The improvement on total nitrogen removal in nitrate reduction by using a prepared CuO–Co3O4/Ti cathode

Yang, Manshu; Wang, Juntian; Shuang, Chendong; Li, Aimin

doi:10.1016/j.chemosphere.2020.126970

Cited by 41 publications

(27 citation statements)

References 38 publications

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“…The analysis of nitrate, nitrite, ammonia and total nitrogen are described in the previous work (Yang et al 2020). Briefly, the ion chromatography method was applied for nitrate and nitrite measurement.…”

Section: Methodsmentioning

confidence: 99%

“…The Ru-IrO 2 /Ti electrode was used in electrolysis and a saturated calomel electrode (SCE) was used as a counter and reference electrode, respectively. The scan rate was 20 mV s -1 , and the scan range was -1.2-0 V. The instruments were the same and the operation parameter was similar to that in our previous work with the scan rate of 20 mV s -1 between -1.2 and 0 V (Yang et al 2020). For the mechanical stability test of different cathodes prepared under different conditions, ultrasonic interference was carried out in a CNC ultrasonic cleaner (KH-300DE, Kunshan-Hechuang Co. Ltd (JiangSu, China) at 100 KHz.…”

Section: Characterization and Testmentioning

confidence: 99%

“…The aim of this work was to prepare a cathode by the electroplating method for improving the stability to remove aqueous nitrate. A Ti plate was used as substrate due to its excellent performance for nitrate reduction with Co 3 O 4 attachment (Su et al 2017;Yang et al 2020). The prepared Co/Ti electrode was evaluated on its damage performance and nitrate removal behavior comparing with the Co 3 O 4 /Ti fabricated by thermal decomposition, and the possible nitrate reduction mechanism of the Co/Ti electrode was proposed.…”

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confidence: 99%

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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: Methodsmentioning

confidence: 99%

Section: Characterization and Testmentioning

confidence: 99%

mentioning

confidence: 99%

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

Jiang

Han

Wang

et al. 2021

Journal of Water Reuse and Desalination

Self Cite

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“…144 Apart from the iron-containing catalysts, Cu-based composites also demonstrated unique advantages for the nitrate reduction reaction. 145,146 For example, a nanosized composite that consists of monodisperse Cu nanoparticles and reduced graphene oxide (rGO) has been used as the catalyst for electroreduction of nitrate (Figure 11C). This composite catalyst delivered a nitrate removal rate of approximately 96.8%, which was several times higher than GP (~23.27%) and Cu/GP (~82.79%) electrodes.…”

Section: Electrocatalytic Nitrate Reductionmentioning

confidence: 99%

“…Apart from the iron‐containing catalysts, Cu‐based composites also demonstrated unique advantages for the nitrate reduction reaction 145,146 11C).…”

Section: Conversion Between Nitrogen and Nitrogen Oxidesmentioning

confidence: 99%

Rational design on photo(electro)catalysts for artificial nitrogen looping

Liu

Wang

et al. 2021

EcoMat

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Nitrogen, one of most important elements on the Earth, plays an essential role in shaping the modern society. The natural nitrogen looping, however, is insufficient to satisfy the high demand of the large-scale human activities. To achieve a more sustainable and efficient utilization of nitrogen, artificial nitrogen looping by photo(electro)catalytic processes has been considered as a feasible strategy. In this context, the rational design on the high-performance catalysts for nitrogen looping becomes increasingly important and urgent. On this basis, herein, we provide a timely review on the recent progress, achievements, and essential challenges for the artificial nitrogen looping process, mainly including photo(electro)catalytic transformations among dinitrogen, ammonia, gaseous nitrogen oxides, nitrate, and so on. Especially, the photo(electro)catalysts used in various reactions involved in nitrogen looping, including nitrogen reduction reaction, nitrogen oxidation reaction, ammonia oxidation reaction, ammonia decomposition reaction, etc., are systematically introduced. Finally, we hope that this review will help us deepen the understanding of nitrogen looping-related photo(electro)catalysts, and further pave a way toward the sustainable development on energy and environment. K E Y W O R D Senvironmental protection, nitrogen looping, photo(electro)catalysis, sustainable energy Mengying Li and Xiaoqing Liu contributed equally to this study.

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Coordination Symmetry Breaking of Single‐Atom Catalysts for Robust and Efficient Nitrate Electroreduction to Ammonia

Cheng

et al. 2022

Advanced Materials

155

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Nitrate electrocatalytic reduction (NO3RR) for ammonia production is a promising strategy to close the N‐cycle from nitration contamination, as well as an alternative to the Haber–Bosch process with less energy consumption and carbon dioxide release. However, current long‐term stability of NO3RR catalysts is usually tens of hours, far from the requirements for industrialization. Here, symmetry‐broken Cusingle‐atom catalysts are designed, and the catalytic activity is retained after operation for more than 2000 h, while an average ammonia production rate of 27.84 mg h−1 cm−2 at an industrial level current density of 366 mA cm−2 is achieved, obtaining a good balance between catalytic activity and long‐term stability. Coordination symmetry breaking is achieved by embedding one Cu atom in graphene nanosheets with two N and two O atoms in the cis‐configuration, effectively lowering the coordination symmetry, rendering the active site more polar, and accumulating more NO3− near the electrocatalyst surface. Additionally, the cis‐coordination splits the Cu 3d orbitals, which generates an orbital‐symmetry‐matched π‐complex of the key intermediate *ONH and reduces the energy barrier, compared with the σ‐complex generated with other catalysts. These results reveal the critical role of coordination symmetry in single‐atom catalysts, prompting the design of more coordination‐symmetry‐broken electrocatalysts toward possible industrialization.

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The improvement on total nitrogen removal in nitrate reduction by using a prepared CuO–Co3O4/Ti cathode

Cited by 41 publications

References 38 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

Rational design on photo(electro)catalysts for artificial nitrogen looping

Coordination Symmetry Breaking of Single‐Atom Catalysts for Robust and Efficient Nitrate Electroreduction to Ammonia

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