Use of conductive diamond photo-electrochemical oxidation for the removal of pesticide glyphosate

Rubí-Juárez, Humberto; Cotillas, Salvador; Sáez, Cristina; Cañizares, Pablo; Barrera-Díaz, Carlos; Rodrigo, Manuel A.

doi:10.1016/j.seppur.2016.04.048

Cited by 46 publications

(26 citation statements)

References 52 publications

(70 reference statements)

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“…At this point, in the literature it has been reported that electrogenerated oxidants should be activated to promote mediated oxidation efficiently [36][37][38][39][40][41][42][43]. It is well known that the photo-activation of stable oxidants in the bulk can occur when the electrolytic system is irradiated with UV light.…”

Section: Resultsmentioning

confidence: 99%

The Role of Mediated Oxidation on the Electro-irradiated Treatment of Amoxicillin and Ampicillin Polluted Wastewater

et al. 2018

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In this work, the electrolysis, photoelectrolysis and sonoelectrolysis with diamond electrodes of amoxicillin (AMX) and ampicillin (AMP) solutions were studied in the context of the search for technologies capable of removing antibiotics from liquid wastes. Single-irradiation processes (sonolysis and photolysis) were also evaluated for comparison. Results showed that AMX and AMP are completely degraded and mineralized by electrolysis in both chloride and sulfate media, although the efficiency is higher in the presence of chloride. The effect of the current density on mineralization efficiency is not relevant and this may be related to the role of mediated oxidation. Irradiation by ultraviolet light or ultrasound (US) waves does not produce a synergistic effect on the mineralization of AMX and AMP solutions. This indicates that the massive formation of radicals during the combined processes can favor their recombination to form stable and less reactive species.

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Section: Resultsmentioning

confidence: 99%

The Role of Mediated Oxidation on the Electro-irradiated Treatment of Amoxicillin and Ampicillin Polluted Wastewater

et al. 2018

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“…3-4) [25]. Together with hydroxyl radicals, these species are the main cause of organics degradation in sulfate media with diamond electrodes [31]. This behavior has been widely reported in the literature for the removal of dyes and other organic pollutants by electrolysis with diamond anodes in the presence of large amounts of sulfate ions [7,[32][33][34].…”

Section: H2o → H + + •Oh + E -[2]mentioning

confidence: 94%

Removal of Procion Red MX-5B dye from wastewater by conductive-diamond electrochemical oxidation

Cotillas

Llanos

Cañizares

et al. 2018

Electrochimica Acta

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142

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In this work, the removal of Procion Red MX-5B dye by electrochemical oxidation with boron doped diamond (BDD) anodes was investigated. The impact of current density, flow rate, initial pH, and supporting electrolyte was evaluated on dye and organic matter removal. Furthermore, the use of dimensionally stable anodes (DSA) was tested to evaluate process performance. Results show that after 240 minutes, it is possible to achieve full dye and COD (chemical oxygen demand) removal, regardless of applied current density. This is due to the generation of powerful oxidantsi.e. hydroxyl radicals and peroxodisulfate-, which attack the organic matter in the wastewater, promoting its complete degradation. However, process efficiency increases when using lower current densities (10 mA cm-2): electric charges of about 5 Ah dm-3 are sufficient to fully remove both dye and COD, while charges higher than 15 Ah dm-3 are required when working at higher current densities (> 30 mA cm-2). This fact is related to the production of large amounts of hydroxyl radicals, which are wasted in other reactions at higher current densities. On the other hand, higher flow rates (300 dm 3 h-1) promote Procion Red MX-5B and organic matter degradation, due to improved mass transfer within the system. Regarding the impact of initial pH on dye removal, no significant differences were observed. Conversely, COD is clearly affected by this parameter: it is only possible to fully remove the organic matter when working at natural pH. Finally, with DSA anodes, higher dye removal efficiencies are attained than with BDD electrodes, when 100 mg dm-3 chlorides are added to the supporting electrolyte. Likewise, higher chloride concentration (100-1000 mg dm-3) was observed to enhance process efficiency when using DSA as anode material. However, during electrolysis with both BDD and DSA, chloride ions in the supporting electrolyte promote the production of 3 intermediate organochlorinated compounds. Therefore, under these conditions, no full organic matter removal can be achieved, regardless of the anode material employed.

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“…These radicals also contribute to the degradation of the organic matter and, therefore, enhance the electrochemical treatment (Adewuyi, 2005;Almazán-Sánchez et al, 2017;Cotillas et al, 2018). Likewise, the irradiation of the solution with UV light during electrolysis (photoelectrolysis) favors the potential production of free radicals from the photo-activation of the oxidants present in wastewater (Cotillas et al, 2016;Rubí-Juárez et al, 2016). Therefore, both technologies (ultrasound and UV light irradiation) enhance the removal rate of electrolysis with diamond electrodes (Martínez-Huitle et al, 2015).…”

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Degradation of dye Procion Red MX-5B by electrolytic and electro-irradiated technologies using diamond electrodes

et al. 2018

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This work focuses on the treatment of synthetic wastewater polluted with dye Procion Red MX-5B by different Electrochemical Advanced Oxidation Processes (EAOP) based on diamond anodes. The influence of the current density and the supporting electrolyte has been studied on dye removal and total mineralization of the organic matter. Results show that electrolysis with diamond electrodes is a suitable technology for an efficient degradation of dye. Nonetheless, the process efficiency increases when using chloride as supporting electrolyte because of the electrochemical generation of hypochlorite in wastewater which significantly contribute to dye removal. On the contrary, the total mineralization of the organic matter is more efficient in sulfate media. In this case, large amounts of peroxodisulfate are electrogenerated, favoring the complete removal of total organic carbon (TOC). On the other hand, lower current densities (10 mA cm) lead to a more efficient removal of both dye and TOC due to the mass transfer limitations of the technology. Finally, the coupling of UV light irradiation or ultrasound to electrolysis significantly improves the process performance, being photoelectrolysis the most efficient technology for the treatment of wastewater polluted with Procion Red MX-5B. This fact is due to the potential production of free chlorine or sulfate radicals that takes place by the activation of the electrogenerated oxidants. These species are more reactive than oxidants and, therefore, they quickly attack the organic matter present in wastewater.

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Use of conductive diamond photo-electrochemical oxidation for the removal of pesticide glyphosate

Cited by 46 publications

References 52 publications

The Role of Mediated Oxidation on the Electro-irradiated Treatment of Amoxicillin and Ampicillin Polluted Wastewater

The Role of Mediated Oxidation on the Electro-irradiated Treatment of Amoxicillin and Ampicillin Polluted Wastewater

Removal of Procion Red MX-5B dye from wastewater by conductive-diamond electrochemical oxidation

Degradation of dye Procion Red MX-5B by electrolytic and electro-irradiated technologies using diamond electrodes

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