Electrochemical removal of nitrate from wastewater with a Ti cathode and Pt anode for high efficiency and N2 selectivity

Yao, Jiachao; Yu, Mei; Yuan, Tongbin; Chen, Jun; Pan, Hua; Wang, Jiade

doi:10.1016/j.jelechem.2021.115019

Cited by 35 publications

(19 citation statements)

References 62 publications

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“…The effect of pH on NO 3 À -N and TN removal was explored in our experiment, and the result indicated that a slight decrease as the pH increased from 3 to 10 (Figure 7). The result was different from that reported by Yao et al (2021), who found that the NO 3 À -N removal was the lowest at pH 7, which was nearly 50% lower than that of pH 3 by using the Ti electrode as cathode. However, Tang et al (2019) found that pH 9 was best for nitrate reduction as the function of Fe 0 , Cu 0 and the chelating resin by the Fe-Cu/D407 cathode.…”

Section: Nitrate Reductioncontrasting

confidence: 99%

Preparation of Co/Ti electrode by electro-deposition for aqueous nitrate reduction

Jiang

Han

Wang

et al. 2021

Journal of Water Reuse and Desalination

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A Co/Ti electrode for nitrate reduction was prepared by electrode-deposition. In the single-compartment electrolysis cell, nitrate (100 mg/L) removal reached nearly 100% after 3 h electrolysis under the current density of 20 mA cm–2 by using the Co/Ti electrode as cathode, and the main reduction products were ammonium nitrogen (66.5%) and nitrogen gas (33.5%). This performance on nitrate removal was comparable to a Co3O4/Ti electrode, and the electroactivity of the Co/Ti electrode towards nitrite reduction was higher than that of a Co3O4/Ti electrode. The Co/Ti electrode exhibited an improved stability with 18.7% of mass loss and 25.5% of Co dissolution compared with the Co3O4/Ti electrode after ultrasonic interference. The presence of chlorine ion (1,000 mg/L) could promote the total nitrogen (TN) removal to approximately 100% after 3 h electrolysis because of the ammonium oxidation by the free chlorine produced from the anode. In the presence of calcium (50 mg/L) and phosphate (0.5 mg/L), the nitrate removal decreased from 85.4 ± 1.5 to 57.7 ± 3.5% after ten reuse cycles. This result suggests that Ca and P should be pre-removed before the electro-reduction of nitrate.

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Section: Nitrate Reductioncontrasting

confidence: 99%

Preparation of Co/Ti electrode by electro-deposition for aqueous nitrate reduction

Jiang

Han

Wang

et al. 2021

Journal of Water Reuse and Desalination

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“…35 The signals at 1419 cm −1 , 1453 cm −1 and 1650 cm −1 verify the adsorbed NH 3 during the reduction process of NO 2 − . 36,37 The electroreduction of NO 2 − to ammonia generally involves a six-electron and seven-proton process (NO 2 − + 6H 2 O + 6e = NH 4 OH + 7OH − ). 38 Then, we calculated the Gibbs free energy of the key intermediates over Co 3 O 4 and C/Co 3 O 4 for comparison.…”

Section: Resultsmentioning

confidence: 99%

“…. 36,37 The electroreduction of NO 2 À to ammonia generally involves a six-electron and seven-proton process (NO 2 À + 6H 2 O + 6e = NH 4 OH + 7OH À ). 38 battery is determined to be 1.45 V with good stability for more than 8 hours (Fig.…”

mentioning

confidence: 99%

A Zn–nitrite battery as an energy-output electrocatalytic system for high-efficiency ammonia synthesis using carbon-doped cobalt oxide nanotubes

Zhang

Guo

et al. 2022

Energy Environ. Sci.

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“…In our previous work [ 23 ], the feasibly of simultaneous removal of COD and TN was proven; however, it should be noticed that one of the issues for COD and TN removal is to restrain the problems of side reactions of NH 4 + over-oxidation on anode and NO 3 − /NO 2 − over-reduction on cathode. Actually, many literatures indicate that the over-oxidation or over-reduction is a common phenomenon in the process of nitrogen-containing wastewater treatment by electrochemical method [ 24 , 25 , 26 ], which means that the TN removal is limited. For instance, Shih et al [ 27 ] studied the electrochemical performance of ammonia oxidation over a modified nickel foam electrode.…”

Section: Introductionmentioning

confidence: 99%

Process Optimization of Electrochemical Treatment of COD and Total Nitrogen Containing Wastewater

Yao

Jiang²,

Xia

2022

IJERPH

Self Cite

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In this work, an electrochemical method for chemical oxygen demand (COD) and total nitrogen (TN, including ammonia, nitrate, and nitrite) removal from wastewater using a divided electrolysis cell was developed, and its process optimization was investigated. This process could effectively relieve the common issue of NO3−/NO2− over-reduction or NH4+ over-oxidation by combining cathodic NO3−/NO2− reduction with anodic COD/NH4+ oxidation. The activity and selectivity performances toward pollutant removal of the electrode materials were investigated by electrochemical measurements and constant potential electrolysis, suggesting that Ti electrode exhibited the best NO3−/NO2− reduction and N2 production efficiencies. In-situ Fourier transform infrared spectroscopy was used to study the in-situ electrochemical information of pollutants conversion on electrode surfaces and propose their reaction pathways. The effects of main operating parameters (i.e., initial pH value, Cl− concentration, and current density) on the removal efficiencies of COD and TN were studied. Under optimal conditions, COD and TN removal efficiencies from simulated wastewater reached 92.7% and 82.0%, respectively. Additionally, reaction kinetics were investigated to describe the COD and TN removal. Results indicated that COD removal followed pseudo-first-order model; meanwhile, TN removal followed zero-order kinetics with a presence of NH4+ and then followed pseudo-first-order kinetics when NH4+ was completely removed. For actual pharmaceutical wastewater treatment, 79.1% COD and 87.0% TN were removed after 120 min electrolysis; and no NH4+ or NO2− was detected.

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Electrochemical removal of nitrate from wastewater with a Ti cathode and Pt anode for high efficiency and N2 selectivity

Cited by 35 publications

References 62 publications

Preparation of Co/Ti electrode by electro-deposition for aqueous nitrate reduction

Preparation of Co/Ti electrode by electro-deposition for aqueous nitrate reduction

A Zn–nitrite battery as an energy-output electrocatalytic system for high-efficiency ammonia synthesis using carbon-doped cobalt oxide nanotubes

Process Optimization of Electrochemical Treatment of COD and Total Nitrogen Containing Wastewater

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