System and method for simultaneously detecting multiple free radicals in photocatalysis process on line

Abstract

The invention discloses a system and a method for simultaneously detecting multiple free radicals in a photocatalysis process on line. A micro-fluidic chip in the system is provided with a sample injection pool, a sample waste liquid pool, a first buffer liquid storage pool, a second buffer liquid storage pool, a first buffer waste liquid pool and a second buffer waste liquid pool. The sample injection pool is connected with a pump outlet and is communicated with the sample waste liquid pool through a first channel. The first buffer liquid storage tank is communicated with the first buffer waste liquid tank through a second channel. The second buffer liquid storage tank is communicated with the second buffer waste liquid tank through a third channel. The first channel intersects with the second channel, the second channel intersects with the third channel, the first channel does not intersect with the third channel, the first channel is provided with a photocatalytic reaction area anda mixing channel, the photocatalytic reaction area is provided with a photocatalyst layer, the photocatalytic reaction area is connected with the mixing channel, and the mixing channel is located on the upstream of the intersection of the first channel and the second channel. According to the invention, various free radicals can be detected on line at the same time.

Description

technical field [0001] The invention belongs to the technical field of chemical analysis and detection, and relates to a system and method for simultaneously on-line detection of multiple free radicals in a photocatalytic process. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Photocatalytic reactions can use solar energy to realize photocatalytic organic synthesis, water decomposition and environmental purification, photoelectric conversion, etc. The photogenerated charge transfer process at the semiconductor / water interface is accompanied by reactive oxygen species (ROS), such as OH, O 2 · - 、H 2 o 2 , 1 o 2 The selectivity and kinetic process of reactive oxygen ...

AI Technical Summary

Problems solved by technology

These intermittent operation methods need to capture by adding selective probes, and then sample, separate, and measure at a certain time point, which cannot be measured online, which greatly limits the study of its generation kinetics

After research by the inventors, the existing method can detect TiO at the single-molecule level by using highly sensitive fluorescent probes. 2 In the photocatalytic process, single free radicals in air and water such as 1 o 2 , OH and O 2 · - However, the inventors of the present invention have found through research that this method cannot solve the problem of photobleaching caused by long-term irradiation of fluorescent probes. In addition, this method does not realize the quantitative determination of these reactive oxygen species

At the same time, the inventors of the present invention have also learned that the continuous flow chemiluminescence can be used to measure TiO 2 Three kinds of ROS produced in the photocatalytic reaction, this method combines quasi-real-time and online linearity of continuous flow technology and high sensitivity and transient response of chemiluminescence, however, the inventors of the present invention found that this method can only be used in a single measure a free radical

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