Photo-assisted electrochemical degradation of sulfamethoxazole using a Ti/Ru0.3Ti0.7O2 anode: Mechanistic and kinetic features of the process

Hussain, Sajjad; Steter, Juliana R.; Gul, Saima; Motheo, Artur J.

doi:10.1016/j.jenvman.2017.06.043

Cited by 44 publications

(25 citation statements)

References 60 publications

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“…Most recently, researchers have been exploring the coupling of technologies, in order to improve the efficiency of electrochemical treatments. Electro‐Fenton process,, electrolysis irradiated by UV light and electrochemistry combined to sonochemistry can be highlighted, where in most cases better results are observed for the coupled processes due to a synergistic effect. Because the coupling, more oxidant agents can be produced and, most important, it can be promoted the activation of such species, which means that highly reactive species can be formed from poorly reactive oxidants.…”

Section: Introductionmentioning

confidence: 99%

Coupling Ultrasound to the Electro‐Oxidation of Methyl Paraben Synthetic Wastewater: Effect of Frequency and Supporting Electrolyte

et al. 2018

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In this paper, electrooxidation of methyl paraben (MeP) is studied by electrolysis only and electrolysis coupled with sonolysis, using a diamond electrode. Complete mineralization of MeP was achieved for both processes, in chloride and sulfate media. Results showed that, although the oxidation of pollutant is faster in the presence of chloride, the mineralization is favored in sulfate medium. Ultrasound irradiation enhanced the removal of organic matter due to the activation of oxidant species in both supporting electrolytes. Moreover, the formation of chlorine gas in the chloride containing medium improves the ultrasound cavitation effect, promoting faster depletion of the total organic carbon in the first hour of treatment. Regarding the formation of more toxic products, all possible organochlorinated intermediates were removed, since complete mineralization was attained in less than 5 hours. Ultrasonic coupling to the electrolysis process accelerates the destruction of the intermediates and delays the formation of perchlorate, which only begins after the complete removal of the total organic carbon. Low and high ultrasound frequencies were evaluated and were found to produce different effects of cavitation, which affect the electrolysis in different ways. The final result will be a balance between these effects and thus, an optimum frequency can be established for different systems.

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Section: Introductionmentioning

confidence: 99%

Coupling Ultrasound to the Electro‐Oxidation of Methyl Paraben Synthetic Wastewater: Effect of Frequency and Supporting Electrolyte

et al. 2018

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“…Therefore, increasing sodium chloride concentration increases the formation of electrogenerated chlorine species (Cl2/HClO/ClO -) and the use of high current densities leads to an increase in the amount of these species, allowing alachlor degradation [43][44][45] . For this reason, the highest removal and mineralization of alachlor was achieved with 0.15 mol L -1 NaCl and current density equal to 50 mA cm -2 .…”

Section: Effect Of Electrolyte Concentration and Current Densitymentioning

confidence: 99%

Electrochemical degradation of aqueous alachlor and atrazine: products identification, lipophilicity, and ecotoxicity

2019

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This work studied the electrochemical degradation of alachlor and atrazine (alone and mixed with each other) using a filter-press cell, a dimensionally stable anode (DSA Ti/Ru0.3Ti0.7O2), initial pH 3.0, and temperature at 25 °C. The best operational conditions for alachlor (0.33 mmol L-1) degradation were obtained by a 32 factorial design, in which the factors/levels were: NaCl concentration (0.05, 0.1, and 0.15 mol L-1) and current density (10, 30, and 50 mA cm-2). Thus, 93.1% alachlor removal and 71.2% mineralization were achieved using 0.15 mol L-1 NaCl and 30 mA cm-2. In addition, the initial degradation products (DPs) of alachlor and atrazine were identified by liquid chromatography coupled to mass spectrometry (LC-MS). Acute and chronic ecotoxicities for three trophic levels (fishes, daphnids and green algae) and lipophilicity (log D, pH 7.4) of the DPs were also estimated using the ECOSAR 1.11 and ChemAxon Calculator software, respectively. The present study showed that the electrochemical degradation is an efficient method for removing the herbicides alachlor and atrazine from water and that the DPs formed have lower pollution potential than their original compounds.

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“…Consequently, these anodes have been used in a wide range of wastewater treatment for recalcitrant organic pollutants . The most common DSA‐type anode in wastewater treatment is Ti/Ru 0.3 Ti 0.7 O 2 (DSA‐Cl 2 ) due to its high catalytic activity, high stability to anodic corrosion and mechanical steadiness, as well as high electrocatalytic activity for chlorine evolution as a consequence of the surface redox reactions taking place at transition metal ions that act as active sites for the absorption of chlorine atoms . Several studies have addressed the effects of dye concentration, pH, supporting electrolyte, electrode material and current density on dye removal efficiency,− but limited works analyze intermediates, by‐products and dye degradation mechanisms …”

Section: Introductionmentioning

confidence: 99%

Decolorization and Degradation of a Mixture of Industrial Azo Dyes by Anodic Oxidation Using a Ti/Ru_0.3Ti_0.7O₂ (DSA‐Cl₂) Electrode.

et al. 2019

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The electrochemical treatment of wastewaters from the textile industry is a promising alternative for the elimination of organic pollutants. This study approach the decolorization and chemical oxygen demand (COD) removal from synthetic water (0.91 mM Acid Yellow 25 dye ‐ and ‐ 0.42 mM Acid Blue 29 dye), by anodic oxidation (AO) in batch mode using a Ti/Ru0.3Ti0.7O2 (DSA‐Cl2) electrode as anode and an AISI 304 stainless steel plate as cathode. The influence of pH (3, 7 and 10), type of supporting electrolyte (50 mM Na2SO4, 50 mM NaCl and 100 mM NaCl) and applied current density (10 < j < 80 mA cm–2) on COD removal and mineralization current efficiency was analyzed. The best AO test in terms of energy consumption was performed at pH 7, 50 mM NaCl and j=30 mA cm–2, obtaining a complete decolorization and COD removal. These operating parameters have an energy consumption between 0.41 and 0.82 kWh m–3. High performance liquid chromatography (HPLC‐MS/MS) analyses indicated the presence of several organic intermediates and carboxylic acids.

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Photo-assisted electrochemical degradation of sulfamethoxazole using a Ti/Ru0.3Ti0.7O2 anode: Mechanistic and kinetic features of the process

Cited by 44 publications

References 60 publications

Coupling Ultrasound to the Electro‐Oxidation of Methyl Paraben Synthetic Wastewater: Effect of Frequency and Supporting Electrolyte

Coupling Ultrasound to the Electro‐Oxidation of Methyl Paraben Synthetic Wastewater: Effect of Frequency and Supporting Electrolyte

Electrochemical degradation of aqueous alachlor and atrazine: products identification, lipophilicity, and ecotoxicity

Decolorization and Degradation of a Mixture of Industrial Azo Dyes by Anodic Oxidation Using a Ti/Ru_0.3Ti_0.7O₂ (DSA‐Cl₂) Electrode.

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Photo-assisted electrochemical degradation of sulfamethoxazole using a Ti/Ru0.3Ti0.7O2 anode: Mechanistic and kinetic features of the process

Cited by 44 publications

References 60 publications

Coupling Ultrasound to the Electro‐Oxidation of Methyl Paraben Synthetic Wastewater: Effect of Frequency and Supporting Electrolyte

Coupling Ultrasound to the Electro‐Oxidation of Methyl Paraben Synthetic Wastewater: Effect of Frequency and Supporting Electrolyte

Electrochemical degradation of aqueous alachlor and atrazine: products identification, lipophilicity, and ecotoxicity

Decolorization and Degradation of a Mixture of Industrial Azo Dyes by Anodic Oxidation Using a Ti/Ru0.3Ti0.7O2 (DSA‐Cl2) Electrode.

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Decolorization and Degradation of a Mixture of Industrial Azo Dyes by Anodic Oxidation Using a Ti/Ru_0.3Ti_0.7O₂ (DSA‐Cl₂) Electrode.