated process required higher temperatures and showed 5% lower efficiency [158]. Batch destruction of EDTA was also performed in batch and continuous modes, following the concentration decay with a mathematical model [159,160], and its operating conditions studied towards optimization [161,162].…”

Section: Destruction Of Organicsmentioning

confidence: 99%

Electrochemical redox processes involving soluble cerium species

Arenas

León

Walsh

2016

Electrochimica Acta

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Anodic oxidation of cerous ions and cathodic reduction of ceric ions, in aqueous acidic solutions, play an important role in electrochemical processes at laboratory and industrial scale. Ceric ions, which have been used for oxidation of organic wastes and off-gases in environmental treatment, are a wellestablished oxidant for indirect organic synthesis and specialised cleaning processes, including oxide film removal from tanks and process pipework in nuclear decontamination. They also provide a classical reagent for chemical analysis in the laboratory. The reversible oxidation of cerous ions is an important reaction in the positive compartment of various redox flow batteries during charge and discharge cycling. A knowledge of the thermodynamics and kinetics of the redox reaction is critical to an understanding of the role of cerium redox species in these applications. Suitable choices of electrode material (metal or ceramic; coated or uncoated), geometry/structure (2-or 3-dimensional) and electrolyte flow conditions (hence an acceptable mass transport rate) are critical to achieving effective electrocatalysis, a high performance and a long lifetime. This review considers the electrochemistry of soluble cerium species and their diverse uses in electrochemical technology, especially for redox flow batteries and mediated electrochemical oxidation.

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“…The experiments were carried out between 90 and 95 8C and at atmospheric pressure. This system has been used by our group to successfully mineralize several model compounds, such as ethylenediaminetetraacetic acid (EDTA), phenol, benzoquinone, hydroquinone, catechol, maleic acid and oxalic acid via a cerium-MEO process, as listed in Table 3, either in batch and continuous mode [34,49,67,[126][127][128][129][130].…”

Section: Metallic Redox Couplesmentioning

confidence: 99%