Autocatalytic degradation of perfluorooctanoic acid in a permanganate-ultrasonic system

Hu, Yibo; Lo, Shang‐Lien; Li, Yueh-Feng; Lee, Yu‐Chi; Chen, Mengjia; Lin, Jen-Jia

doi:10.1016/j.watres.2018.04.044

Cited by 53 publications

(14 citation statements)

References 73 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Table S6 shows that the G 50 value of the NPDW/MBs−air system was 2.4−3.5 times that of some photocatalysis system 66−68 and ∼3.3 times those of a microwave system 69 and an ultrasonic electrochemical system, 70 indicating that NPDW/MBs treatment is superior to some of the alternative techniques. The energy consumption (EE/O) of these systems also supports the conclusion, with the EE/O of NPDW/MBs (331.95 kWh/m 3 in the air atmosphere and 216.49 kWh/m 3 in the Ar atmosphere) lower than those of photocatalysis (2666.7 kWh/m 3 ), 67 microwave (3584.0 kWh/ m 3 ), 69 permanganate-ultrasonic (531.69 kWh/m 3 ), 71 and ultrasonic electrochemical (3678.2 kWh/m 3 ) systems. 70 Among the different plasma systems, the G 50 values of the NPDW/MBs in the air and Ar atmospheres are 4.5 and 2.2 times higher than DC plasma in O 2 bubbles 72 and Ar bubbles, 27 respectively, while the EE/O are only 0.16 and 0.30 times that of the latter.…”

Section: ■ Results and Discussionsupporting

confidence: 69%

Enhancing Interface Reactions by Introducing Microbubbles into a Plasma Treatment Process for Efficient Decomposition of PFOA

Zhang

et al. 2021

Environ. Sci. Technol.

100

View full text Add to dashboard Cite

Efficient destruction of perfluoroalkyl compounds in contaminated waters remains a challenge because of highly stable C–F bonds. In this study, mineralization of perfluorooctanoic acid (PFOA) with high concentration (∼30 mg/L) was realized in a needle–plate pulsed discharge reactor integrated with a water jet (NPDW) to which microbubbles (MBs) with different carrier gases (air, N2, and Ar) were introduced to enhance interfacial reactions. MBs effectively enrich dispersed PFOA from a bulk solution to a liquid surface to allow enhancing contact with reactive species and also expanding the plasma discharge area and channels. The PFOA removal efficiency in air and Ar discharge reached 81.5 and 95.3% in 2 h, respectively, with a defluorination ratio of no less than 50%. Energy requirements (EE/O) ranged from 216.49 to 331.95 kWh/m3. Aside from fluoride, PFOA was degraded to a range of short-chain perfluoroalkyl acids and, to a minor extent, at least 20 other fluorinated transformation products. PFOA degradation mechanisms were proposed, including decarboxylation, hydroxylation, hydrogenation reduction, and defluorination reactions. Real water matrices (groundwater, tap water, wastewater effluent, and surface water) showed moderate impact on treatment outcomes, demonstrating the robustness of the treatment process. The study demonstrated an environmentally friendly nonthermal plasma technology for effective PFOA degradation.

show abstract

Section: ■ Results and Discussionsupporting

confidence: 69%

Enhancing Interface Reactions by Introducing Microbubbles into a Plasma Treatment Process for Efficient Decomposition of PFOA

Zhang

et al. 2021

Environ. Sci. Technol.

100

View full text Add to dashboard Cite

show abstract

“…This energy consumption is among the lowest reported in the literature (prior electrochemical [10–1500 kWh mol −1 F − ], microwave [4200 kWh mol −1 F − ], UV [450–2000 kWh mol −1 F − ], and ultrasonic [250–4200 kWh mol −1 F − ]). [ 20b,21 ] The significantly lower energy consumption can be attributed to the high defluorination efficiency, combined with the tuning of redox‐potential through the P(TMA 51 ‐ co ‐TMPMA 49 )‐CNT electrode. Our consideration in the energy aspect demonstrates the possibility of using P(TMA x ‐ co ‐TMPMA 1− x )‐CNT as not only a cost‐effective electrochemically‐mediated adsorbent, but also a sustainable counter electrode enabling energy‐efficient, tandem degradation of PFOA, providing a unique pathway for next‐generation, energy‐integrated water purification devices.…”

Section: Resultsmentioning

confidence: 99%

Molecular Tuning of Redox‐Copolymers for Selective Electrochemical Remediation

Kim

Medina

Elbert

et al. 2020

Adv Funct Materials

View full text Add to dashboard Cite

Molecular design of redox-materials provides a promising technique for tuning physicochemical properties which are critical for selective separations and environmental remediation. Here, the structural tuning of redox-copolymers, 4-methacryloyloxy-2,2,6,6-tetramethylpiperidin-1-oxyl (TMA) and 4-methacryloyloxy-2,2,6,6-tetramethylpiperidine (TMPMA), denoted as P(TMA x-co-TMPMA 1−x), is investigated for the selective separation of anion contaminants ranging from perfluorinated substances to halogenated aromatic compounds. The amine functional groups provide high affinity toward anionic functionalities, while the redox-active nitroxyl radical groups promote electrochemically-controlled capture and release. Controlling the ratio of amines to nitroxyl radicals provides a pathway for tuning the redox-activity, hydrophobicity, and binding affinity of the copolymer, to synergistically enhance adsorption and regeneration. P(TMA x-co-TMPMA 1−x) removes a model perfluorinated compound (perfluorooctanoic acid (PFOA)) with a high uptake capacity (>1000 mg g −1) and separation factors (500 vs chloride), and demonstrates exceptional removal efficiencies in diverse perand polyfluoroalkyl substances (PFAS) and halogenated aromatic compounds, in various water matrices. Integration with a boron-doped diamond electrode allows for tandem separation and destruction of pollutants within the same electrochemical cell, enabling the energy integration of the separation step with the catalytic degradation step. The study demonstrates for the first time the tuning of redox-copolymers for selective remediation of organic anions, and integration with an advanced electrochemical oxidation process for energy-efficient water purification.

show abstract

“…Some advanced oxidation processes (AOPs) in critical conditions have been developed to degrade PFOA. The noticeable treatment technologies are either photo-based approaches, such as: photolysis, photochemical and photocatalysis [7][8][9][10][11] sonochemical treatment [12][13][14][15] or microwavehydrothermal treatment [16][17]. The key factor in these treatment reactions are one-electron oxidants such as persulfate [8][9][10][11][12][13][14][15][16] periodate [10], or photocatalysts such as heteropolyacid [7], TiO2 [9,11], have been used to decompose PFCAs under UV-irradiation.…”

Section: Introductionmentioning

confidence: 99%

Degradation of perfluorooctanoic acid in aqueous solution with sulfate radicals generated in the UV/sodium sulfate system

Tuan¹,

Thi²,

Pham³

2021

VNJHM

View full text Add to dashboard Cite

Perfluorooctanoic acid (C7F15COOH, PFOA) is a persisted organic pollutant widely used in industry in recently. It is widespread occurrence in the environment and because of its ability to bioaccumulate. PFOA is reported toxic and carcinogenic to animals such as rats, fishes, monkeys, and even humans. Photodegradation PFOA solution in presence Na2SO4 was studied in this study. PFOA was photodegraded about 93% after 24 h by using a combination of UV 254nm irradiation and Na2SO4 30mM, while under only UV irradiation, 43% of PFOA was photodegraded. Na2SO4 30mM was the concentration that photodegradation PFOA reached highest efficiency. The optimal temperature for PFOA degradation is 25 o C.

show abstract

Autocatalytic degradation of perfluorooctanoic acid in a permanganate-ultrasonic system

Cited by 53 publications

References 73 publications

Enhancing Interface Reactions by Introducing Microbubbles into a Plasma Treatment Process for Efficient Decomposition of PFOA

Enhancing Interface Reactions by Introducing Microbubbles into a Plasma Treatment Process for Efficient Decomposition of PFOA

Molecular Tuning of Redox‐Copolymers for Selective Electrochemical Remediation

Degradation of perfluorooctanoic acid in aqueous solution with sulfate radicals generated in the UV/sodium sulfate system

Contact Info

Product

Resources

About