Electrochemical and photoelectrochemical degradation of direct dyes

Socha, A.; Sochocka, E; Podsiadly, Radosław; Sokołowska, Jolanta

doi:10.1111/j.1478-4408.2006.00027.x

Cited by 48 publications

(27 citation statements)

References 29 publications

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“…Combining equations gives: with 0 ≤ EOI ≤ 1 (17) This relation shows that the specific energy consumption decreases with increasing average current efficiency, reaching a minimum value at EOI = 1. As shown in the previous section, the specific energy consumption for the electrochemical mineralization of organics decreases strongly with increasing average current efficiency (EOI) and reaches a minimum value at EOI = 1.…”

Section: Electrical Energy Consumption In the Electrochemical Mineralmentioning

confidence: 88%

Electrocatalysis in wastewater treatment: recent mechanism advances

Martínez‐Huitle¹,

Andrade²

2011

Quím. Nova

109

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Recebido em 23/9/10; aceito em 4/12/10; publicado na web em 25/3/11Over 50 years, several scientists and industries have developed new alternatives for wastewater treatment and remediation. Recently, electrochemical technology has been largely developed mainly because of its versatility and environmental compatibility. Scientific contributions about role of the electrode material have allowed determining that the influence of material in the selectivity is an important parameter. However, to interpret this behavior, comprehensive physical chemistry models for organics destruction, related to electrochemical phenomena and material surfaces, were proposed in the last decades. So, this paper presents a critical and comprehensive review about the principles and recent mechanism advances in electrocatalysis for wastewater treatment.

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Section: Electrical Energy Consumption In the Electrochemical Mineralmentioning

confidence: 88%

Electrocatalysis in wastewater treatment: recent mechanism advances

Martínez‐Huitle¹,

Andrade²

2011

Quím. Nova

109

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“…Hydroxyl radicals further react with the organics, which results in their degradation [4][5][6]. The anodic material is very important for the electrochemical oxidation processes.…”

Section: Ho2• + H2o2→ •Oh + H2o + O2 Eq (3)mentioning

confidence: 99%

Synthesis and characterization of new Ti–Bi2O3 anode and its use for reactive dye degradation

Petrović

Mitrović

Antonijević

et al. 2015

Materials Chemistry and Physics

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This paper reports the synthesis, characterization and application of a Ti-Bi2O3 anode for the electrochemical decolorization of the textile dye Reactive Red 2. The anode was synthesized by electrodeposition on a Ti substrate immersed in an acidic bismuth (III) solution at constant potential, followed by calcination in air at 600°C. Thermogravimetric Analysis (TGA), Energydispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD) analysis revealed that the electrodeposited material was predominantly metallic bismuth, which was oxidized to pure α-Bi2O3 during the calcination in air. SEM micrographs revealed that the Bi2O3 coat at the anode surface was inhomogeneous and porous. Reactive Red 2 was completely electrochemically decolorized at the synthesized anode in the presence of H2O2. The applied current density, H2O2 and Na2SO4 concentration, medium pH and initial dye concentration affected the dye decolorization rate. The optimal process parameters were found to be as follows: an applied current density of 40 mA cm -2 using a mixture of 10 mmol dm -3 H2O2 and 10 mmol dm -3 Na2SO4 at pH 7. The dye decolorization rate was shown to decrease as its initial concentration increased. The decolorization reactions were found to follow pseudo-first order kinetics.

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“…Electrochemical oxidation of organic with conductivediamond anodes is not limited by electrode processes, an enhancement in the efficiency is only expected if homogeneous catalytic processes are promoted [14,[16][17][18]30]. As is well known, the use of conductive diamond anodes allows for the production of many types of oxidants [31][32][33][34][35], including H 2 O 2 , O 3 (Eqs.…”

Section: Introductionmentioning

confidence: 98%

“…Furthermore, to improve the efficiency of this process, in which typically POPs concentrations are very low, scientific efforts have been focused on the combination of anodic oxidation with other processes such as oxidant production. In this respect, ultraviolet light ultraviolet (UV) or ultrasonic (US) radiation [12][13][14][15][16][17][18][19][20][21][22][23] can help expand the applicability of electrochemical technology used to treat concentrated wastewater (typically industrial effluents) to the removal of organics in diluted flows (such as the removal of POPs from urban treated wastewater) [24,25].…”

Section: Introductionmentioning

confidence: 99%

Irradiation-assisted electrochemical processes for the removal of persistent organic pollutants from wastewater

et al. 2015

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This work focused on the removal of persistent organic pollutants (POPs) from wastewater using irradiation-assisted electrochemical technologies, i.e. sonoelectrolysis, photoelectrolysis and sono-photoelectrolysis. Single-irradiation processes (sonolysis and photolysis) and electrochemical oxidation using conductive diamond anodes (current density of 30 mA cm -2 ) were also evaluated for comparison. Three POPs with different molecular structures (sulfamethoxazole, metoprolol and caffeine, initial concentration of 100 mg dm -3 ) were studied to evaluate the robustness of the selected technologies and the oxidation mechanisms involved in each case. Results show that the single application of the irradiation technologies led to the removal of only a small amount of POPs and no mineralisation, with the nature of the pollutant showing a marked effect; the opposite was observed for the single application of conductive diamond electrochemical oxidation (CDEO), which is a highly robust and efficient technology for the degradation of all types of POPs. Sonoelectrolysis, photoelectrolysis and sono-photoelectrolysis processes (ultrasound conditions: 200 W, ultraviolet conditions: 254 nm, 4 W) may show synergistic, antagonistic or nil effects with respect to a single electrochemical oxidation event, depending on the nature of the treated molecule. The differences observed may be related to the different chemical nature of the organic species studied, indicating an important role of mediated oxidation processes, which may be enhanced with ultrasounds and ultraviolet radiation techniques.

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Electrochemical and photoelectrochemical degradation of direct dyes

Cited by 48 publications

References 29 publications

Electrocatalysis in wastewater treatment: recent mechanism advances

Electrocatalysis in wastewater treatment: recent mechanism advances

Synthesis and characterization of new Ti–Bi2O3 anode and its use for reactive dye degradation

Irradiation-assisted electrochemical processes for the removal of persistent organic pollutants from wastewater

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