Simultaneous removal of ammonia and phosphate by electro-oxidation and electrocoagulation using RuO2–IrO2/Ti and microscale zero-valent iron composite electrode

Sun, Dongni; Hong, Xiaoting; Wu, Keming; Hui, Kwan San; Du, Yingying; Hui, Kwun Nam

doi:10.1016/j.watres.2019.115239

Cited by 97 publications

(30 citation statements)

References 48 publications

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“…3a and 3b). There are two main reasons for the decrease of N in the sediment and overlying water are: 1) the added RuO 2 -IrO 2 /Ti anode in the sediment could directly or indirectly oxidize NH 3 -N to N 2 in the sediment and overlying water; Direct electro-oxidation involves NH 3 -N adsorption onto the anode surface, as well as its direct electron transfer, and ultimately, its conversion into N 2 (Sun et al 2020). Indirect electro-oxidation of NH 3 -N when performed via anodic reaction forms an intermediate oxidant (e.g., Cl 2 , HOCl, and ClO − ) as the 2.17 V was the theoretical voltage which could produce Cl 2 , which would react with NO 2 − to NO 3 − and under the mole basic of 1.5 the N 2 could be produced and N 2 H 2 and NH 2 OH would be produced lower the mole basic of 1.5 (Snoeyink & Jenkins 1980;Kapałka et al 2010).…”

Section: Nitrogen Removal By Electrolysis In Sediment and Overlying Wmentioning

confidence: 99%

Electrolysis-Driven Bioremediation to Enhance Nitrogen and Phosphorus Removal From Polluted River Sediment

Zheng

et al. 2021

Preprint

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In order to testify the effect of electrolysis and microbial remediation technology in polluted river sediment. Here, we explored the possibility of electrochemically removing ammoniacal nitrogen-nitrogen (NH3-N), nitrate-nitrogen (NO3−-N) and phosphate ions-phosphorous (PO43−-P) by using a titanium (Ti) mesh cathode, a Ti/Ti dioxide (TiO2)/Ruthenium (IV) oxide (RuO2) (RuO2-IrO2/Ti) mesh, and a magnesium-aluminum (Mg–Al) alloy anode placed within the sediment and overlying water. Results showed that approximately 151.82 ± 21.69 mg TN was removed which was five times more effective than the non-electrolytic controls (30.21 ± 13.73 mg), NH3-N concentration in the sediment was substantially reduced (up to 2.9 times) compared to the non-electrolytic controls. Its efficiency lies in the electrolysis process, which may directly remove NH3-N through electrochemical oxidation and simultaneously produce oxygen which helps nitrifying bacteria to convert NH3-N into NO3−-N by the role of anode; and electrolysis may directly remove NO3−-N in the overlying water through electrochemical reduction while simultaneously producing hydrogen electron donor for hydrogen autotrophic microorganism as Hydrogenophohaga, to be the dominant species in sediment to enhance the removal of NO3−-N by the role of cathode. Electrolysis also reduced the PO43−-P through electro-coagulation since Mg2+ ions could also produce since sacrificial Mg–Al alloy anode was used and electro-deposition on Ti mesh cathode both to increase PO43−-P removal in overlying water and sediment. This study verifies the benefits of electrolysis-driven bioremediation as a sustainable technology for the bioremediation of N and P polluted river sediments.

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Section: Nitrogen Removal By Electrolysis In Sediment and Overlying Wmentioning

confidence: 99%

Electrolysis-Driven Bioremediation to Enhance Nitrogen and Phosphorus Removal From Polluted River Sediment

Zheng

et al. 2021

Preprint

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“…Several authors have investigated the degradation of organic contaminants on the IrO2 electrode alone or combined with other precursors (RuO2, Pt, etc.) [27][28][29] . However, there is no study on the effect of various inorganic ions on the degradation of amoxicillin on the IrO2/Ti electrode to our knowledge.…”

Section: Introductionmentioning

confidence: 99%

Electrooxidation of simulated wastewater containing pharmaceutical amoxicillin on thermally prepared IrO2/Ti

Appia

Ouattara²

2021

Mediterr.J.Chem.,

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The electrooxidation of amoxicillin (AMX) on the iridium oxide electrode thermally prepared (400°C) has been investigated by cyclic voltammetry and preparative electrolysis. Physical characterization by Scanning Electron Microscopy (SEM) showed that the IrO2 electrode has a rough surface with pores' presence. In cyclic voltammetry, the oxidation of AMX occurs directly at the anode's surface or via the higher degree oxide of iridium oxide (IrO3). It is noted that the oxidation process of AMX can be controlled by diffusion combined with the phenomenon of adsorption. In preparative electrolysis, the effect of several parameters has been investigated. These are the current density, the support medium, the initial pH. The findings obtained show a weak degradation of amoxicillin. The Chemical Oxygen Demand (COD) reduction rate is less than 11% under our experimental conditions, indicating that the IrO2 electrode leads to the parent compound's conversion. Also, the degradation of the organic compound is favored in a very acidic medium.Furthermore, the effect of inorganic ions such as SO42-, PO43-, NO3-, Cl- was evaluated. Investigations show that these ions' effects are diverse, with COD reduction rates ranging from 2.47%; 2.68%; 7.7%; 16.41%, and 71.65%, respectively, in the absence and the presence of SO42-, PO43-, NO3-, Cl- ions. SO42- have virtually no effect on enhancing the degradation of amoxicillin. PO43- ions provide a slight improvement in amoxicillin degradation. As for nitrate ions, their influence is 2.31 times that of phosphate ions. Chloride ions improve the performance of the electrooxidation of amoxicillin on IrO2 very significantly. The presence of chloride ions makes it possible to go from 2928.35 (absence of inorganic ions) to 33.19 kWh per Kg of COD. This represents an energy gain of over 98%.

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“…Although these unique properties, magnetic Fe0 tends to agglomeration due to high surface energy and superparamagnetic properties in wastewater medium [17]. To overcome these drawbacks, magnetic Fe 0 NPs combined with various materials like metal oxide [18][19][20], conductive polymers [21][22][23] .…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic degradation of malachite green dye using zero valent iron doped polypyrrole

Taymaz

Kamış

Yoldaş³

2021

Environmental Engineering Research

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The zero valent iron doped polypyrrole (Ppy/Fe) was synthesized via chemical oxidative polymerization method in diethylene glycol medium for the first time in this study. The characterization of synthesized Ppy and Ppy/Fe composites was realized by using fourier transform infrared spectrometer (FTIR), UV-visible diffuse reflectance spectrometer (DRS), scanning electron microscope (SEM), elemental dispersion X-ray analysis (EDX), four point probe electrical conductivity X-Ray diffraction spectroscopy (XRD) and pH at point of zero charge (pHpzc) methods. These characterizations show that there is an interaction between zero valent iron (Fe0) and Ppy polymer. The photocatalytic activity of synthesized Ppy and Ppy/Fe composite were investigated by degradation of malachite green (MG) dye under UV light irradiation. Ppy/Fe composite was achieved complete degradation within 60 min, which is 5.92 times faster than pure Ppy. The effect of irradiation time, ratio of Ppy and Fe0 in the synthesized composites, photocatalyst amount to photocatalytic efficiency of Ppy/Fe is studied. Also, the photocatalytic stability of Ppy/Fe is investigated under UV light illumination for degradation MG dye.

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Simultaneous removal of ammonia and phosphate by electro-oxidation and electrocoagulation using RuO2–IrO2/Ti and microscale zero-valent iron composite electrode

Abstract: Simultaneous removal of ammonia and phosphate by electro-oxidation and electrocoagulation using RuO 2 -IrO 2 /Ti and microscale zero-valent iron composite electrode,

Cited by 97 publications

References 48 publications

Electrolysis-Driven Bioremediation to Enhance Nitrogen and Phosphorus Removal From Polluted River Sediment

Electrolysis-Driven Bioremediation to Enhance Nitrogen and Phosphorus Removal From Polluted River Sediment

Electrooxidation of simulated wastewater containing pharmaceutical amoxicillin on thermally prepared IrO2/Ti

Photocatalytic degradation of malachite green dye using zero valent iron doped polypyrrole

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