title: Catalytic wet air oxidation of 2-chlorophenol over sewage sludge-derived carbon-based catalysts.
abstract: A sewage sludge derived carbon-supported iron oxide catalyst (FeSC) was prepared and used in the Catalytic Wet Air Oxidation (CWAO) of 2-chlorophenol (2-CP). The catalysts were characterized in terms of elemental composition, surface area, pHPZC, XRD and SEM. The performances of the FeSC catalyst in the CWAO of 2-CP was assessed in a batch reactor operated at 120°C under 0.9MPa oxygen partial pressure. Complete decomposition of 2-CP was achieved within 5h and 90% Total Organic Carbon (TOC) was removed after 24h of reaction. Quite a straight correlation was observed between the 2-CP conversion, the amount of iron leached in solution and the pH of the reaction mixture at a given reaction time, indicating a strong predominance of the homogeneous catalysis contribution. The iron leaching could be efficiently prevented when the pH of the solution was maintained at values higher than 4.5, while the catalytic activity was only slightly reduced. Upon four successive batch CWAO experiments, using the same FeSC catalyst recovered by filtration after pH adjustment, only a very minor catalyst deactivation was observed. Finally, based on all the identified intermediates, a simplified reaction pathway was proposed for the CWAO of 2-CP over the FeSC catalyst.
authors.affiliation: Institut de recherches sur la catalyse et l'environnement de Lyon (IRCELYON), CNRS - Université Claude Bernard Lyon 1, 2 Avenue Albert Einstein, 69626 Villeurbanne Cedex, France; School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, PR China.
authors.forename: Yuting
authors.initials: Y
authors.lastname: Tu
authors.affiliation: School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, PR China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou 510275, PR China.
authors.forename: Ya
authors.initials: Y
authors.lastname: Xiong
authors.affiliation: School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, PR China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou 510275, PR China.
authors.forename: Shuanghong
authors.initials: S
authors.lastname: Tian
authors.affiliation: School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, PR China.
authors.forename: Lingjun
authors.initials: L
authors.lastname: Kong
authors.affiliation: Institut de recherches sur la catalyse et l'environnement de Lyon (IRCELYON), CNRS - Université Claude Bernard Lyon 1, 2 Avenue Albert Einstein, 69626 Villeurbanne Cedex, France. Electronic address: claude.descorme@ircelyon.univ-lyon1.fr.
authors.forename: Claude
authors.initials: C
authors.lastname: Descorme
mesh_terms: D002244:Carbon / Q000737:chemistry*; D002384:Catalysis; D002733:Chlorophenols / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008855:Microscopy, Electron, Scanning; D010084:Oxidation-Reduction; D012722:Sewage; D014961:X-Ray Diffraction
chemical_list: D002733:Chlorophenols; D012722:Sewage; D002244:Carbon; C030683:2-chlorophenol
keywords: 2-Chlorophenol; Catalytic wet air oxidation (CWAO); Iron oxide; Sewage sludge based catalyst; Stability