title: Photochemical defluorination of aqueous perfluorooctanoic acid (PFOA) by Fe(0)/GAC micro-electrolysis and VUV-Fenton photolysis.
abstract: Perfluorooctanoic acid (PFOA) is extremely persistent and bioaccumulative in the environment; thus, it is very urgent to investigate an effective and moderate technology to treat the pollution of PFOA. In this study, a process combined iron and granular activated carbon (Fe(0)/GAC) micro-electrolysis with VUV-Fenton system is employed for the remediation of PFOA. Approximately 50 % PFOA (10 mg L(-1)) could be efficiently defluorinated under the following conditions: pH 3.0, dosage of Fe 7.5 g L(-1), dosage of GAC 12.5 g L(-1), and concentration of H2O2 22.8 mmol L(-1). Meanwhile, during the process, evident defluorination was observed and the concentration of fluoride ion was eventually 3.23 mg L(-1). The intermediates including five shorter-chain perfluorinated carboxylic acids (PFCAs), i.e., C7, C6, C5, C4, and C3, were also analyzed by high-performance liquid chromatography tandem mass spectrometry (HPLC/MS/MS) and defluorination mechanisms of PFOA was proposed, which involved photochemical of OH·, direct photolysis (185-nm VUV), and photocatalytic degradation of PFOA in the presence of Fe(3+) (254-nm UV).
authors.affiliation: Ministry of Education Key Laboratory of Pollution Control and Ecological Remediation for Industrial Agglomeration Area, College of Environment and Energy, South China University of Technology, Guangzhou, 510006, China.
authors.forename: Li-Hong
authors.initials: LH
authors.lastname: Zhang
authors.affiliation: Ministry of Education Key Laboratory of Pollution Control and Ecological Remediation for Industrial Agglomeration Area, College of Environment and Energy, South China University of Technology, Guangzhou, 510006, China. jhcheng@scut.edu.cn.|Hunan Key Laboratory of Applied Environmental Photocatalysis, Changsha University, Changsha, 410022, People's Republic of China. jhcheng@scut.edu.cn.
authors.forename: Jian-Hua
authors.initials: JH
authors.lastname: Cheng
authors.affiliation: Ministry of Education Key Laboratory of Pollution Control and Ecological Remediation for Industrial Agglomeration Area, College of Environment and Energy, South China University of Technology, Guangzhou, 510006, China.
authors.forename: Xia
authors.initials: X
authors.lastname: You
authors.affiliation: Ministry of Education Key Laboratory of Pollution Control and Ecological Remediation for Industrial Agglomeration Area, College of Environment and Energy, South China University of Technology, Guangzhou, 510006, China.
authors.forename: Xiao-Yan
authors.initials: XY
authors.lastname: Liang
authors.affiliation: Ministry of Education Key Laboratory of Pollution Control and Ecological Remediation for Industrial Agglomeration Area, College of Environment and Energy, South China University of Technology, Guangzhou, 510006, China.|Hunan Key Laboratory of Applied Environmental Photocatalysis, Changsha University, Changsha, 410022, People's Republic of China.
authors.forename: Yong-You
authors.initials: YY
authors.lastname: Hu
mesh_terms: D002210:Caprylates / Q000737:chemistry* / Q000528:radiation effects*; D002244:Carbon / Q000032:analysis / Q000378:metabolism; D004572:Electrolysis / Q000379:methods*; D005466:Fluorocarbons / Q000737:chemistry* / Q000528:radiation effects*; D006861:Hydrogen Peroxide / Q000737:chemistry*; D010782:Photolysis
chemical_list: D002210:Caprylates; D005466:Fluorocarbons; D002244:Carbon; C023036:perfluorooctanoic acid; D006861:Hydrogen Peroxide
keywords: Defluorinaiton; Fe0/GAC micro-electrolysis; Intermediates; Mechanisms; PFOA; VUV-Fenton