title: Effects of Cu2+, Ag+, and Pd2+ on the reductive debromination of 2,5-dibromoaniline by the ferrous hydroxy complex.
abstract: The ferrous hydroxy complex (FHC), composed of structural FeⅡ, has been shown to reduce a range of organic and inorganic contaminants. This study focused on the catalytic effects of Cu2+, Ag+, or Pd2+ on the reactivity of FHC suspensions towards 2,5-debromination (2,5-DBA). It was found that the target compound (2,5-DBA, 50 mg/L) could hardly be debrominated by FHC alone. However, Cu2+, Ag+, or Pd2+ had a significant promotion effect on the catalytic reactivity of structural FeⅡ on 2,5-DBA reduction. Pd2+ exhibited the best catalytic activity followed by Ag+ and Cu2+ in this study and the reductive debromination by Pd/FHC and Ag/FHC followed the pseudo-first-order kinetic model. Products distribution was highly dependent on the metal ions used. A reaction pathway was proposed in which the by-products were produced by hydrogenolysis and the elution order of bromines depended on the metal ions used. The enhanced reduction of 2,5-DBA by FHC suspensions modified by metal ions may prove useful in the development of improved materials for the treatment of halogenated organic compounds.
authors.affiliation: a State Key Laboratory of Pollution Control and Resources Reuse , School of Environmental Science & Engineering, Tongji University , Shanghai 200092 , People's Republic of China.
authors.forename: Deli
authors.initials: D
authors.lastname: Wu
authors.forename: Binbin
authors.initials: B
authors.lastname: Shao
authors.forename: Yong
authors.initials: Y
authors.lastname: Feng
authors.forename: Luming
authors.initials: L
authors.lastname: Ma
mesh_terms: D000814:Aniline Compounds / Q000737:chemistry*; D005296:Ferrous Compounds / Q000737:chemistry*; D007700:Kinetics; D019216:Metals, Heavy / Q000737:chemistry*; D010084:Oxidation-Reduction
chemical_list: C000601757:2,5-dibromoaniline; D000814:Aniline Compounds; D005296:Ferrous Compounds; D019216:Metals, Heavy
keywords: catalysis; ferrous hydroxy complex; halogenated organic compounds; metal ions; reductive debromination