新型无极紫外灯的光氧化性能研究

本实验对新型无极紫外灯的发射光谱、不同波长光线在溶液中的传播、·OH和O3的生成量、活性艳红X-3B溶液的降解情况进行了测定,并与普通中压汞灯进行了比较.结果表明,无极紫外灯在紫外区光强约为相近功率的普通中压汞灯的20倍;在溶液中紫外光比可见光更易被吸收;·OH生成与溶液对短波长光子的吸收存在对应关系,本实验中无极紫外灯的最大氧化距离约为6 cm;O3的生成量随着空气曝气量或254 nm处的光强的增大呈指数增加;降解活性艳红X-3B溶液的过程符合负一级动力学关系,降解效果明显好于普通中压汞灯,并且证明了无极紫外灯与生成的臭氧在活性艳红X-3B的降解过程中存在协同作用.

Study on light oxidation of a new type of electrodeless discharge lamp

A new type of electrodeless discharge lamp(MWL),including spectrum,transmission of different wavelength rays in solution,generation of hydroxyl radical and ozone,degradation of reactive brilliant red X-3B,was investigated and compared with mercury lamp of medium pressure.The results showed that(1) intensity of rays of MWL below 400 nm is twenty times larger than mercury lamp and ultraviolet is absorbed easily in solution;(2) production of hydroxyl radical is corresponded with the absorption of photos of low wavelength in solution and the maximal oxidation distance of MWL is 6 cm in the experiment;(3) generation of ozone exponentially enhances with air volume and intensity of 254 nm increasing;(4) the degradation of reactive brilliant red X-3B follows pseudo-first order kinetics and efficiency of MWL is better than mercury lamp.Synergistic effects in degradation of reactive brilliant red X-3B exist in the processes combined MWL and ozone.