Electrochemical Degradation of Diuron in Chloride Medium using DSA<sup>®</sup>Based Anodes

Pipi, Angelo Ricardo Fávaro; Neto, Sidney Aquino; Andrade, Adalgisa R. de

doi:10.5935/0103-5053.20130159

Cited by 7 publications

(8 citation statements)

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“…The results show different voltamograms of well-defined reduction peaks confirming time dependent electro oxidation of the dissolved organic matter. This is evidence of the degradation of the oxidizable species on surface of the titanium dioxide coated dimensionally stable electrode ( Pipi et al., 2013 ). The signals recorded as -0.180 V at the physiological pH of water was considered and were assigned to iron as suggested by Toh et al.…”

Section: Resultsmentioning

confidence: 98%

Iron (III) doped titanium dioxide coated dimensionally stable graphite anode electrode for electro-chemical treatment of domestic wastewater

Mwangi

Kinyua

Nthumbi

et al. 2021

Heliyon

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Availability of clean water is of concern due to pollution and diminishing supply pollution. However, purification is possible depending on the incorporated contaminants. Domestic wastewater contains dissolved organic matter and its remediation can be done by oxidation. The best oxidation can be achieved by electron transfer the same way metabolic processes occur. This study exploited the use of a film of iron (III) doped titanium dioxide applied on an electrode which was found to be effective. Natural light conditions generated electrons that migrated through the electrode leaving behind holes which oxidized the contaminants as the excess electrons were discharged at the cathode after passing through the casted proton exchange membrane (PEM) separating the two half cells of the prepared reactor. This electrochemical method has the advantage in that the organic pollutants are oxidized to carbon dioxide with no secondary pollutants and the inorganic pollutants into insoluble matter. The assembled cell was applied to purify both synthetic and real water samples of green leafy vegetable solution from the kitchen by clarification. The clarification process was monitored by UV-Vis using distilled water as a reference to compare the light that transmitted through a sample. It was observed that the electro-oxidation process took place showing a high potential 105 mV within the first 150 min followed by degradation at a high rate. The oxidation of the organic matter was confirmed by UV-Vis analysis as well as by cyclic voltametric analysis of iron released into the solution of the synthetic samples. The electro chemical treatment of the water was then applied to purify real water samples made from a sample of 4.5 g minced of green vegetables dispersed in one liter of water (4.5 g/l). The green leafy coloured solution was clarified after 154 h of continuous oxidation. The degradation process was confirmed to be independent of intermediates or other species present in solution as it was of first order reaction kinetics. The electrochemical oxidation of organic matter in water using iron (III) doped titanium dioxide coated graphite electrode has potential application on the purification of water.

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Section: Resultsmentioning

confidence: 98%

Iron (III) doped titanium dioxide coated dimensionally stable graphite anode electrode for electro-chemical treatment of domestic wastewater

Mwangi

Kinyua

Nthumbi

et al. 2021

Heliyon

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“…Hypochlorous acid (Eº = 1.49 V vs. NHE) act as the main oxidizing agent in the degradation reactions due to its greater oxidation power in comparison to the other electrochemically generated active chlorine species like ClO -(Eº = 0.89 V vs. NHE) and Cl2 (1.36 V vs. NHE) 22,40,41 . As the pKa of HClO is 7.5, the protonated species predominates when pH < 7.5.…”

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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“…Two intense bands located at 211 nm and 247 nm can be observed. In general, the band used to monitor the degradation of diuron with time is the second one (λ ≈ 247 nm) [53][54][55][56][57][58][59][60]. This band has been assigned to the typical π → π* transition of the aromatic ring [60].…”

Section: Nanostructures Morphology: Influence Of Anodization Electrolytementioning

confidence: 99%

“…Concentration/ppm Absorbance 247 nm were detected, which may indicate that diuron degradation proceeded through the cleavage of the aromatic ring, instead of proceeding via hydroxylation and chlorine substitution. For example, Pipi et al [59], observed the appearance of an intense absorbance peak at wavelengths of 300 nm after 4 hours of diuron electrolysis using DSA electrodes, which suggested the formation of a byproduct able to absorb radiation at higher wavelengths than diuron. Kovács et al [60] observed a slight red shift upon dechlorination of the aromatic ring by gamma radiolysis (from λmax = 248 nm for diuron to λmax = 238 nm for the non-chlorinated fenuron).…”

Section: Nanostructures Morphology: Influence Of Anodization Electrolytementioning

confidence: 99%

“…Kovács et al [60] observed a slight red shift upon dechlorination of the aromatic ring by gamma radiolysis (from λmax = 248 nm for diuron to λmax = 238 nm for the non-chlorinated fenuron). Hence, the reduction of the diuron absorbance peaks and the absence of new peaks or shifts in the peak at 247 nm, indicated removal of diuron to form simple molecules [59].…”

Section: Nanostructures Morphology: Influence Of Anodization Electrolytementioning

confidence: 99%

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Visible-light photoelectrodegradation of diuron on WO3 nanostructures

Fernández‐Domene

Sánchez-Tovar

Lucas-Granados

et al. 2018

Journal of Environmental Management

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The degradation of pesticide diuron has been explored by photoelectrocatalysis (PEC) under visible light illumination using two different WO nanostructures, obtained by anodization of tungsten. The highest degradation efficiency (73%) was obtained for WO nanosheets synthesized in the presence of small amounts of hydrogen peroxide (0.05 M). For that nanostructure, the kinetic coefficient for diuron degradation was 133% higher than that for the other nanostructure (anodized in the presence of fluoride anions). These results have been explained by taking into account the different architecture and dimensions of the two WO nanostructures under study.

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Electrochemical Degradation of Diuron in Chloride Medium using DSA^®Based Anodes

Cited by 7 publications

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Iron (III) doped titanium dioxide coated dimensionally stable graphite anode electrode for electro-chemical treatment of domestic wastewater

Iron (III) doped titanium dioxide coated dimensionally stable graphite anode electrode for electro-chemical treatment of domestic wastewater

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

Visible-light photoelectrodegradation of diuron on WO3 nanostructures

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Electrochemical Degradation of Diuron in Chloride Medium using DSA®Based Anodes

Cited by 7 publications

References 0 publications

Iron (III) doped titanium dioxide coated dimensionally stable graphite anode electrode for electro-chemical treatment of domestic wastewater

Iron (III) doped titanium dioxide coated dimensionally stable graphite anode electrode for electro-chemical treatment of domestic wastewater

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

Visible-light photoelectrodegradation of diuron on WO3 nanostructures

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Electrochemical Degradation of Diuron in Chloride Medium using DSA^®Based Anodes