Electrochemical oxidation of RB-19 dye using a highly BDD/Ti: Proposed pathway and toxicity

Vasconcelos, Vanessa M.; Migliorini, Fernanda L.; Steter, Juliana R.; Baldan, Maurício Ribeiro; Ferreira, N.G.; Lanza, Marcos R.V.

doi:10.1016/j.jece.2016.08.029

Cited by 38 publications

(12 citation statements)

References 45 publications

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“…Reactive Blue 19 (RB‐19) is a commercially available anthraquinone reactive dye. The major intermediates of RB19 degradation and the degradation route have been extensively studied in the past decades (Bilal et al, ; Fanchiang & Tseng, ; He et al, ; Siddique, Farooq, & Shaheen, ; Vasconcelos et al, ; Xie et al, ). In this study, the oxidation intermediate compounds of RB19 were identified through LC‐MS and GC‐MS analyses.…”

Section: Resultsmentioning

confidence: 99%

A low‐voltage pulse electrolysis method for the degradation of anthraquinone and azo dyes in chloride medium by anodic oxidation on Ti/IrO₂‐RuO₂‐SnO₂ electrodes

Chao

Xue

Jiang

et al. 2019

Water Environment Research

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Wastewater produced by the textile industry containing azo dyes and anthraquinone dyes is significant source of pollution to the environment and is toxic for aquatic life. To overcome the high-energy cost of traditional electrochemical oxidation, a custom-built power supply device for the degradation of anthraquinone and azo dyes by low voltage of 15.0-20.0 V pulsed discharge was investigated. Titanium coated with mixed oxide (Ti/IrO 2 -RuO 2 -SnO 2 ) plates and pure titanium plates were used as the anode and cathode, respectively, for the generation of chlorine in the dye solution. For the anthraquinone dye Reactive Blue 19, 60.0% of the chemical oxygen demand (COD) and 22.0% of the total organic carbon (TOC) were removed using this system. A comparison of the direct current electrolysis and pulsed discharge revealed that using the pulsed discharge method reduced the energy cost by 68.6%. UV-visible, LC-MS, and GC-MS were used to identify the intermediate compounds formed during the degradation of Reactive Blue 19. The results indicate that in the process of oxidation by chlorine/hypochlorite, the chromophore group was first oxidized to -NH 2 , followed by decolorization via chlorination of the aromatic rings. The results confirm that low-voltage pulse electrolysis can be used for the degradation of industrial dyes in waste effluents. © 2019 Water Environment Federation • Practitioner points• Low-voltage pulse electrolysis can be used for the degradation of industrial dyes and/or dyes in waste effluents. • For anionic dye Reactive Blue 19, 60.0% of COD and 22.0% of TOC were removed using low-voltage (20.0 V) pulse electrolysis. • The pulsed discharge method reduced the energy cost of this degradation process by 68.6% compared with direct current electrolysis. • The intermediate compounds formed during the degradation of Reactive Blue 19 were confirmed by UV-visible spectroscopy, LC-MS, and GC-MS.

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Section: Resultsmentioning

confidence: 99%

A low‐voltage pulse electrolysis method for the degradation of anthraquinone and azo dyes in chloride medium by anodic oxidation on Ti/IrO₂‐RuO₂‐SnO₂ electrodes

Chao

Xue

Jiang

et al. 2019

Water Environment Research

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“…It is more difficult to remove TOC than decolourise the RB-19 dye because during the electrodegradation there is the formation of stable by-products such as aminoanthraquinone, tautomers keto-enolic, hydroquinone and benzoquinone, benzoic acid, and acid aliphatic, such as oxalic acid. [21] Only 27 % of TOC was removed at lower current density (4 mA cm À 2 ) during 90 min electrolysis but in general Table 1 shows that TOC removal improves with the current densities and with longer time of electrolyses.…”

Section: Direct Degradation Of Rb-19mentioning

confidence: 94%

“…[19] The energy consumption values were not reported by the authors. Vasconcelos et al [21] reported 37 % of TOC removal of RB-19 dye after 120 min of electrolysis with an energy consumption value of 585 kWh kg À 1 . Compared to these values the present work reports high percentage of TOC removal with lower energy consumption.…”

Section: Direct Degradation Of Rb-19mentioning

confidence: 99%

“…Andrade et al [20] studied the electroxidation of 25 mg dm À 3 RB-19 dye in a one-compartment filter-press electrochemical reactor fitted with DBB/Nb (anode electrode) and nickel sheet (cathode electrode), when 50 mA cm À 2 was applied, 90 % decolourisation was achieved after 10 min and 82 % of TOC was removed in 2 h. The electrolyte was 0.5 mol dm À 3 of Na 2 SO 4 at 25°C and the volumetric flow rate was 2.4 dm 3 h À 1 . Vasconcelos et al [21] reported the RB-19 degradation using a highly noncommercial BDD/Ti (4.15 cm 2 with B/C ratio of 15,000 ppm, a doping boron level of around 10 19 cm 3 ) in a one compartment electrochemical cell and Pt as cathode electrode. Applying 100 mA cm À 2 , total colour removal was achieved in 40 min and 99 % of TOC removal was attained in 8 h with significant decrease in toxicity against Vibrio fischeri bioluminescent bacteria.…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical Degradation of Reactive Blue 19 Dye by Combining Boron‐Doped Diamond and Reticulated Vitreous Carbon Electrodes

et al. 2019

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Reactive Blue 19 (RB‐19) dye has a low fixation efficiency, a long half‐life and high toxicity. It is easily loss during the cleaning of textiles and can remain in the environment for a long time, causing serious environmental problems if not removed. This study reports the degradation of RB‐19 by: 1) direct electrochemical degradation with boron‐doped diamond (BDD) electrodes and 2) combined processes using BDD and reticulated vitreous carbon (RVC) electrodes that generate H2O2. The direct degradation uses different current densities and concentrations. High currents densities, longer electrolysis times and low volumetric flow rates favour RB‐19 degradation, removing total colour and 100 % TOC after 5 and 60 min, respectively. At a current density of 41 mA cm−2 and a volumetric flow rate of 20 dm3 h−1, the energy consumption to degrade 20 mg dm−3 of RB‐19 was 279 kWh kg−1. The TOC removal of RB‐19 dye combining BDD and RVC at a current density of 41 mA cm−2 was below 72 % after 90 min and the energy consumption increased to 612 kWh kg−1. The higher energy consumption observed during the combined process suggests that the direct degradation process at low volumetric flow rates is more efficient than the combined process.

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“…Electrochemical oxidation, a member of the family of advanced oxidation processes (AOPs), 1-3 is widely utilized in environmental fields. 4,5 In recent years, increasing attention has been focused on the application of electrochemical oxidation in effective decomposition of persistent organic matter pollutants such as pesticides, 6,7 textile dyes [8][9][10] and pharmaceutical products. 1,11 Electrodes -the core of this technology -determine the process of electrochemical oxidation.…”

Section: Introductionmentioning

confidence: 99%

Preparation, characterization and environmental application of the composite electrode TiO₂‐NTs/SnO₂—Sb with carbon aerogels

Liu

Chen

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND Research on electrode materials with high electrochemical activity is of great importance for the electrochemical oxidation technique. In this work, an electrode comprising titanium dioxide nanotubes with tin oxide antimony (TiO2‐NTs/SnO2—Sb) with carbon aerogels (TSS‐CAs) was fabricated and used to degrade three isomers of dihydroxybenzenes. RESULTS It was observed that the TSS‐0.5%CAs electrode prepared with 0.5 wt% CAs possessed prominent pore structure and a larger specific surface area of 180.83 m2 g−1. Electrochemical measurements revealed that the TSS‐0.5%CAs electrode had enhanced electrochemical activity, larger electroactive area, and higher oxygen evolution potential. Relevant operational parameters including initial contaminant concentration, pH, electrolyte concentration and current density had significant effects on the electrocatalytic performance of the TSS‐CAs electrode. CONCLUSION It was demonstrated that a proper content of carbon aerogel could improve the structure and electrochemical performance of the TSS‐CAs electrode. The removal of catechol was higher than that of hydroquinone and resorcinol during electrochemical oxidation, due to its lower Gibbs free energy barriers. Oxidation of intermediates of dihydroxybenzenes by the TSS‐CAs electrode also was confirmed. © 2019 Society of Chemical Industry

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Electrochemical oxidation of RB-19 dye using a highly BDD/Ti: Proposed pathway and toxicity

Cited by 38 publications

References 45 publications

A low‐voltage pulse electrolysis method for the degradation of anthraquinone and azo dyes in chloride medium by anodic oxidation on Ti/IrO₂‐RuO₂‐SnO₂ electrodes

A low‐voltage pulse electrolysis method for the degradation of anthraquinone and azo dyes in chloride medium by anodic oxidation on Ti/IrO₂‐RuO₂‐SnO₂ electrodes

Electrochemical Degradation of Reactive Blue 19 Dye by Combining Boron‐Doped Diamond and Reticulated Vitreous Carbon Electrodes

Preparation, characterization and environmental application of the composite electrode TiO₂‐NTs/SnO₂—Sb with carbon aerogels

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Electrochemical oxidation of RB-19 dye using a highly BDD/Ti: Proposed pathway and toxicity

Cited by 38 publications

References 45 publications

A low‐voltage pulse electrolysis method for the degradation of anthraquinone and azo dyes in chloride medium by anodic oxidation on Ti/IrO2‐RuO2‐SnO2 electrodes

A low‐voltage pulse electrolysis method for the degradation of anthraquinone and azo dyes in chloride medium by anodic oxidation on Ti/IrO2‐RuO2‐SnO2 electrodes

Electrochemical Degradation of Reactive Blue 19 Dye by Combining Boron‐Doped Diamond and Reticulated Vitreous Carbon Electrodes

Preparation, characterization and environmental application of the composite electrode TiO2‐NTs/SnO2—Sb with carbon aerogels

Contact Info

Product

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A low‐voltage pulse electrolysis method for the degradation of anthraquinone and azo dyes in chloride medium by anodic oxidation on Ti/IrO₂‐RuO₂‐SnO₂ electrodes

A low‐voltage pulse electrolysis method for the degradation of anthraquinone and azo dyes in chloride medium by anodic oxidation on Ti/IrO₂‐RuO₂‐SnO₂ electrodes

Preparation, characterization and environmental application of the composite electrode TiO₂‐NTs/SnO₂—Sb with carbon aerogels