Catalytic wet oxidation of o-chlorophenol at mild temperatures under alkaline conditions.
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.
Kojima
Yoshihiro
Y
Research Center for Advanced Waste and Emission Management, Department of Energy Engineering and Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan.
Fukuta
Tadashi
T
Yamada
Takehisa
T
Onyango
Maurice S
MS
Bernardo
Eileen C
EC
Matsuda
Hitoki
H
Yagishita
Kohichi
K
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*
D002733:Chlorophenols; D007220:Industrial Waste; D014874:Water Pollutants, Chemical; D014867:Water; D002244:Carbon; C030683:2-chlorophenol