氧气的紫外光谱检测方法及其紫外光催化转化过程研究

发布时间：2018-04-04 22:42

本文选题：氧气　切入点：臭氧　出处：《哈尔滨工业大学》2017年硕士论文

【摘要】：氧气和臭氧均是大气中常见气体。氧气是非极性分子,吸收特性较差,很难对其浓度进行精确测量,因此发展简单精确的氧气检测技术是十分必要的。氧气在紫外光照射下会产生臭氧,然而目前缺乏对氧气紫外光催化转化产生臭氧这一过程的定量描述。紫外吸收光谱检测技术以其非接触测量、高分辨率、高灵敏度、可实时在线监测等特点被广泛应用于气体测量。本文基于Beer-Lambert定律,分别开展了对氧气、臭氧紫外吸收光谱检测技术的探究。开展氧气浓度检测的紫外吸收光谱检测技术的研究。利用氧气在186~196nm真空紫外吸收波段,基于积分光谱法构建了氧气紫外吸收光谱检测理论,并建立了实验系统;确定了氧气的光学参量,测量了氧气光学参量的定标曲线,并测得氧气紫外吸收光谱检测技术的探测限为0.3%,测量不确定度为±0.2%。开展氧气浓度检测的紫外二级吸收光谱检测技术的研究。构建了氧气紫外二级吸收光谱检测理论,设计实验成功将二级光谱从总透射光谱中提取出来;确定了氧气的光学参量,测量了氧气光学参量的定标曲线,并测得氧气紫外二级吸收光谱检测技术的探测限为0.3%,测量不确定度为±0.3%。开展氧气紫外光催化转化过程及臭氧紫外吸收光谱检测技术的探究。实验中确定了臭氧的光学参量,得出氧气紫外光催化转化过程中臭氧的产生速率与初始氧气浓度成正比;测得紫外光照下氧气光学参量变化量与臭氧光学参量变化量之间呈线性关系,并根据氧气的光学参量定标曲线,得出了臭氧光学参量的定标曲线。
[Abstract]:Oxygen and ozone are common gases in the atmosphere.Oxygen is a nonpolar molecule with poor absorption characteristics, so it is difficult to measure its concentration accurately. Therefore, it is necessary to develop a simple and accurate oxygen detection technique.Oxygen can produce ozone under ultraviolet light, however, there is a lack of quantitative description of the process of ozone generation by ultraviolet photocatalytic conversion of oxygen.UV absorption spectrum detection technology is widely used in gas measurement due to its non-contact measurement, high resolution, high sensitivity, real-time on-line monitoring and so on.Based on Beer-Lambert 's law, the detection techniques of oxygen and ozone ultraviolet absorption spectra were studied.The study of ultraviolet absorption spectrometry for oxygen concentration detection was carried out.Using oxygen in the 186~196nm vacuum ultraviolet absorption band, based on the integral spectrum method, the theory of oxygen ultraviolet absorption spectrum detection is constructed, and the experimental system is established, the optical parameters of oxygen are determined, and the calibration curve of oxygen optical parameters is measured.The detection limit of oxygen ultraviolet absorption spectrometry is 0.3 and the uncertainty of measurement is 卤0.2.To study the detection technology of oxygen concentration by UV-2-level absorption spectrum.The theory of oxygen ultraviolet secondary absorption spectrum detection was constructed, and the secondary spectrum was extracted from the total transmission spectrum successfully, the optical parameters of oxygen were determined, and the calibration curves of oxygen optical parameters were measured.The detection limit of oxygen ultraviolet second order absorption spectrometry is 0.3 and the uncertainty of measurement is 卤0.3.The process of oxygen ultraviolet photocatalytic conversion and the detection technology of ozone ultraviolet absorption spectrum were studied.The optical parameters of ozone are determined in the experiment. It is concluded that the rate of ozone generation is proportional to the initial oxygen concentration in the process of photocatalytic conversion of oxygen.The linear relationship between the changes of oxygen optical parameters and ozone optical parameters under ultraviolet light was obtained. According to the calibration curves of optical parameters of oxygen, the calibration curves of ozone optical parameters were obtained.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O657.3;TQ123.2

【参考文献】