title: Boiling significantly promotes photodegradation of perfluorooctane sulfonate.
abstract: The application of photochemical processes for perfluorooctane sulfonate (PFOS) degradation has been limited by a low treatment efficiency. This study reports a significant acceleration of PFOS photodegradation under boiling condition compared with the non-boiling control. The PFOS decomposition rate increased with the increasing boiling intensity, but declined at a higher hydronium level or under oxygenation. These results suggest that the boiling state of solution resulted in higher effective concentrations of reactants at the gas-liquid interface and enhanced the interfacial mass transfer, thereby accelerating the PFOS decomposition. This study broadens our knowledge of PFOS photodegradation process and may have implications for development of efficient photodegradation technologies.
authors.affiliation: CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science and Technology of China, Hefei, China; USTC-CityU joint Advanced Research Center, Suzhou, China; State Key Laboratory in Marine Pollution, Department of Biology and Chemistry, City University of Hong Kong, Hong Kong Special Administrative Region.
authors.forename: Xian-Jin
authors.initials: XJ
authors.lastname: Lyu
authors.affiliation: CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science and Technology of China, Hefei, China; USTC-CityU joint Advanced Research Center, Suzhou, China. Electronic address: wwli@ustc.edu.cn.
authors.forename: Wen-Wei
authors.initials: WW
authors.lastname: Li
authors.affiliation: USTC-CityU joint Advanced Research Center, Suzhou, China; State Key Laboratory in Marine Pollution, Department of Biology and Chemistry, City University of Hong Kong, Hong Kong Special Administrative Region.
authors.forename: Paul K S
authors.initials: PK
authors.lastname: Lam
authors.affiliation: CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science and Technology of China, Hefei, China; USTC-CityU joint Advanced Research Center, Suzhou, China. Electronic address: hqyu@ustc.edu.cn.
authors.forename: Han-Qing
authors.initials: HQ
authors.lastname: Yu
mesh_terms: D017738:Alkanesulfonic Acids / Q000032:analysis* / Q000528:radiation effects; D005466:Fluorocarbons / Q000032:analysis* / Q000528:radiation effects; D006358:Hot Temperature; D008962:Models, Theoretical; D010782:Photolysis; D044366:Transition Temperature
chemical_list: D017738:Alkanesulfonic Acids; D005466:Fluorocarbons; C076994:perfluorooctane sulfonic acid
keywords: Boiling; Mass transfer; Perfluorooctane sulfonate (PFOS); Photodegradation; Vapor bubbles