title: Radical induced degradation of acetaminophen with Fe3O4 magnetic nanoparticles as heterogeneous activator of peroxymonosulfate.
abstract: Magnetic nano-scaled particles Fe3O4 were studied for the activation of peroxymonosulfate (PMS) to generate active radicals for degradation of acetaminophen (APAP) in water. The Fe3O4 MNPs were found to effectively catalyze PMS for removal of APAP, and the reactions well followed a pseudo-first-order kinetics pattern (R(2)>0.95). Within 120min, approximately 75% of 10ppm APAP was accomplished by 0.2mM PMS in the presence of 0.8g/L Fe3O4 MNPs with little Fe(3+) leaching (<4μg/L). Higher Fe3O4 MNP dose, lower initial APAP concentration, neutral pH, and higher reaction temperature favored the APAP degradation. The production of sulfate radicals and hydroxyl radicals was validated through two ways: (1) indirectly from the scavenging tests with scavenging agents, tert-butyl alcohol (TBA) and ethanol (EtOH); (2) directly from the electron paramagnetic resonance (ESR) tests with 0.1M 5,5-dimethyl-1-pyrrolidine N-oxide (DMPO). Plausible mechanisms on the radical generation from Fe3O4 MNP activation of PMS are proposed based on the results of radical identification tests and XPS analysis. It appeared that Fe(2+)Fe(3+) on the catalyst surface was responsible for the radical generation. The results demonstrated that Fe3O4 MNPs activated PMS is a promising technology for water pollution caused by contaminants such as pharmaceuticals.
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai City 200092, China.
authors.forename: Chaoqun
authors.initials: C
authors.lastname: Tan
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai City 200092, China. Electronic address: gaonaiyun@126.com.
authors.forename: Naiyun
authors.initials: N
authors.lastname: Gao
authors.affiliation: Department of Earth and Environmental Studies, Montclair State University, Montclair, NJ 07043, USA.
authors.forename: Yang
authors.initials: Y
authors.lastname: Deng
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai City 200092, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Deng
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai City 200092, China.
authors.forename: Shiqing
authors.initials: S
authors.lastname: Zhou
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai City 200092, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Li
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai City 200092, China.
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Xin
mesh_terms: D000082:Acetaminophen / Q000737:chemistry*; D005290:Ferric Compounds / Q000737:chemistry*; D008280:Magnetics; D053768:Metal Nanoparticles; D010545:Peroxides / Q000737:chemistry*
chemical_list: D005290:Ferric Compounds; D010545:Peroxides; C000499:ferric oxide; C038288:peroxymonosulfate; D000082:Acetaminophen
keywords: Acetaminophen; Fe(3)O(4); Heterogeneous catalyst; Peroxymonosulfate; Radicals