紫外-臭氧联合矿化水溶液中的活性蓝19染料

Mineralization of RB19 in aqueous solution with ozone in combination with ultraviolet irradiation

采用紫外-臭氧联合(UV/O3)技术矿化活性蓝19染料(RB19)模拟废水,考察了溶液pH值、染料初始浓度、臭氧投量以及温度对RB19溶液TOC去除率的影响.实验结果表明:当pH=4.0,初始质量浓度为100 mg/L,臭氧投量为3.9 g/(L.h),温度控制在30℃时,反应30 min后溶液TOC的去除率达90%以上,表明紫外臭氧联用技术对降解RB19模拟废水效果显著.根据不同实验时间所取样的紫外-可见吸收光谱扫描图以及离子色谱(IC)的检测结果,发现RB19的矿化过程中会产生含苯环、萘环、蒽环的中间产物以及有机酸类中间产物(甲酸,乙酸,草酸,顺丁烯二酸,SO42-,NO2-和NO3-),从而推断出UV/O3降解RB19的可能途径.

Mineralization of C.I.reactive blue 19（RB19） by ozonation combined with ultraviolet irradiation（UV/O3） was used to simulate wastewater.The effect of several operational parameters,including pH,initial dye concentration,ozone dose,and bulk temperature,on the reduction of total organic carbon（TOC） was investigated.The results indicated that the removal efficiency was optimum when the pH value was 4.0,the initial concentration was 100 mg/L,the ozone dose was 3.9 g/（L·h） and bulk temperature was 30 ℃.Under these conditions,the TOC removal was over 90%.Furthermore,UV-vis spectra of the reaction solution at various time-points during UV/O3 oxidation were measured,and quantitative determination of related carboxylic acid and inorganic anions（maleic acid,oxalic acid,acetic acid,formic acid,nitrite ion,nitrate ion and sulfate ion） were implemented by ion chromatography（IC） in the process of RB19 mineralization.From the identified reaction products,a possible degradation pathway for the UV/O3 oxidation of RB19 in aqueous media has been proposed.