title: Catalytic ozonation of p-chlorobenzoic acid by activated carbon and nickel supported activated carbon prepared from petroleum coke.
abstract: The aim of this research was to investigate catalytic activity of petroleum coke, activated carbon (AC) prepared from this material, Ni supported catalyst on activated carbon (Ni/AC) in the ozonation of aqueous phase p-chlorobenzoic acid (p-CBA). Activated carbon and Ni/AC catalyst were characterized by XRD and SEM. The presence of petroleum coke did not improve the degradation of p-CBA compared to ozonation alone, but it was advantageous for p-CBA mineralization (total organic carbon, TOC, reduction), indicating the generation of highly oxidant species (*OH) in the medium. The presence of either activated carbon or Ni/AC considerably improves TOC removal during p-CBA ozonation. Ni/AC catalyst shows the better catalytic activity and stability based on five repeated tests during p-CBA ozonation. During the ozonation (50 mg/h ozone flow rate) of a 10 mg/L p-CBA (pH 4.31), it can be more mineralized in the presence of Ni/AC catalyst (5.0 g/L), TOC removal rate is over 60% in 60 min, 43% using activated carbon as catalyst, only 30% with ozonation alone.
authors.affiliation: School of Chemistry & Environment, South China Normal University, Guangzhou 510006, China.
authors.forename: Xukai
authors.initials: X
authors.lastname: Li
authors.forename: Qiuyun
authors.initials: Q
authors.lastname: Zhang
authors.forename: Lili
authors.initials: L
authors.lastname: Tang
authors.forename: Ping
authors.initials: P
authors.lastname: Lu
authors.forename: Fengqiang
authors.initials: F
authors.lastname: Sun
authors.forename: Laisheng
authors.initials: L
authors.lastname: Li
mesh_terms: D002244:Carbon / Q000737:chemistry*; D002384:Catalysis; D002723:Chlorobenzoates / Q000737:chemistry*; D003077:Coke; D008855:Microscopy, Electron, Scanning; D009532:Nickel / Q000737:chemistry*; D010126:Ozone / Q000737:chemistry*; D010578:Petroleum; D014961:X-Ray Diffraction
chemical_list: D002723:Chlorobenzoates; D003077:Coke; D010578:Petroleum; D010126:Ozone; D002244:Carbon; D009532:Nickel; C040768:4-chlorobenzoic acid