基于光纤SPR光谱分析的污水降解过程监测研究

讨论了光纤表面等离子体波传感器的工作原理，并对将其用于监测以甲基橙为代表的环境污水降解过程的可行性进行了探讨。用光纤SPR传感器监测了50 mL初始浓度为30 mg·L-1的甲基橙原溶液在降解过程浓度的变化，对降解过程中光纤SPR传感器的光谱进行了详细的分析;同时采用紫外-分光光度计对降解过程中溶液浓度的变化进行了监测，并对2种方法所测的数据进行了分析对比。结果表明，光纤SPR同常规方法的测量结果一致，随着降解时间的增加，甲基橙溶液的吸光度和浓度逐渐减小，光纤SPR传感器的共振波长逐渐发生蓝移，同初始标定的甲基橙原溶液共振光谱比较，说明甲基橙逐渐被降解，且在2 h内降解率达到73%，说明用光纤SPR传感器监测污水降解过程是完全可行的。研究结果不仅为环境污水降解过程提供了一种新的监测方法，同时促进了我国SPR传感技术与环保监测研究结合，为光纤SPR技术走向实用，并最终实现产业化积累了经验。

Monitoring the Sewage Degradation by Analyzing Optic Fiber SPR Spectrum Character

The working principle of the optic fiber SPR sensor was discussed in the present paper at first.The feasibility of using it to monitor the degradation process of the environmental sewage represented by the methyl orange was studied Finally,the optic fiber SPR sensor was adopted to monitor the change in degradation concentration represented by the original methyl orange solution on the base of 50 mL initial concentration 30 mg·L~(-1),and the optic fiber SPR spectrum character of degradation process was analyzed in detail Meanwhile the UV speetrophotometer was used to measure the change in concentration in the course of the degradation.The measurement data were analyzed and compared at large.The research work indicates that both the methods have consistent results,as the degradation time increases,the absorbanee and concentration of the environmental sewage represented by the methyl orange solution decrease by and by,and the resonant wavelength of the optic fiber SPR sensorblue shifts step by step,as compared to the original standardization methyl orange solution resonant spectrum.It was shown that the methyl orange solution was degraded,and the rate of degradation was up to about 73 percent within two hours.The comparative results illustrate that it is feasible to use the optic fiber SPR sensor to monitor the environmental sewage degradation.The research result not only provides a new monitoring method for the degradation process of the environmental sewage,but also promotes the technique of the SPR sensor combined to the environment monitor by a long way.