Application Of Flow Reactor In Lead Ion Detection And Photochemical Coupling Reaction

The flow reactor uses channels or pipes to achieve a continuous flow.It provides more controlled reaction parameters than batch reactors and,in some cases,allows for reactions that are difficult to perform in conventional reactors.It is widely used in the fields of multiphase reaction,stirring reaction,temperature-controlled reaction,and photochemical/electrochemical reaction.This paper mainly studies the application of flow reactors in electrochemical detection and photochemical synthesis.（1）Nowadays,heavy metal pollution has attracted wide attention.Many electrochemical methods have been developed to detect heavy metal ions.The electrode surface usually needs to be modified,and the process is complicated.Herein,electrodes were fabricated by direct laser sintering on commercial polymer films.The prepared porous carbon electrodes can be used directly without any modification.The higher the graphitization degree of porous carbon electrode,the higher its sensitivity to lead ion detection.The electrodes were fixed in a 3D-printed flow reactor to form an electrochemical flow detection device.The effects of stirred reactor and flow reactor on the sensitivity of electrode detection were compared by numerical simulation and experiment.The results show that the flow condition is more favorable to improve the sensitivity of the electrode to detect lead ions.The limit of detection is about 0.0330mg/L for Pb²⁺.Moreover,the flow detection device has been proved to have good repeatability and stability.（2）At present,the use of photocatalyst has promoted the development of photochemistry.Effective irradiation is essential for photochemical reactions.When photochemical reactions are carried out in batch reactors,part of the solution in the reactor may not be irradiated by light source,which may cause side reactions.Therefore,high surface area/volume ratio reactors are usually required.Flow reactors are widely used in photochemical reactions due to their high surface area to volume ratio.In this paper,a flow reaction device was designed and built,and it was applied to double catalytic C-N cross-coupling reaction.The result shows that the conversion rate of this reaction can reach more than 95%in the flow reactor.Therefore,the reactor is expected to be used in more chemical reactions.