Photodegradation of methylene blue in natural seawater |
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| Authors: | Luni Sun Guipeng Yang Xiaoyan Cao Limin Zhou |
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| Institution: | Key Laboratory of Marine Chemistry Theory and Technology,Ministry of Education,Ocean University of China,Qingdao 266100,P.R.China |
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| Abstract: | This paper reports the photochemical degradation of Methylene Blue(MB)in natural seawater(NSW).The photodegradation reaction conformed to the first-order reaction kinetics with the rate constant 0.0158 min-1.MB was photochemically degradated faster under high-pressure mercury lamp(HPML)than under sunlight.When MB was in lower concentrations,salinity could inhibit the photoreaction whereas MB in higher concentration,salinity could accelerate the photoreaction.Humid acid could also inhibit the photoreactions.Toxicity tests with marine phytoplankton Skeletonema costatum(Sk)and Heterosigma akashiwo Hada (Ha)showed decreased acute toxicity after photodegradation. |
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| Keywords: | Methylene Blue photodegradation seawater toxicity |
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