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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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Abstract 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.
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Keywords
catalytic ozonation
reactive red X-3B
ceramic honeycomb
hydroxyl radical (OH·)
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Corresponding Author(s):
Yaobin ZHANG
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Online First Date: 23 April 2014
Issue Date: 25 June 2015
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