title: Catalytic wet oxidation of o-chlorophenol at mild temperatures under alkaline conditions.
abstract: Wet oxidation of a 100 ppm aqueous solution of o-chlorophenol (o-CP) was performed in a lab-scale batch reactor using 3% Ru/TiO(2) catalyst at 373 and 413 K, and a partial oxygen pressure of 0.1 MPa. The experiments were conducted by varying the initial pH values of o-CP solution from pH 6.3 to 9.8 and 11.8. From the results, it was revealed that the catalytic decomposition of o-CP occurred most effectively at 413 K and at the initial pH of 9.8. Complete decomposition and dechlorination of o-CP were almost achieved within 1h, and about 85% of TOC was removed in 3.0 h. On the other hand, the catalytic wet oxidation of o-CP at a higher pH value of 11.8 was not effective in the removal of TOC. The incomplete removal of TOC at the initial pH of 11.8 is likely attributed to a low pK(a) of carboxylic acids formed during the wet oxidation of o-CP.
authors.affiliation: Research Center for Advanced Waste and Emission Management, Department of Energy Engineering and Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan.
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Kojima
authors.forename: Tadashi
authors.initials: T
authors.lastname: Fukuta
authors.forename: Takehisa
authors.initials: T
authors.lastname: Yamada
authors.forename: Maurice S
authors.initials: MS
authors.lastname: Onyango
authors.forename: Eileen C
authors.initials: EC
authors.lastname: Bernardo
authors.forename: Hitoki
authors.initials: H
authors.lastname: Matsuda
authors.forename: Kohichi
authors.initials: K
authors.lastname: Yagishita
mesh_terms: D002244:Carbon / Q000737:chemistry; D002384:Catalysis; D002733:Chlorophenols / Q000032:analysis / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste; D010084:Oxidation-Reduction; D013696:Temperature; D014867:Water; D014874:Water Pollutants, Chemical / Q000032:analysis; D018508:Water Purification / Q000379:methods*
chemical_list: D002733:Chlorophenols; D007220:Industrial Waste; D014874:Water Pollutants, Chemical; D014867:Water; D002244:Carbon; C030683:2-chlorophenol