One-Step Treatment of Phosphite-Laden Wastewater: A Single Electrochemical Reactor Integrating Superoxide Radical-Induced Oxidation and Electrocoagulation

Liang, Sheng; Zheng, Weiye; Zhu, Lei; Duan, Weijian; Wei, Chaohai; Feng, Chunhua

doi:10.1021/acs.est.9b00841

Cited by 69 publications

(47 citation statements)

References 45 publications

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“…The detection limit was calculated to be 1.46 μM P(III) based on 3σ/slope (σ is the standard deviation of the samples without P(III), see the inset of Figure B). This is comparable with some previous methods for detecting P(III), such as ion chromatography (0.39 μM), high-performance liquid chromatography (0.04 μM), and spectrophotometry (0.7 and 290.3 μM). The relative standard deviation for the fluorescence intensity of 50 μM phosphite was about 5.8%, suggesting good reproducibility of this sensing strategy.…”

Section: Resultssupporting

confidence: 87%

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Highly Selective Fluorescent Sensing of Phosphite through Recovery of Poisoned Nickel Oxide Nanozyme

Chang

Liu

2020

Anal. Chem.

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Phosphorus is a key element responsible for eutrophication, and its measurement and speciation is a critical topic in analytical chemistry. Most research efforts have been devoted to detecting phosphate (P(V)), while few reports on phosphite (P(III)) are available, making it difficult for sensor-based understanding of the phosphorus cycle. This study presents a fluorescent “turn-on” sensor for quantitative and highly selective analysis of phosphite based on the different coordination strength of N and P lone-pair electrons toward nickel oxide (NiO). A few N-containing compounds (mainly Good’s buffers) were screened as inhibitors for the oxidase-like activity of NiO nanoparticles for the oxidation of Amplex red (AR). HEPES was found to be most effective for inhibiting the formation of fluorescent resorufin, the oxidation product of AR. Among various phosphorus-, arsenic-, selenium-, and sulfur-containing species, along with various cations, phosphite was the only one that could restore the activity, likely due to its stronger affinity with the surface, and it is not an inhibitor. Under the optimum condition, the sensor detected P(III) up to 1 mM with a detection limit of 1.46 μM. The phosphite analysis with recovery rates ranged from 74.2 ± 2.6% to 107.5 ± 0.5% in real water and biological samples, suggesting the potential applicability of this sensor.

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Section: Resultssupporting

confidence: 87%

“…Phosphite is widely used in commercial products, such as biostimulants, fungicides, , and organophosphorous pesticides. More and more phosphite-rich wastewaters are discharged, and phosphite has been found in natural geothermal pools, drinking water, lakes, − and industrial wastewater − at concentrations from micro- to millimolar levels.…”

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confidence: 99%

Highly Selective Fluorescent Sensing of Phosphite through Recovery of Poisoned Nickel Oxide Nanozyme

Chang

Liu

2020

Anal. Chem.

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“…Oxidation induced by Fe(II)–O 2 interactions in Fe EC has been predominantly attributed to the reactive oxidants of ferryl (i.e., Fe(IV), eq ) or O 2 •– in previous studies. ,, For example, most researchers agree that Fe(IV) was the key reactive species for As(III) oxidation in Fe EC; ,,, van Genuchten et al proposed that O 2 •– and Fe(IV) were responsible for Mn(II) oxidation under near neutral conditions, and Liang et al recently ascribed phosphite oxidation to O 2 •– through scavenging experiments . Because of the moderate oxidizing ability of Fe(IV) (standard reduction potential of Fe(IV)/Fe(III): ∼2.0 V/SHE) and O 2 •– (standard reduction potential of O 2 •– /H 2 O 2 : ∼0.9 V/SHE), it is not surprising that the reported oxidizing impact in Fe EC systems was constrained to the inorganic contaminants (i.e., As(III), Mn(II), P(III)) that are liable to oxidize.…”

Section: Introductionmentioning

confidence: 99%

Oxidizing Capacity of Iron Electrocoagulation Systems for Refractory Organic Contaminant Transformation

Qian

Yuan

Xie

et al. 2019

Environ. Sci. Technol.

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Iron electrocoagulation (Fe EC) is normally considered as a separation process. Here, we found that Fe(II)–O2 interactions in Fe EC systems could produce reactive oxidants, mainly hydroxyl radicals (•OH), for refractory organic contaminant transformation. Production of reactive oxidants, probed by benzoate conversion to p-hydroxybenzoic acid (p-HBA), depended on dissolved oxygen (DO) concentration and Fe(II) speciation. Measurable levels of DO were required for significant p-HBA production. Fe precipitates evolved from lepidocrocite to magnetite when DO decreased to below the detection limit. Both experiments and kinetic modeling suggest that the main Fe(II) species contributing to reactive oxidants (mainly •OH) production changed from aqueous Fe(II) initially to lepidocrocite-sorbed Fe(II) with progressive precipitates formation. When DO was not measurable at high currents (≥50 mA or 100 mA/L), reactive oxidant production was ineffective because of pH rise and Fe(II) preservation in magnetite, but it could be enhanced drastically by aeration. The reactive oxidants produced at 30 mA (or 60 mA/L) could degrade about 47% of 10 μM aniline and 34% of sulfanilamide within 6 h of Fe EC treatment. Our findings highlight the importance of reactive oxidants for refractory organic contaminants oxidation in Fe EC systems.

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“…Even though the treatment of non-ortho P generally requires more energy, the electricity demand could be reduced by combining (bio)electrochemical systems with other technologies, such as photocatalysis (Liang et al, 2019;Zhang et al, 2021;Zhang et al, 2019b). Therefore, it is economically possible to include EMP in the current wastewater-treatment system for removing and recovering P. However, the existing studies on the economic evaluation of the EMP of P minerals mainly consider energy (electricity) consumption, while other costs for scale-up systems, such as electrode materials, reactor materials, and maintenance cost, are not taken into consideration.…”

Section: Tablementioning

confidence: 99%

Electrochemically mediated precipitation of phosphate minerals for phosphorus removal and recovery: Progress and perspective

Wang

Kuntke

Saakes³

et al. 2022

Water Research

118

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Phosphorus (P) is an essential element for the growth and reproduction of organisms. Unfortunately, the natural P cycle has been broken by the overexploitation of P ores and the associated discharge of P into water bodies, which may trigger the eutrophication of water bodies in the short term and possible P shortage soon. Consequently, technologies emerged to recover P from wastewater to mitigate pollution and exploit secondary P resources. Electrochemically induced phosphate precipitation has the merit of achieving P recovery without dosing additional chemicals via creating a localized high pH environment near the cathode. We critically reviewed the development of electrochemically induced precipitation systems toward P removal and recovery over the past ten years. We summarized and discussed the effects of pH, current density, electrode configuration, and water matrix on the performance of electrochemical systems. Next to ortho P, we identified the potential and illustrated the mechanism of electrochemical P removal and recovery from non-ortho P compounds by combined anodic or anode-mediated oxidation and cathodic reduction (precipitation). Furthermore, we assessed the economic feasibility of electrochemical methods and concluded that they are more suitable for treating acidic P-rich waste streams. Despite promising potentials and significant progress in recent years, the application of electrochemical systems toward P recovery at a larger scale requires further research and development. Future work should focus on evaluating the system's performance under long-term operation, developing an automatic process for harvesting P deposits, and performing a detailed economic and life-cycle assessment.

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One-Step Treatment of Phosphite-Laden Wastewater: A Single Electrochemical Reactor Integrating Superoxide Radical-Induced Oxidation and Electrocoagulation

Cited by 69 publications

References 45 publications

Highly Selective Fluorescent Sensing of Phosphite through Recovery of Poisoned Nickel Oxide Nanozyme

Highly Selective Fluorescent Sensing of Phosphite through Recovery of Poisoned Nickel Oxide Nanozyme

Oxidizing Capacity of Iron Electrocoagulation Systems for Refractory Organic Contaminant Transformation

Electrochemically mediated precipitation of phosphate minerals for phosphorus removal and recovery: Progress and perspective

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