title: [Development of Self-assembled Dumbbell-like Fe3O4 Micro/nanomaterial for Application in Thermocatalytic Degradation of Polybrominated Biphenyls].
abstract: Polybrominated biphenyls (PBBs) are a group of new persistent organic pollutants, which have high toxicity and long-term bioaccumulation, and cause potential risks to human beings and aquatic ecosystem. Self-assembled dumbbell-like Fe3O4 was synthesized via ethylene-glycol mediated method to degrade PBBs, using BB209 as a model compound. The results showed that the growth process of dumbbell-like Fe3O4 precursor had two stages involving a fast nucleation of amorphous primary particles followed by a slow aggregation and crystallization of primary particles. Dumbbell-like Fe3O4 showed high activity for degradation of BB209 at the reaction time of 30 min with the degradation efficiency of nearly 100% at 300 degrees C. A whole series of nonabromobiphenyl to monobromobiphenyl and biphenyls were detected as the degradation products of BB209 by dumbbell-like Fe3O4, indicating the occurrence of successive hydrodebromination reaction. Furthermore, the amounts of three NoBB isomers followed the order of BB207 > BB208 > BB206, indicating that the reactivity of C--Br of BB209 was in order of meta- > para- > ortho-positions.
authors.forename: Xin-chen
authors.initials: XC
authors.lastname: Huang
authors.forename: Gang
authors.initials: G
authors.lastname: Zong
authors.forename: Ye-xuan
authors.initials: YX
authors.lastname: Liu
authors.forename: Hui-jie
authors.initials: HJ
authors.lastname: Lu
authors.forename: Qian-qian
authors.initials: QQ
authors.lastname: Li
authors.forename: Bin-ke
authors.initials: BK
authors.lastname: Li
authors.forename: Yan-hui
authors.initials: YH
authors.lastname: Zhao
authors.forename: Gui-jin
authors.initials: GJ
authors.lastname: Su
mesh_terms: D001713:Biphenyl Compounds / Q000737:chemistry; D003460:Crystallization; D052203:Ferrosoferric Oxide / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry*; D011075:Polybrominated Biphenyls / Q000737:chemistry*
chemical_list: D001713:Biphenyl Compounds; D052203:Ferrosoferric Oxide; D011075:Polybrominated Biphenyls; C010574:biphenyl