title: Highly efficient and stable Zr-doped nanocrystalline PbO2electrode for mineralization of perfluorooctanoic acid in a sequential treatment system.
abstract: Zr-doped nanocrystalline PbO2(Zr-PbO2) film electrodes were prepared at different bath temperatures. The Zr-PbO2electrode doped at 75°C (75-Zr-PbO2) featured high oxygen evolution overpotential, large effective area and good electrocatalytic performance. The oxygen evolution potential and the effective area of 75-Zr-PbO2achieved 1.91V (vs. SCE) and 9.1cm2, respectively. The removal efficiency and the defluorination ratio of PFOA reached 97.0% and 88.1% after 90min electrolysis. The primary mineralization products (i.e., F-and intermediates) and their change trends were determined. The 75-Zr-PbO2electrode was introduced to sequentially treat the PFOA wastewater. In an 116h of 75-Zr-PbO2electrocatalysis sequential process, the PFOA, PFHpA, PFHxA, PFPeA, PFBA, PFPrA, TFA, and TOC concentrations were reduced to below 30, 2.5, 1.3, 1.0, 0.5, 0.2, 0.1, and 9mgL-1, respectively, demonstrating the promising application of the sequential treatment system for the treatment of PFOA wastewater.
authors.affiliation: State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, PR China.
authors.forename: Zesheng
authors.initials: Z
authors.lastname: Xu
authors.affiliation: State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, PR China.
authors.forename: Yanxin
authors.initials: Y
authors.lastname: Yu
authors.affiliation: State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, PR China.
authors.forename: Han
authors.initials: H
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, PR China; School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan 523808, PR China. Electronic address: junfengn@bnu.edu.cn.
authors.forename: Junfeng
authors.initials: J
authors.lastname: Niu
keywords: Continuous-flow reactor; Defluorination; Electrochemical degradation; Mechanisms; Perfluorooctanoic acid