Developments in electrode materials for wastewater treatment

Salazar‐Banda, Giancarlo R.; Gonzaga, Isabelle M.D.; Dória, Aline Resende; Eguiluz, Katlin Ivon Barrios

doi:10.1016/j.coelec.2020.100663

Cited by 66 publications

(19 citation statements)

References 43 publications

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“…The hypochlorite ion oxidizes the Fe-TA on HAp and BE, eliminating the stain. This chloride bleaching mechanism has previously been discussed in earlier publications [ 29 , 30 ]. The oxidative chemistry of iron tannate not being very simple, involves the formation of complex products.…”

Section: Discussionmentioning

confidence: 69%

“…The active role of hypochlorite has been extensively investigated in the literature for dye degradation [ 16 , 17 , 18 , 19 , 20 ]. Various literature reviews concerning the electrochemical oxidation of various organic materials and pollutants in waste water treatments had been well documented [ 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 ].…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical mineralization of iron-tannate stain on HAp and bovine enamel-A non-peroxide approach

Suryanarayanan

Pattanayak

Kumar³

et al. 2021

Heliyon

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Prolonged treatments for the destaining of teeth using high concentrations of hydrogen peroxide may cause secondary unwanted effects such as tooth hypersensitivity and gingival irritation. Hence, it is aimed to develop a non-peroxide-based method to oxidize iron-tannate (Fe-TA) stained hydroxyapatite (HAp) and bovine enamel (BE) samples. Constant current electrolysis (CCE) experiments were carried out on Pt working electrode in aqueous NaCl, KCl and KI solutions at discrete concentrations under continuous experiment and a non-continuous experiment. CCE shows that in the presence of iron tannate (Fe-TA) stained HAP, approximately 30 ppm of iodine was generated using 0.1M KI and nearly 40 ppm was produced with 0.2 M KI. By using a non-continuous CCE process, the lowest amount of chlorine was generated from NaCl solution, which was well within the safety limits for oral applications. Depending on the experimental conditions used, between 13 ppm and 124 ppm of chlorine was generated. CCE of Fe-TA stained on HAp using KCl reveals that at the lowest current density of 10 mA/cm 2 , the amount of hypochlorite generated was 20 ppm on Pt electrode having a surface area of 6 cm 2 . Ion chromatographic (IC) analysis revealed that non-continuous CCE of Fe-TA-BE in NaCl generated a low concentration of sodium perchlorate (0.8 ppm), whereas the continuous process generated no perchlorate, but a considerable higher quantity of chlorate for Fe-TA-BE (37 ppm) and Fe-TA-HAp (140 ppm) samples.

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Section: Discussionmentioning

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Electrochemical mineralization of iron-tannate stain on HAp and bovine enamel-A non-peroxide approach

Suryanarayanan

Pattanayak

Kumar³

et al. 2021

Heliyon

View full text Add to dashboard Cite

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“…The treatment of poorly biodegradable organics is essential in the effluents treatment industry. Advanced electrochemical oxidation technology (AEOT) is considered to be a promising method to deal with this issue, owing to its advantages in efficiency and flexibility [1][2][3]. Organic degradation reactions mostly occur on the anode surface, which plays a crucial role in the electrochemical treatment process.…”

Section: Introductionmentioning

confidence: 99%

Ti/SnO2-Sb2Ox-TiO2 Electrodeposited from Methanesulfonate Electrolytes: Preparation, Properties, and Performance

et al. 2022

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In this study, Ti/SnO2-Sb2Ox-TiO2 electrodes were produced using a sol-enhanced electrodeposition technique from methanesulfonate electrolytes. The surface microstructures of Ti/SnO2-Sb2Ox-TiO2 were observed, and their phase constituents were determined. The surface features were analyzed by X-ray photoelectron spectroscopy. Linear sweep voltammetry and degradation tests were also conducted to determine the degradation performance. The results show that the addition of TiO2 sol affects the microstructures of Ti/SnO2-Sb2Ox-TiO2 electrodes, while a uniform coating surface can be obtained at a proper sol concentration in electrolytes. Adding TiO2 sol also causes deep oxidation of Sb and generates more adsorbed oxygen on the electrode surface. The favorable surface features and the well-dispersed TiO2 in the coatings of 10 mL/L TiO2 modified Ti/SnO2-Sb2Ox-TiO2 electrodes award them the best electrocatalytic performance, and their uniform coating surface prolongs the electrode service life.

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“…As previously mentioned, the material is among the important factors in the performance of electrochemical methods [ 32 ]. In the market, there are already many types of electrode materials used for wastewater treatment, such as; aluminum (Al), graphite (Gr), titanium (Ti), as well as iron (Fe).…”

Section: Introductionmentioning

confidence: 99%

Assessing the Influence of Electrode Polarity on the Treatment of Poultry Slaughterhouse Wastewater

et al. 2022

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Electrochemical methods have been increasingly gaining popularity in the field of wastewater treatment. However, the performance of these methods can be highly affected by the polarity direction as determined by the electrodes arrangement (anode to cathode or cathode to anode); as well as the characteristics of the wastewater to be treated as determined by the type of wastewater. The presented research work investigated the relationship between polarity direction and the removal of pollutants from poultry slaughterhouse wastewater using titanium and aluminium electrode materials. In the first case, the wastewater was exposed to the Ti (anode)-Al (cathode) combination, whereas in the second case the wastewater was subjected to the Al (anode)-Ti (cathode) arrangement. The two cases were designed to see if the polarity direction of the chosen electrode materials affected the removal of pollutants. The removal efficiencies were computed as a ratio of the remaining concentration in the treated effluent to the concentration before treatment. It was observed that the production processes generate highly fluctuating wastewater in terms of pollution loading; for instance, 422 to 5340 Pt-Co (minimum to maximum) were recorded from color, 126 to 2264 mg/L were recorded from total dissolved solids, and 358 to 5998 mg/L from chemical oxygen demand. Also, the research results after 40 min of retention time showed that both electrode arrangements achieved relatively high removal efficiencies; Whereby, the aluminium to titanium polarity achieved up to 100% removal efficiency from turbidity while the titanium to aluminium polarity achieved a maximum of 99.95% removal efficiency from turbidty. Also, a similar phenomenon was observed from total dissolved solids; whereby, on average 0 mg/L was achieved when the wastewater was purified using the aluminium to titanium arrangement, while on average 2 mg/L was achieved from the titanium to aluminium arrangement. A little higher removal efficiency discrepancy was observed from ammonia; whereby, the aluminium to titanium arrangement outperformed the titanium to aluminium arrangement with average removal efficiencies of 82.27% and 64.11%, respectively.

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Developments in electrode materials for wastewater treatment

Cited by 66 publications

References 43 publications

Electrochemical mineralization of iron-tannate stain on HAp and bovine enamel-A non-peroxide approach

Electrochemical mineralization of iron-tannate stain on HAp and bovine enamel-A non-peroxide approach

Ti/SnO2-Sb2Ox-TiO2 Electrodeposited from Methanesulfonate Electrolytes: Preparation, Properties, and Performance

Assessing the Influence of Electrode Polarity on the Treatment of Poultry Slaughterhouse Wastewater

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