Enhanced perfluorooctanoic acid degradation by electrochemical activation of peroxymonosulfate in aqueous solution

Wang, Kaixuan; Huang, Dahong; Wang, Weilai; Ji, Yangyuan; Niu, Junfeng

doi:10.1016/j.envint.2020.105562

Cited by 73 publications

(11 citation statements)

References 64 publications

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“…Through the introduction of ESR signal acquisition software, simulation analysis was conducted according to the hyperfine coupling constant of DMPO-˙OH and DMPO-SO 4 ˙ − (DMPO-˙OH: α N = 14.9 G, α H = 14.9 G ( g -factor of 2.009); DMPO-SO 4 ˙ − : α N = 13.2 G, α H = 9.6 G, α H = 1.48 G and α H = 0.78 G). 26–28 The results showed the typical quartet lines of DMPO-˙OH admixture (with a peak intensity ratio of 1 : 2 : 2 : 1) and the typical sextet lines of DMPO-SO 4 ˙ − (with a peak intensity ratio of 1 : 1 : 1 : 1 : 1 : 1), indicating that both ˙OH and SO 4 ˙ − were produced in the process of electro-preparation of PDS by sulfate at BDD anode. According to the estimation based on the absolute height of peak intensity, the output of ˙OH in the transient state was much larger than that of SO 4 ˙ − .…”

Section: Resultsmentioning

confidence: 93%

“…. [26][27][28] The results showed the typical quartet lines of DMPO-cOH admixture (with a peak intensity ratio of 1 : 2 : 2 : 1) and the typical sextet lines of DMPO-SO 4 c À (with a peak intensity ratio of 1 : 1 : 1 : 1 : 1 : 1), indicating that both cOH and SO 4 c À were produced in the process of electro-preparation of PDS by sulfate at BDD anode. According to the estimation based on the absolute height of peak intensity, the output of cOH in the transient state was much larger than that of SO 4 c À .…”

Section: Curve Of Bdd Anode In Sulfatementioning

confidence: 91%

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Research on the mechanism and reaction conditions of electrochemical preparation of persulfate in a split-cell reactor using BDD anode

2020

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Section: Resultsmentioning

confidence: 93%

Section: Curve Of Bdd Anode In Sulfatementioning

confidence: 91%

Research on the mechanism and reaction conditions of electrochemical preparation of persulfate in a split-cell reactor using BDD anode

2020

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“…The · OH production rate normalized by per unit mass of the catalyst ( k cat, · OH ) on the CoFe DAC is 2.4 mmol L –1 min –1 g cat –1 , which is higher than Co-NCs (0.8 mmol L –1 min –1 g cat –1 ), Fe-NCs (1.0 mmol L –1 min –1 g cat –1 ), and NCs (0.7 mmol L –1 min –1 g cat –1 ) (Figure b) and superior to the state-of-the-art advanced oxidation processes reported using SA as the probe (Table S4). ,− …”

Section: Resultsmentioning

confidence: 99%

Highly Efficient Hydroxyl Radicals Production Boosted by the Atomically Dispersed Fe and Co Sites for Heterogeneous Electro-Fenton Oxidation

Xin

Cao

Quan

et al. 2023

Environ. Sci. Technol.

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The heterogeneous electro-Fenton (hetero-e-Fenton)-coupled electrocatalytic oxygen reduction reaction (ORR) is regarded as a promising strategy for • OH production by simultaneously driving two-electron ORR toward H 2 O 2 and stepped activating the as-generated H 2 O 2 to • OH. However, the high-efficiency electrogeneration of • OH remains challengeable, as it is difficult to synchronously obtain efficient catalysis of both reaction steps above on one catalytic site. In this work, we propose a dual-atomic-site catalyst (CoFe DAC) to cooperatively catalyze • OH electrogeneration, where the atomically dispersed Co sites are assigned to enhance O 2 reduction to H 2 O 2 intermediates and Fe sites are responsible for activation of the as-generated H 2 O 2 to • OH. The CoFe DAC delivers a higher • OH production rate of 2.4 mmol L −1 min −1 g cat −1 than the single-site catalyst Co-NC (0.8 mmol L −1 min −1 g cat −1) and Fe-NC (1.0 mmol L −1 min −1 g cat −1). Significantly, the CoFe DAC hetero-e-Fenton process is demonstrated to be more energy-efficient for actual coking wastewater treatment with an energy consumption of 19.0 kWh kg −1 COD −1 than other electrochemical technologies that reported values of 29.7∼68.0 kW h kg −1 COD −1 . This study shows the attractive advantages of efficiency and sustainability for • OH electrogeneration, which should have fresh inspiration for the development of new-generation wastewater treatment technology.

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“…Nearly 100% recovery suggests that the fluorine-containing degradation products obtained from PFOA were mainly short-chain PFCAs and F – . According to past studies, − the degradation of PFOA in a saline solution begins with the direct electron transfer (DET) of hydrolyzed PFOA (C 7 F 15 COO – ) on the anode surface, where PFOA is attacked by SO 4 •– (produced by the anode), , causing the compound to become C 7 F 15 COO·; next the Kolbe reaction decarboxylates C 7 F 15 COO· to form C 7 F 15 ·, and then, the C 7 F 15 · reacts with ·OH, O 2 , or SO 4 •– to generate C 7 F 15 OH. The C 7 F 15 OH is thermodynamically unstable and undergoes molecular rearrangement to form C 6 F 13 COF; then, C 6 F 13 COF becomes hydrolyzed to unzip one CF 2 and release F – .…”

Section: Resultsmentioning

confidence: 99%

Electric Field-Assisted Nanofiltration for PFOA Removal with Exceptional Flux, Selectivity, and Destruction

Choi

Fang

et al. 2023

Environ. Sci. Technol.

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Per- and polyfluoroalkyl substances (PFAS) pose significant environmental and human health risks and thus require solutions for their removal and destruction. However, PFAS cannot be destroyed by widely used removal processes like nanofiltration (NF). A few scarcely implemented advanced oxidation processes can degrade PFAS. In this study, we apply an electric field to a membrane system by placing a nanofiltration membrane between reactive electrodes in a crossflow configuration. The performance of perfluorooctanoic acid (PFOA) rejection, water flux, and energy consumption were evaluated. The reactive and robust SnO2–Sb porous anode was created via a sintering and sol–gel process. The characterization and analysis techniques included field emission scanning electron microscopy (FE-SEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), ion chromatography, mass spectroscopy, porosimeter, and pH meter. The PFOA rejection increased from 45% (0 V) to 97% (30 V) when the electric field and filtration were in the same direction, while rejection capabilities worsened in opposite directions. With saline solutions (1 mM Na2SO4) present, the induced electro-oxidation process could effectively mineralize PFOA, although this led to unstable removal and water fluxes. The design achieved an exceptional performance in the nonsaline feed of 97% PFOA rejection and water flux of 68.4 L/m2 hr while requiring only 7.31 × 10–5 kWh/m3/order of electrical energy. The approach’s success is attributed to the proximity of the electrodes and membrane, which causes a stronger electric field, weakened concentration polarization, and reduced mass transfer distances of PFOA near the membrane. The proposed electric field-assisted nanofiltration design provides a practical membrane separation method for PFAS removal from water.

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Enhanced perfluorooctanoic acid degradation by electrochemical activation of peroxymonosulfate in aqueous solution

Cited by 73 publications

References 64 publications

Research on the mechanism and reaction conditions of electrochemical preparation of persulfate in a split-cell reactor using BDD anode

Research on the mechanism and reaction conditions of electrochemical preparation of persulfate in a split-cell reactor using BDD anode

Highly Efficient Hydroxyl Radicals Production Boosted by the Atomically Dispersed Fe and Co Sites for Heterogeneous Electro-Fenton Oxidation

Electric Field-Assisted Nanofiltration for PFOA Removal with Exceptional Flux, Selectivity, and Destruction

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