A photocatalytic in situ monitoring system based on surface-enhanced Raman spectroscopy

Abstract

The invention discloses a photocatalytic in-situ monitoring system based on surface-enhanced Raman spectroscopy. The monitoring system includes: Raman excitation light source, laser coupling lens, narrow-band filter, total reflection mirror, dichroic mirror, focusing coupling lens, surface-enhanced Raman scattering fiber probe, liquid phase photocatalytic reactor, photocatalytic Light source, Raman collection lens and spectrometer. One end of the common detection part of the surface-enhanced Raman scattering fiber probe extends out of a first fork and a second fork, the extended end of the first fork is coupled to the focusing coupling lens, and the end of the second fork The extension end is coupled with the photocatalytic light source, and the other end of the public detection part is set in the liquid phase photocatalytic reactor. The Raman excitation light and the photocatalytic light are co-transmitted, which greatly reduces the difficulty of the experiment and can effectively avoid the The monitoring error caused by incomplete coincidence can effectively improve the accuracy of Raman dynamic monitoring. The monitoring system has a compact structure and good portability.

Description

technical field [0001] The invention relates to the field of photocatalytic in-situ monitoring, in particular to a photocatalytic in-situ monitoring system based on surface-enhanced Raman spectroscopy. Background technique [0002] Photocatalytic chemical reaction refers to a type of chemical reaction carried out by photocatalytic materials (such as TiO2) under ultraviolet or visible light irradiation, such as photocatalytic hydrolysis for hydrogen production, photocatalytic degradation of organic matter, etc., and has important applications in energy, environment and other fields. The photocatalytic reaction mechanism and photocatalyst selection have an important impact on the chemical reaction speed and efficiency. The dynamic monitoring of the photocatalytic chemical reaction process is the premise of understanding the photocatalytic reaction mechanism and designing high-efficiency photocatalysts, which has become a current research hotspot. [0003] Photocatalytic chemi...

AI Technical Summary

Problems solved by technology

In this Raman in-situ monitoring method, the thin layer of reaction solution on the surface of the solid SERS substrate is volatile under the irradiation of Raman excitation light, which causes the concentration of the reaction solution to change, thus affecting the accuracy of the monitoring process.

[0006] Since the incident light path of the photocatalytic light source and the Raman excitation light path of the above two methods are not in the same path, in order to realize the monitoring of the photocatalytic process, it is necessary to adjust the focal point coincidence of the two paths of light, which not only greatly increases the difficulty of the experiment, but also has the Monitoring errors caused by incomplete coincidence of focus points

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