Details

Autor(en) / Beteiligte

• Hao, Feifei
• Guo, Weilin
• Wang, Anqi
• Leng, Yanqiu
• Li, Helian

Titel

Intensification of sonochemical degradation of ammonium perfluorooctanoate by persulfate oxidant

Ist Teil von

• Ultrasonics sonochemistry, 2014-03, Vol.21 (2), p.554-558

Ort / Verlag

Kidlington: Elsevier B.V

Erscheinungsjahr

2014

Link zum Volltext

Quelle

MEDLINE

Beschreibungen/Notizen

• •APFO was effectively decomposed in persulfate/ultrasound system.•APFO decomposition under different conditions was studied.•The SO4−•/APFO reactions primarily occur at the bubble–water interface. Ammonium perfluorooctanoate (APFO) is an emerging environmental pollutant attracting significant attention due to its global distribution, high persistence, and bioaccumulation properties. The decomposition of APFO in aqueous solution with a combination of persulfate oxidant and ultrasonic irradiation was investigated. The effects of operating parameters, such as ultrasonic power, persulfate concentration, APFO concentration, and initial media pH on APFO degradation were discussed. In the absence of persulfate, 35.5% of initial APFO in 46.4μmol/L solution under ultrasound irradiation, was decomposed rapidly after 120min with the defluorination ratio reaching 6.73%. In contrast, when 10mmol/L persulfate was used, 51.2% of initial APFO (46.4μmol/L) was decomposed and the defluorination ratio reached 11.15% within 120min reaction time. Enhancement of the decomposition of APFO can be explained by acceleration of substrate decarboxylation, induced by sulfate radical anions formed from the persulfate during ultrasonic irradiation. The SO4−•/APFO reactions at the bubble-water interface appear to be the primary pathway for the sonochemical degradation of the perfluorinated surfactants.