title: Biological catalyzed denitrification by a functional electropolymerization biocarrier modified by redox mediator.
abstract: Electropolymerization biocarriers were prepared by the electropolymerization of polypyrrole (PPy) on an active carbon felt (ACF) electrode using doping anions anthraquinone-2-sulfonate (AQS) or Na(2)SO(4). The functional electropolymerization biocarrier (ACF/PPy/AQS) with AQS was used as an immobilized redox mediator for the denitrification process. The characteristics of the electropolymerization biocarriers were analyzed by scanning electron microscope, elemental analyses, Fourier transform infrared (FTIR) spectroscopy and Raman spectroscopy. The results suggested that the denitrification efficiency increased nearly 1.5-fold with ACF/PPy/AQS (0.04 mmol L(-1) AQS) compared to the control. A linear correlation was found for the k value and the AQS concentration (C(AQS)), which was k=624.71C(AQS)+83.87 (R(2)=0.9893). The ORP value stabilized around -200 mV for the denitrification process with ACF/PPy/AQS, which was -25 mV lower than that with ACF/PPy/Na(2)SO(4). Repeated-batch operations indicated that the denitrification efficiency with ACF/PPy/AQS maintained over 90% of the original value and exhibited better catalytic activity and durability.
authors.affiliation: State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, PR China.
authors.forename: Huijuan
authors.initials: H
authors.lastname: Liu
authors.forename: Jianbo
authors.initials: J
authors.lastname: Guo
authors.forename: Jiuhui
authors.initials: J
authors.lastname: Qu
authors.forename: Jing
authors.initials: J
authors.lastname: Lian
authors.forename: Yankai
authors.initials: Y
authors.lastname: Guo
authors.forename: William
authors.initials: W
authors.lastname: Jefferson
authors.forename: Jingliang
authors.initials: J
authors.lastname: Yang
mesh_terms: D055162:Biocatalysis; D004563:Electrochemistry; D009573:Nitrites / Q000737:chemistry*; D010084:Oxidation-Reduction; D011108:Polymers / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013059:Spectrum Analysis, Raman
chemical_list: D009573:Nitrites; D011108:Polymers