Electrocatalytic cogeneration of reactive oxygen species for synergistic water treatment

Yang, So Young; Jeong, Hae Yong; Kim, Byeong-ju; Han, Dong Suk; Choi, Wonyong; Park, Hyunwoong

doi:10.1016/j.cej.2018.09.192

Cited by 12 publications

(3 citation statements)

References 41 publications

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“…• OH radicals can be generated on the TNA surface under PEC condition, , and single- and/or multielectron water electrochemical oxidation reactions occur at NSS (R1–R3). In the PEC process, anodic O 2 evolution reaction was inevitable at the high anode potential (+2.2 V vs NHE), which can improve the DO concentration in solution and enhance the cathodic oxygen reduction for H 2 O 2 generation to some extent. , For ACF cathode, the H 2 O 2 production reaction usually proceeds via an oxygen reduction reaction . At large overpotentials and under O 2 -diffusion-limited conditions, H 2 evolution reaction can occur competitively (R5).…”

Section: Resultsmentioning

confidence: 99%

Recovery of Phosphorus from Hypophosphite-Laden Wastewater: A Single-Compartment Photoelectrocatalytic Cell System Integrating Oxidation and Precipitation

Zhang

Zhao

Djellabi

2019

Environ. Sci. Technol.

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Recovery of phosphorus through precipitation from hypophosphite-laden wastewater is more difficult than from orthophosphate-laden wastewater because of the higher solubility of hypophosphite (H 2 PO 2 − ). Herein, a single-compartment photoelectrocatalytic (PEC) cell system consisting of a TiO 2 /Ni−Sb−SnO 2 bifunctional photoanode and an activated carbon fiber (ACF) cathode with dosing Fe 2+ ions was developed for recovery of phosphorus in the form of FePO 4 from hypophosphite-laden wastewater. In the PEC process, H 2 PO 2 − with an initial concentration of 1.0 mM was completely oxidized and recovered within 30 min at 3.0 V, and the pseudo-first-order rate constant of H 2 PO 2 − oxidation was ∼4 times than that in the electrocatalytic process and even ∼89 times than that in the photocatalytic process. The bifunctional photoanode can simultaneously generate • OH radicals and O 3 ; the ACF cathode can electrogenerate H 2 O 2 ; H 2 O 2 , O 3 , and the added Fe 2+ can interact with each other to produce • OH radicals and Fe 3+ ions. • OH radicals mainly from the Fenton process were responsible for oxidation of H 2 PO 2 − to PO 4 3− , which immediately combined with Fe 3+ to form FePO 4 at the optimized conditions to realize recovery of phosphorus. The long-term stability of this system was demonstrated. The efficiency for actual electroless nickel plating effluents was exhibited.

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Section: Resultsmentioning

confidence: 99%

Recovery of Phosphorus from Hypophosphite-Laden Wastewater: A Single-Compartment Photoelectrocatalytic Cell System Integrating Oxidation and Precipitation

Zhang

Zhao

Djellabi

2019

Environ. Sci. Technol.

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“…Figure 5 A shows the major lethal effects of ROS on bacteria and some strategies to scavenge ROS from PMES systems ( Figures 5 B–5D). An excellent option could be to use the in-situ generated ROS species as an strong oxidizing agent to degrade biorecalcitrant aromatics such as trichlorophenol, dinitrotoluene ( Yang et al., 2019 ; Sablas et al., 2020 ; Gonçalves et al., 2020 ) using “Intimate coupling of photocatalysis and biodegradation (ICPB)” method ( Marsolek et al., 2008 ). In the ICPB technique, biofilm is cultivated inside the cubic porous solid substrate while outside (exposed to the light) is covered with a thin layer of semiconductor materials ( Figure 5 B).…”

Section: Way Forwardmentioning

confidence: 99%

An insight into the bioelectrochemical photoreduction of CO2 to value-added chemicals

et al. 2021

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Summary Goal of sustainable carbon neutral economy can be achieved by designing an efficient CO 2 reduction system to generate biofuels, in particular, by mimicking the mechanism of natural photosynthesis using semiconducting nanomaterials interfaced with electroactive bacteria (EAB) in a photosynthetic microbial electrosynthesis (PMES) system. This review paper presents an overview of the recent advancements in the biohybrid photoanode and photocathode materials. We discuss the reaction mechanism observed at photoanode and photocathode to enhance our understanding on the solar driven MES. We extend the discussion by showcasing the potential activity of EABs toward high selectivity and production rates for desirable products by manipulating their genomic sequence. Additionally, the critical challenges associated in scaling up the PMES system including the strategies for diminution of reactive oxygen species, low solubility of CO 2 in the typical electrolytes, low selectivity of product species are presented along with the suggestions of alternative strategies to achieve economically viable generation of (bio)commodities.

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“…An alternative to reactive oxygen species, reactive chlorine species (RCSs, such as Cl 2 •– and HClO), are widely used in e AOPs. − The low potentials for the chloride oxidation reaction (ClOR; E °(Cl 2 /Cl – ) = 1.36 V and E °(HClO/Cl – ) = 1.48 V), and the wide availability of chloride in most aqueous environments (>0.3 mM) enhances the practical applicability of RCSs in the remediation of aquatic pollutants . The FEs for RCS production significantly depend on the physico-electrochemical characteristics of materials and the reaction conditions. ,− RCSs oxidize organic and inorganic substrates via direct chlorine addition and/or electron transfer. , Some chlorinated organic intermediates can be produced, whose mineralization needs to be completed prior to discharging.…”

Section: Introductionmentioning

confidence: 99%

Reactive Halogen Species-Mediated Electrocatalytic Oxidation of Arsenite(III)

2022

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Electrocatalytic advanced oxidation processes have long been considered among of the most viable ways to remediate aquatic contaminants, including As(III). Although direct electrochemical oxidation of As(III) is thermochemically facile, a high reaction rate is not easily achieved because of the competitive oxygen evolution reaction (OER), particularly at high potentials. This study examines the effect of three halides (Cl–, Br–, and I–) on the electrochemical oxidation of As(III) with nanoparticulate TiO2 electrodes in an aqueous bicarbonate solution at pH 8.7. The halides significantly enhance As(III) oxidation kinetics by >4, >8, and >20 times, respectively, under optimal conditions. Faradaic efficiencies of As(V) production (AsV–FEs) are also enhanced by a maximum of 10 times by the halides, even at high potentials at which the OER occurs. Pre-electrolysis of each halide solution produces reactive halogen species (ClO–, BrO–, and I3 –). As(III)-spiking of the pre-electrolyzed halide solutions allows simultaneous concentration changes at near-stoichiometric ratios (R 2 > 0.98) between each halogen species and As(V). Among the three halides, iodide imparts the strongest effect on As(III) oxidation owing to its lowest redox potential. Finally, technical considerations of reactive-halogen-species-mediated As(III) oxidation are discussed.

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Electrocatalytic cogeneration of reactive oxygen species for synergistic water treatment

Cited by 12 publications

References 41 publications

Recovery of Phosphorus from Hypophosphite-Laden Wastewater: A Single-Compartment Photoelectrocatalytic Cell System Integrating Oxidation and Precipitation

Recovery of Phosphorus from Hypophosphite-Laden Wastewater: A Single-Compartment Photoelectrocatalytic Cell System Integrating Oxidation and Precipitation

An insight into the bioelectrochemical photoreduction of CO2 to value-added chemicals

Reactive Halogen Species-Mediated Electrocatalytic Oxidation of Arsenite(III)

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