Photodegradation of rhodamine B dye using a microwave electrodeless UV lamp (MWUVL) |
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Authors: | Dinghong Gu Li Huang Chunlei Shao Haojie Fang Renxi Zhang Huiqi Hou |
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Institution: | (1) Institute of Environmental Science, Fudan University, Shanghai, 200433, China |
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Abstract: | The photodegradation of organic dye rhodamine B (RhB) in an aqueous solution was studied using a microwave electrodeless UV
lamp (MWUVL). The 185 nm vacuum UV (VUV) intensity of the MWUVL amounted to 12% of the total UV output, about 1.7 times as
high as that of the con ventional low-pressure mercury lamp. An acidic condition was preferred for the degradation of RhB.
Precipitate was generated during RhB degradation when the initial concentration of RhB solution was above 60 mg · L−1. For 100 mg · L−1 RhB at pH 4.0, the mass of precipitate produced was nearly half of the initial amount of RhB in the solution after irradi
ation for 75 min. The corresponding degradation ratio of RhB reached up to 99.4% and COD reduced 77.4%. The photo degradation
of RhB is mainly achieved by direct photolysis of RhB by 185 nm and OH radical oxidation.
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Translated from Journal of Fudan University (Natural Science), 2006, 45(6): 726–731 译自: 复旦学报 (自然科学版)] |
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Keywords: | microwave electrodeless UV lamp (MWUVL) photodegradation 185 nm rhodamine B (RhB) direct photolysis |
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