【摘要】 自制微波无极紫外灯(MWUVL)发出的185 nm UV占总辐射量的12%,是普通低压汞灯的1.7倍左右.利用自制MWUVL研究了罗丹明B(RhB)水溶液的光降解.研究表明,酸性条件有利于RhB的光降解;ρ初始≥60mg.L-1的RhB溶液在光降解过程中有沉淀析出;pH=4.0的100 mg.L-1RhB溶液光照75 m in后,析出的沉淀质量接近初始RhB质量的一半,脱色率达99.4%,CODC r下降77.4%;RhB的降解主要是185 nm直接光解和OH自由基氧化的共同作用的结果.更多还原

【Abstract】 The photo-degradation of organic dye Rhodamine B（RhB） solution was studied using a novel microwave electrodeless UV lamp（MWUVL）.The 185 nm intensity of the MWUVL amounts to 12% of the total UV irradiation,（1.7） times as high as that of the conventional low-pressure mercury lamp.Acidic condition was preferred for the degradation of RhB.Precipitate was found to be generated during RhB degradation when the initial concentration of RhB solution was higher than 60 mg·L^-1.For 100 mg·L^-1 RhB at pH 4.0,the mass of precipitate generated was nearly half of the initial amount of RhB in the solution,after irradiation for 75 min.The corresponding decolourisation rate of RhB reached up to 99.4% and COD_Cr reduced 77.4%.The degradation of RhB was mainly a collective act of direct photolysis of 185 nm and OH radical oxidation.更多还原