Electrochemical conversion of ammonia to nitrogen in non-chlorinated aqueous solution by controlling pH value

Yao, Jiachao; Zhou, Mingming; Wen, Danni; Xue, Qinwen; Wang, Jiade

doi:10.1016/j.jelechem.2016.06.040

Cited by 53 publications

(23 citation statements)

References 32 publications

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“…NH 4 + represents a common contaminant in nitrogenous wastewater and the widely accepted mechanism for removing NH 4 + in wastewater is the electrochemical oxidation during the electrocatalysis [21]. The ·OH can efficiently oxidize the NH 4 + into N 2 on the anode.…”

Section: Introductionmentioning

confidence: 99%

RETRACTED: SrFexNi1−xO3−δ Perovskites Coated on Ti Anodes and Their Electrocatalytic Properties for Cleaning Nitrogenous Wastewater

et al. 2019

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Perovskites (ABO3), regarded as the antioxidative anode materials in electrocatalysis to clean nitrogenous wastewater, show limited oxygen vacancies and conductivity due to their traditional semiconductor characteristic. To further improve the conductivity and electrocatalytic activity, the ferrum (Fe) element was first doped into the SrNiO3 to fabricate the SrFexNi1−xO3−δ perovskites, and their optimum fabrication conditions were determined. SrFexNi1−xO3−δ perovskites were coated on a titanium (Ti) plate to prepare the SrFexNi1−xO3−δ/Ti electrodes. Afterward, one SrFexNi1−xO3−δ/Ti anode and two stainless steel cathodes were combined to assemble the electrocatalytic reactor (ECR) for cleaning simulated nitrogenous wastewater ((NH4)2SO4 solution, initial total nitrogen (TN) concentration of 150 mg L−1). Additionally, SrFexNi1−xO3−δ materials were characterized using Fourier Transform Infrared (FT-IR), Raman spectra, X-Ray Diffraction (XRD), Energy Dispersive X-ray (EDX), Electrochemical Impedance Spectroscopy (EIS) and Tafel curves, respectively. The results indicate that SrFexNi1−xO3−δ materials are featured with the perovskite crystal structure and Fe is appreciably doped into SrNiO3. Moreover, the optimum conditions for fabricating SrFexNi1−xO3−δ were the reaction time of 120 min for citrate sol-gel, a calcination temperature of 700 °C, and Fe doping content of x = 0.3. SrFe0.3Ni0.7O2.85, and perovskite performs attractive electrocatalytic activity (TN removal ratio of 91.33%) and ECR conductivity of 3.62 mS cm−1 under an electrocatalytic time of 150 min. Therefore, SrFexNi1−xO3−δ perovskites are desirable for cleaning nitrogenous wastewater in electrocatalysis.

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Section: Introductionmentioning

confidence: 99%

RETRACTED: SrFexNi1−xO3−δ Perovskites Coated on Ti Anodes and Their Electrocatalytic Properties for Cleaning Nitrogenous Wastewater

et al. 2019

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“…The generated Cl 2(aq) might escape into the atmosphere, leading to the reduction of active chlorine which could oxidize ammonia in acidic conditions. Besides, our previous work had determined that ammonia could be removed via direct electron transfer on Ti/PbO 2 in a wide pH range, but is weakest in neutral conditions [31].…”

Section: Resultsmentioning

confidence: 99%

“…According to the oxygen evolution potential, removal efficiency of pollutants, and electrode life, Ti/PbO 2 shows an excellent ability on oxidation of ammonia and organics. Another aspect of our work [31] has shown that Ti/PbO 2 has high catalytic activity for oxidizing ammonia in simulated wastewater via direct and indirect oxidation. Thus, Ti/PbO 2 is selected as the experimental anode in this study.…”

Section: Methodsmentioning

confidence: 99%

“…The electrochemical oxidation system for ammonia removal mainly consisted of a 0.4 L reaction cell, a water bath, DC power supply, reservoir, and gas collection device, as shown in our previous work [31]. The reaction cell was a single-compartment electrochemical cell containing a Ti/PbO 2 anode and Ti cathode (Baoji Special Metals Co., Ltd., Baoji, China).…”

Section: Methodsmentioning

confidence: 99%

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Process Optimization of Electrochemical Oxidation of Ammonia to Nitrogen for Actual Dyeing Wastewater Treatment

Yao

Xia

et al. 2019

IJERPH

Self Cite

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To mitigate the potential environmental risks caused by nitrogen compounds from industrial wastewater, residual ammonia after conventional wastewater treatment should be further eliminated. In this work, an electrochemical oxidation process for converting ammonia to nitrogen in actual dyeing wastewater was investigated. The effects of the main operating parameters, including initial pH value, applied current density, NaCl concentration, and flow, were investigated on ammonia removal and products distribution. Experimental results indicated that, under optimal conditions of an initial pH value of 8.3, applied current density of 20 mA cm−2, NaCl concentration of 1.0 g L−1, and flow of 300 mL min−1, the ammonia could be completely removed with N2 selectivity of 88.3% in 60 min electrolysis. A kinetics investigation using a pseudo-first-order model provided a precise description of ammonia removal during the electro-oxidation process. Experimental functions for describing the relationships between kinetic constants of ammonia removal and main operating parameters were also discussed. Additionally, the mechanisms and economic evaluation of ammonia oxidation were conducted. All these results clearly proved that this electro-oxidation process could efficiently remove ammonia and achieve high N2 selectivity.

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“…Nowadays, numerical research regarding ammonia electrooxidation focused on the optimization of the operation parameters (Yao, Zhou, Wen, Xue, & Wang, 2016), reactor design and electrode materials (Dong et al., 2016; Liu, Liu, et al, 2019; Su, Kuan, Liu, & Huang, 2019), and the development of combined processes (Chauhan & Srivastava, 2019; Deng, Chen, Feng, Wang, et al, 2019; Klidi et al., 2018; Li, Peng, et al, 2019; Li, Bai, et al, 2019; Zhang, Li, et al, 2018). The kinetic model and rate constants of chlorine‐mediated ammonia oxidation have also been reported and presented (Zhang, He, et al, 2018; Zhang, Li, et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Simulation and prediction of electrooxidation removal of ammonia and its application in industrial wastewater effluent

Ding

Gao

Wang

et al. 2020

Water Environment Research

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A FLUENT software able to predict and assess the electrooxidation of ammonia from the simulation of ammonia concentration and flow field distribution was developed in this study. The flow field-based models of ammonia removal were simulated and modified through the experimental results. The parameter of reaction constant k is corrected to 0.00195, and the modified model fitted well with experimental values, with the error less than 4%. The electrode depth of 4 cm was assessed to be optimal for ammonia removal based on the comparison of the simulation results on ammonia concentration and flow field distribution. The prediction result applied in the industrial wastewater treatment indicated that complete could be achieved at 0.27 Ah/L, and about 50% of total nitrogen was removed at 0.8 Ah/L. About 7% of chloride ions were converted into inorganic by-products, indicating low biological toxicity and risk on environment. The energy consumption increased with the promotion of removal efficiency of total nitrogen, requiring 5.4 kWh/m 3 to remove 50% total nitrogen at 0.8 Ah/L. The results show the practicability and feasibility of this FLUENT software tool on the simulation and prediction of electrooxidation process, which can provide the simulation parameter settings for the subsequent application. © 2020 Water Environment Federation • Practitioner points • A FLUENT software based on the simulation of ammonia concentration and flow field distribution was able to predict and assess ammonia electrooxidation. • A modified model is provided with a rate constant k of 0.00195 and the distinction of 4% with experimental results. • The optimal electrode depth was predicted to be 4 cm via the obtained model. • Complete ammonia and about 50% of total nitrogen could be at 0.27 Ah/L and 0.8 Ah/L, receptively. • About 7% of chloride ions were converted into inorganic by-products in industrial wastewater with high chloride.

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Electrochemical conversion of ammonia to nitrogen in non-chlorinated aqueous solution by controlling pH value

Cited by 53 publications

References 32 publications

RETRACTED: SrFexNi1−xO3−δ Perovskites Coated on Ti Anodes and Their Electrocatalytic Properties for Cleaning Nitrogenous Wastewater

RETRACTED: SrFexNi1−xO3−δ Perovskites Coated on Ti Anodes and Their Electrocatalytic Properties for Cleaning Nitrogenous Wastewater

Process Optimization of Electrochemical Oxidation of Ammonia to Nitrogen for Actual Dyeing Wastewater Treatment

Simulation and prediction of electrooxidation removal of ammonia and its application in industrial wastewater effluent

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