高铁酸钾降解苯并芘的荧光光谱研究

摘要

The degradation of Benzo(a)pyrene (BaP) by potassium ferrate was researched by means of multiple fluorescence spectroscopic methods such as synchronous, time-scan, excitation emission matrix (EEM) and photometry, under the optimal condition. Within the degradation process, the characteristics of the BaP's concentration at different time-intervals, and the kinetics of the degradation of BaP by potassium ferrate were discussed. From the experimental data, both synchronous and EEM spectra's results showed that the concentration of BaP was reduced 90% by potassium ferrate within 20 s after degradation, and the reaction process was very slow after 60 s. The degradation kinetic equation, In(F0/Ft) = 0.563 2t + 0. 171 2, (R2 = 0. 994 2), was obtained through a convenient and fast way combining the time-scan fluorescence data and photometry data, and the photometry included the synchronous photometry and emission photometry. According to the kinetic equation, the degradation of BaP by potassium ferrate was in accord with the order of the first order reaction. So this article could provide a very useful conference for the research on the pollutant degradation by potassium ferrate, especially for the degradation process and the degradation mechanisms.%在优化的反应条件下,研究了高铁酸钾与苯并芘(BaP)的降解反应过程,通过联合应用同步,三维(EEM),时间扫描及荧光光度定量等多种荧光光谱分析方法所提供的多角度的荧光光谱信息,揭示了BaP分子在降解过程中浓度随时间变化规律,尤其高铁酸钾与BaP作用过程的动力学特征.同步荧光和三维荧光光谱共同揭示出,高铁酸钾在20 s内能降解91％的BaP,60 s以后反应趋于缓慢的变化规律；由时间扫描荧光光谱结合发射和同步两种荧光光度定量方法,便捷地获得了高铁酸钾与BaP的反应过程中的动力学方程:ln(F0/F1)=0.5632t+0.1712,(R2=0.9942),由此推测高铁酸钾与BaP的反应过程符合一级反应动力学规律.为研究高铁酸钾降解其他污染物反应过程的机理提供了十分有益的参考.