Breakdown of PFOA in a hydrodynamic cavitation-activated persulfate system: Comparative roles of sulfate and hydroxyl radicals in degradation process and mechanistic insights

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60460709%3A41330%2F24%3A98228" target="_blank" >RIV/60460709:41330/24:98228 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1016/j.jece.2024.113376" target="_blank" >https://doi.org/10.1016/j.jece.2024.113376</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jece.2024.113376" target="_blank" >10.1016/j.jece.2024.113376</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Breakdown of PFOA in a hydrodynamic cavitation-activated persulfate system: Comparative roles of sulfate and hydroxyl radicals in degradation process and mechanistic insights

Popis výsledku v původním jazyce

Perfluorooctanoic acid (PFOA) remains a persistent organic pollutant within aquatic ecosystems. Activated persulfate (PS) technology has been widely used because it can effectively destroy the stable structure of PFOA. However, this technology still has some restrictive problems, such as the large amount of PS required for the reaction and the high SO42- concentration in the wastewater after the reaction. In this study, we used the advantages of hydrodynamic cavitation to activate PS, such as promoting mass transfer and oxidant utilization. After 3 hours of treatment, the HC/PS system showed outstanding performance in that 93.6% of PFOA was degraded, and 31.09% of PFOA was defluorinated under optimal conditions with smaller PS dosage and lesser SO42- generation. The different inhibitory effects of coexisting substances (Cl-, CO32-, F-, NO3-, SO42-, HA) on the system were emphasized. The contribution rates of sulfate radicals (SO4•-, 84.4%) and hydroxyl radicals (·OH, 10.9%), which are the main active substances in the HC/PS system, were calculated during the degradation of PFOA. The potential degradation pathways of PFOA were proposed based on the intermediates identified through LC-MS/MS. PFOA gradually lost CF2 units, forming shorter-chain intermediates (PFHpA, PFHxA, PFPeA, PFBA) and F-, ultimately converting to H2O and CO2. Above all, this study provides valuable insights into the future wastewater treatment process for PFOA pollution and has important guiding significance for practical engineering applications.

Název v anglickém jazyce

Breakdown of PFOA in a hydrodynamic cavitation-activated persulfate system: Comparative roles of sulfate and hydroxyl radicals in degradation process and mechanistic insights

Popis výsledku anglicky

Perfluorooctanoic acid (PFOA) remains a persistent organic pollutant within aquatic ecosystems. Activated persulfate (PS) technology has been widely used because it can effectively destroy the stable structure of PFOA. However, this technology still has some restrictive problems, such as the large amount of PS required for the reaction and the high SO42- concentration in the wastewater after the reaction. In this study, we used the advantages of hydrodynamic cavitation to activate PS, such as promoting mass transfer and oxidant utilization. After 3 hours of treatment, the HC/PS system showed outstanding performance in that 93.6% of PFOA was degraded, and 31.09% of PFOA was defluorinated under optimal conditions with smaller PS dosage and lesser SO42- generation. The different inhibitory effects of coexisting substances (Cl-, CO32-, F-, NO3-, SO42-, HA) on the system were emphasized. The contribution rates of sulfate radicals (SO4•-, 84.4%) and hydroxyl radicals (·OH, 10.9%), which are the main active substances in the HC/PS system, were calculated during the degradation of PFOA. The potential degradation pathways of PFOA were proposed based on the intermediates identified through LC-MS/MS. PFOA gradually lost CF2 units, forming shorter-chain intermediates (PFHpA, PFHxA, PFPeA, PFBA) and F-, ultimately converting to H2O and CO2. Above all, this study provides valuable insights into the future wastewater treatment process for PFOA pollution and has important guiding significance for practical engineering applications.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10511 - Environmental sciences (social aspects to be 5.7)

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING

ISSN

2213-3437

e-ISSN

2213-3437

Svazek periodika

12

Číslo periodika v rámci svazku

5

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

13

Strana od-do

1-13

Kód UT WoS článku

001263103500001

EID výsledku v databázi Scopus

2-s2.0-85196804677