title: Oxidative degradation of bisphenol A and 17α-ethinyl estradiol by Fenton-like activity of silver nanoparticles in aqueous solution.
abstract: Silver nanoparticles (AgNPs) have been reported to have antibacterial activities and cytotoxicity, resulting from the dissolved silver cation (Ag+) and its soluble complexes. However, to our knowledge, little has been reported about their potential use in degrading organic contaminants such as endocrine-disrupting compounds in aqueous solution. In this first report on the subject, we examined the effectiveness of the oxidative degradation of bisphenol A (BPA) and 17α-ethinyl estradiol (EE2) in water by reactive oxygen species formed during the decomposition of H2O2, assisted by polyvinylpyrrolidone (PVP)-stabilized AgNPs. The dissolution of AgNPs accompanied generation of OH at low pH. The fully dispersed PVP-AgNPs in the presence of H2O2exhibited fast degradation kinetics for EE2 at a typical aquatic condition of pH (6-7). The oxidation kinetics of BPA and EE2 by PVP-AgNPs can be interpreted using three different modeling approaches: an initial pseudo-first-order, a retarded first-order rate, and Behnajady-Modirshahla-Ghanbery kinetic equation. The findings showed that AgNPs may have potential to facilitate the in situ oxidation for emerging contaminants in the aqueous environment.
authors.affiliation: Department of Civil and Environmental Engineering, University of South Carolina, 300 Main Street, Columbia, SC 29208, USA.
authors.forename: Chang Min
authors.initials: CM
authors.lastname: Park
authors.affiliation: Department of Civil and Environmental Engineering, Korea Army Academy at Young-Cheon, 495 Hogook-ro, Kokyungmeon, Young-Cheon, Gyeongbuk 38900, South Korea.
authors.forename: Jiyong
authors.initials: J
authors.lastname: Heo
authors.affiliation: Department of Civil and Environmental Engineering, University of South Carolina, 300 Main Street, Columbia, SC 29208, USA. Electronic address: yoony@cec.sc.edu.
authors.forename: Yeomin
authors.initials: Y
authors.lastname: Yoon
mesh_terms: D001559:Benzhydryl Compounds / Q000032:analysis*; D002384:Catalysis; D052244:Endocrine Disruptors / Q000032:analysis*; D004997:Ethinyl Estradiol / Q000032:analysis*; D006861:Hydrogen Peroxide / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry*; D010084:Oxidation-Reduction; D010636:Phenols / Q000032:analysis*; D011205:Povidone / Q000737:chemistry; D012834:Silver / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis*; D000098826:Bisphenol A Compounds
chemical_list: D001559:Benzhydryl Compounds; D052244:Endocrine Disruptors; D004997:Ethinyl Estradiol; D006861:Hydrogen Peroxide; D010636:Phenols; D011205:Povidone; D012834:Silver; D014874:Water Pollutants, Chemical; C006780:bisphenol A; D000098826:Bisphenol A Compounds
keywords: 17α-ethinyl estradiol; Bisphenol A; Degradation; Hydroxyl radicals; Silver nanoparticle