title: Bio-electro-Fenton system for enhanced estrogens degradation.
abstract: The feasibility of removing estrogens including 17β-estradiol (E2) and 17α-ethynyl-estradiol (EE2) was studied in a bio-electro-Fenton (BEF) system equipped with a Fe@Fe2O3/non-catalyzed carbon felt (NCF) composite cathode. E2 and EE2 were removed by reactive oxidants, produced by bio-electro-Fenton system and zero-valent iron/O2 system, as well as adsorption. Under closed-circuit condition, 81% of E2 and 56% of EE2 were removed within 10h in the system, in which the highest concentration of total iron ions and H2O2 reached 81 and 1.2mg/L, respectively. The maximum power density of BEF system equipped with Fe@Fe2O3/NCF electrode was 4.35 W/m(3). Two intermediates of E1 and 6-OH-E2 were identified during Fenton oxidation of E2. This study demonstrates the degradation fate of E2 and EE2 in a BEF system equipped with Fe@Fe2O3/NCF electrodes, which provides a promising and cost-effective solution for the removal of recalcitrant contaminants with simultaneous power generation.
authors.affiliation: Key Laboratory for Urban Habitat Environmental Science and Technology, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, China.
authors.forename: Nan
authors.initials: N
authors.lastname: Xu
authors.forename: Yingyuan
authors.initials: Y
authors.lastname: Zhang
authors.forename: Huchun
authors.initials: H
authors.lastname: Tao
authors.forename: Shungui
authors.initials: S
authors.lastname: Zhou
authors.forename: Yaqiong
authors.initials: Y
authors.lastname: Zeng
mesh_terms: D001673:Biodegradation, Environmental; D001674:Bioelectric Energy Sources; D019149:Bioreactors; D004560:Electricity; D004566:Electrodes; D004967:Estrogens / Q000302:isolation & purification*; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007501:Iron / Q000032:analysis / Q000737:chemistry*
chemical_list: D004967:Estrogens; C045076:Fenton's reagent; D006861:Hydrogen Peroxide; D007501:Iron