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Frontiers of Environmental Science & Engineering

Front. Environ. Sci. Eng.    2015, Vol. 9 Issue (4) : 591-595
Catalytic ozonation of reactive red X-3B in aqueous solution under low pressure: decolorization and OH· generation
Hong SUN,Min SUN,Yaobin ZHANG(),Xie QUAN
Key Laboratory of Industrial Ecology and Environmental Engineering (Dalian University of Technology), Ministry of Education, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
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Catalytic ozonation of Reactive Red X-3B in aqueous solution had been carried out in an ozone oxidation reactor where Mn-Fe-ceramic honeycomb was used as the catalysts. The presence of Mn-Fe-ceramic honeycomb catalyst could obviously improve the decoloration efficiency of Reactive Red X-3B and the utilization efficiency of ozone compared to the results from non-catalytic ozonation. Adsorption of Reactive Red X-3B had no obviously influence on the degradation efficiency. Addition of tert-butanol significantly decreased the degradation efficiency, indicating that the degradation of Reactive Red X-3B followed the mechanism of hydroxyl radical (OH·) oxidation. The operating variables such as reaction pressure and ozone supply had a positive influence on the degradation efficiency, mainly attributing to facilitate the ozone decomposition and OH· formation.

Keywords catalytic ozonation      reactive red X-3B      ceramic honeycomb      hydroxyl radical (OH·)     
Corresponding Author(s): Yaobin ZHANG   
Online First Date: 23 April 2014    Issue Date: 25 June 2015
 Cite this article:   
Xie QUAN,Yaobin ZHANG,Hong SUN, et al. Catalytic ozonation of reactive red X-3B in aqueous solution under low pressure: decolorization and OH· generation[J]. Front. Environ. Sci. Eng., 2015, 9(4): 591-595.
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Yaobin ZHANG
Hong SUN
Fig.1  Schematic diagram of catalytic ozonation reaction setup

1. Oxygen, 2. Dryer, 3. Ozone generator, 4. Gas flowmeter, 5.Import valve, 6.Sampling position, 7. Heater, 8. Temperature control system, 9. Catalysts, 10.Pump, 11. Manometer, 12. Outlet pressure valve, 13. Safety valve, 14. KI solution

Fig.2  Comparison of the decolorization efficiency of X-3B with and without catalysts. (supply of ozone: 1.0 g·h-1; imposed pressure: 0.02 MPa)
Fig.3  Influence of tert-butanol on the ozonation with and without the catalysts (supply of ozone: 1.0 g·h-1; imposed pressure: 0.02 MPa)
Fig.4  Comparison of the decolorization under the different pressure (in the presence of the catalysts)
Pressure/Mpa 0 0.01 0.02 0.03 0.04
flow rate/(g·h-1) 1 0.94 0.87 0.78 0.68
Tab.1  Influence of pressure on flow rate of ozone
Fig.5  Influence of tert-butanol on the ozonation under the different pressure (in the presence of the catalysts)
P /MP K R2
0 -0.04314 0.99065
0.01 -0.07589 0.99713
0.02 -0.08006 0.99145
0.03 -0.0468 0.96539
0.04 -0.04281 0.97363
Tab.2  Peseudo-first order and R2 under different pressures
Fig.6  Comparison of the degradation efficiency of X-3B in the different ozone generation rates (pressure: 0.02 Mpa, in the presence of catalysts)
Fig.7  Influence of tert-butanol on the ozonation in the different ozone generation rates (pressure 0.02 MPa, in the presence of catalysts)
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