摘要
This paper reports the photochemical degradation of Methylene Blue(MB)in natural seawater(NSW).The photode-gradation reaction conformed to the first-order reaction kinetics with the rate constant 0.0158 min-1.MB was photochemically de-gradated faster under high-pressure mercury lamp(HPML)than under sunlight.When MB was in lower concentrations,salinitycould inhibit the photoreaction whereas MB in higher concentration,salinity could accelerate the photoreaction.Humid acid couldalso inhibit the photoreactions.Toxicity tests with marine phytoplankton Skeletonema costatum(Sk)and Heterosigma akashiwo Hada(Ha)showed decreased acute toxicity after photodegradation.
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.
基金
supported by the Key Project of the Ministry of Education,China(Grant No.105105)
the Program for New Century Excellent Talents in Universities,the Ministry of Education,China(Grant No.NCET-04-0643)
the National Natural Science Foundation of China(Grant No.40525017)
the Key Project of Science and Technology of Shandong Province(Grant No.2006GG2205024)
