Enhancement of wastewater treatment using novel laser-made Ti/SnO2–Sb anodes with improved electrocatalytic properties

Santos, Géssica de Oliveira Santiago; Dória, Aline Resende; Vasconcelos, Vanessa M.; Sáez, Cristina; Rodrigo, Manuel A.; Eguiluz, Katlin Ivon Barrios; Salazar‐Banda, Giancarlo R.

doi:10.1016/j.chemosphere.2020.127475

Cited by 26 publications

(7 citation statements)

References 66 publications

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“…The experiment was conducted in a cylindrical glass reactor (500 mL) with a sludge volume of 400 mL throughout the experiment. A Ti/SnO 2 -Sb [36][37][38][39] mesh electrode was used as the anode, with a titanium mesh as the cathode. Both the cathode plate and anode plate were of an area of 5 cm 2 , while the distance between both plates was 1 cm.…”

Section: Electrochemical Cell Lysis Experimental Setupmentioning

confidence: 99%

Effect of on-Site Sludge Reduction and Wastewater Treatment Based on Electrochemical-A/O Combined Process

Han

Zhou

et al. 2021

Water

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Working on sludge with electrochemical oxidation is beneficial to promote the subsequent recessive growth of microorganisms in the sludge. To achieve the on-site sludge reduction, this study combined the anoxic/oxic (A/O) process with the electrochemical oxidation process based on the cell lysis-cryptic growth theory by determining the experimental conditions and mechanism of electrochemical cell lysis. The sludge reduction and effluent treatment of the combined process in practical operation were studied. The results showed that the cumulative sludge discharge had been reduced by 37.1% compared with that of the A/O process, and the apparent sludge yield had been reduced by 39.1% during the 30-day operation time, indicating that the electrochemical-A/O combined process could have a considerable sludge reduction effect. After the treatment, chemical oxygen demand (COD), ammonium nitrogen, and total nitrogen in the effluent of the combined process reached 33.02 mg/L, 0.83 mg/L, and 9.95 mg/L, respectively. Due to the limitation of the A/O process, the removal of total phosphorus was poor. As a result, poly aluminum chloride (PAC) was employed to achieve a chemical removal of phosphorus, by which the total phosphorus (TP) of the effluent was controlled to be lower than 0.5 mg/L.

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Section: Electrochemical Cell Lysis Experimental Setupmentioning

confidence: 99%

Effect of on-Site Sludge Reduction and Wastewater Treatment Based on Electrochemical-A/O Combined Process

Han

Zhou

et al. 2021

Water

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“…It is known [ 33 ] that SnO 2 has a high catalytic activity in oxygen transfer reactions. Despite the fact that modified tin dioxide is highly active in oxidation of aniline [ 34 ] and phenol, [ 35 ] we consider them not very promising for the target processes discussed in this work, due to the low overvoltage of oxygen evolution. In contrast to the electrooxidation of organic substances, the potentials of oxygen evolution and Cl – oxidation differ insignificantly, and taking into account the low Tafel slopes for chloride ion oxidation, there is a high probability that processes involved will prevail over oxygen evolution even in low concentrated NaCl solutions.…”

Section: Resultsmentioning

confidence: 99%

“…), which are electron donors, in order to increase the electrical conductivity of tin dioxide. [27][28][29] It is also promising to create composite coatings based on SnO 2 and noble metal oxides. [11] Such coatings have high corrosion resistance and, at the same time, do not add unwanted impurities to the solution during the synthesis of medical and veterinary drugs based on sodium hypochlorite.…”

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confidence: 99%

Cl^–/ClO^– process on SnO₂‐based electrodes in low‐concentrated NaCl solutions

Shmychkova

Гиренко

Величенко

2021

Electrochemical Science Adv

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Anode processes on SnO 2 -based electrodes in low-concentrated NaCl solutions have been investigated. The current-voltage curves for 25 tin oxide anodes doped with various amounts of platinum group metals in 0.5 M NaClO 4 and 0.5 M NaClO 4 + 0.5 M NaCl have been analyzed. The correlation criterion between the catalytic activity of the coating in relation to the reaction of synthesis of NaClO, NaClO 3 from low-concentrated NaCl solutions, and the oxygen evolution overpotential was found. The formulated criterion is fully met by SnO 2 -coatings doped with both palladium (5-15 at.%) and platinum (5-10 at.%), which are the optimal electrocatalysts for the synthesis of sodium hypochlorite. In this case, their catalytic activity does not depend on the concentrations of dopant in the range, which allows to obtain anodes with reproducible properties by pyrolysis. The current efficiency of NaClO is 90-95% and current efficiency of chlorate is less than 1% during the electrolysis of 0.15 M NaCl on Ti/SnO 2 -Pt-Pd anodes at 40-60 mA/cm 2 . Palladium exists in the form of PdO phase in the electrocatalytic coating Ti/SnO 2 -Pt-Pd. The surface oxygen concentration in H 2 O ads and OH ads is comparable to the oxygen content of the phase oxides of tin and palladium in the coating containing 19.5 at.% Pd, indicating a high surface content of adsorbed water. Palladium oxides are the main centers of water adsorption, and their presence on the surface of the anodes contributes to the hydroxylation of the surface.Most likely, this property of palladium compounds provides its high electrocatalytic activity in the reaction of formation of hypochlorite, which involves labile oxygen-containing particles low bonded to the surface.

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“…A novel Ti/SnO 2 -Sb anode prepared by thermal decomposition of polymer precursors using CO 2 laser heating was fabricated by Santos et al 59 First, the Ti plate was pretreated by sand blast. In addition, the precursor solution was prepared using SnCl 2 , SbCl 3 , anhydrous CA, and EG.…”

Section: Ti/sno 2 -Sbmentioning

confidence: 99%

Treatment of organic matter and ammonia nitrogen in wastewater by electrocatalytic oxidation: a review of anode material preparation

Jing

Yang

et al. 2022

Environ. Sci.: Water Res. Technol.

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Enhancement of wastewater treatment using novel laser-made Ti/SnO2–Sb anodes with improved electrocatalytic properties

Cited by 26 publications

References 66 publications

Effect of on-Site Sludge Reduction and Wastewater Treatment Based on Electrochemical-A/O Combined Process

Effect of on-Site Sludge Reduction and Wastewater Treatment Based on Electrochemical-A/O Combined Process

Cl^–/ClO^– process on SnO₂‐based electrodes in low‐concentrated NaCl solutions

Treatment of organic matter and ammonia nitrogen in wastewater by electrocatalytic oxidation: a review of anode material preparation

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Enhancement of wastewater treatment using novel laser-made Ti/SnO2–Sb anodes with improved electrocatalytic properties

Cited by 26 publications

References 66 publications

Effect of on-Site Sludge Reduction and Wastewater Treatment Based on Electrochemical-A/O Combined Process

Effect of on-Site Sludge Reduction and Wastewater Treatment Based on Electrochemical-A/O Combined Process

Cl–/ClO– process on SnO2‐based electrodes in low‐concentrated NaCl solutions

Treatment of organic matter and ammonia nitrogen in wastewater by electrocatalytic oxidation: a review of anode material preparation

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Product

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Cl^–/ClO^– process on SnO₂‐based electrodes in low‐concentrated NaCl solutions