Study on the treatment of 2-sec-butyl-4,6-dinitrophenol (DNBP) wastewater by ClO2 in the presence of aluminum oxide as catalyst.
The chlorine dioxide (ClO(2)) oxidative degradation of 2-sec-butyl-4,6-dinitrophenol (DNBP) in aqueous solution was studied in detail using Al(2)O(3) as a heterogeneous catalyst. The operating parameters such as the ClO(2) concentration, catalyst dosage, initial DNBP concentration, reaction time and pH were evaluated. Compared with the conventional ClO(2) oxidation process without the catalyst, the ClO(2) catalytic oxidation system could significantly enhance the degradation efficiency. Under the optimal condition (DNBP concentration 39 mg L(-1), ClO(2) concentration 0.355 g L(-1), reaction time 60 min, catalyst dosage 10.7 g L(-1) and pH 4.66), degradation efficiency approached 99.1%. The catalyst was used at least 8 cycles without any appreciable loss of activity. The kinetic studies revealed that the ClO(2) catalytic oxidation degradation of DNBP followed pseudo-first-order kinetics with respect to DNBP concentration. The ClO(2) catalytic oxidation process was found to be very effective in the decolorization and COD(Cr) reduction of real wastewater from DNBP manufacturing. Thus, this study showed potential application of ClO(2) catalytic oxidation process in degradation of organic contaminants and industrial effluents.
Wang
Hui-Long
HL
Department of Chemistry, Dalian University of Technology, Dalian 116023, China.
Dong
Jing
J
Jiang
Wen-Feng
WF
D000537:Aluminum Oxide / Q000737:chemistry*; D002384:Catalysis; D017606:Chlorine Compounds / Q000737:chemistry*; D007220:Industrial Waste / Q000517:prevention & control*; D010087:Oxides / Q000737:chemistry*; D010575:Pesticides; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
D017606:Chlorine Compounds; D007220:Industrial Waste; D010087:Oxides; D010575:Pesticides; D014874:Water Pollutants, Chemical; C025109:chlorine dioxide; D000537:Aluminum Oxide