P-chlorophenol wastewater treatment by microwave-enhanced catalytic wet peroxide oxidation.
A microwave-enhanced catalytic wet peroxide oxidation (MW-CWPO) technology was investigated to treat a high concentration of p-chlorophenol wastewater under a mild condition. The MW-CWPO experiments were carried out in a microwave autoclave using copper(II) oxide (CuO)-loaded active carbon as a catalyst. The p-chlorophenol was directly ring-opened within 5 minutes at 343 K and 0.3 MPa and then mineralized to carbon dioxide and water. More than 90% of the total organic carbon was removed within 15 minutes. The reaction activation energy (Ea) of hydrogen peroxide (H2O2) decomposition was decreased from 47.7 to 43.1 kJ/mol under microwave irradiation. The H2O2 catalytic decomposition was fitted to a second-order reaction under microwave irradiation, while it followed a first-order reaction without microwave irradiation. The experimental results indicate that the MW-CWPO method has significant potential applications for a high concentration of p-chlorophenol wastewater.
Zhao
Guohua
G
Department of Chemistry, Tongji University, Shanghai, P. R. China. g.zhao@mail.tongji.edu.cn
Lv
Baoying
B
Jin
Yan
Y
Li
Dongming
D
D002244:Carbon / Q000737:chemistry*; D002384:Catalysis; D002733:Chlorophenols / Q000737:chemistry*; D003300:Copper / Q000737:chemistry; D006861:Hydrogen Peroxide / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008872:Microwaves; D010084:Oxidation-Reduction; D013499:Surface Properties; D013696:Temperature; D014873:Water Pollutants / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
D002733:Chlorophenols; D014873:Water Pollutants; C029107:4-chlorophenol; D002244:Carbon; D003300:Copper; D006861:Hydrogen Peroxide; C030973:cupric oxide