Low-cost test rig for characterization of photocatalytic two dimensional materials using photonically sized UV-A LED light sources

In the presented studies, a system for the characterization of two-dimensional photocatalysts was developed and tested. In the system, reference substances can be studied online with regard to their degradability and adsorption on photocatalytic materials. In order to perform accurate calculations of the quantum and photon efficiency of the catalysts, the LED arrays used were adjusted in their spacing by simulations so that a homogeneous light field is imaged on the catalysts. The system was tested with respect to measurement accuracy and reproducibility and the photocatalytic degradation of methylene blue, methyl orange and rhodamine B was investigated. Exemplarily, the reaction kinetics, photolysis and adsorption on the tested photocatalysts were determined for these compounds and the calculation was presented in detail. The exact construction plans and circuits as well as the sensors and their programming are presented in detail and should encourage other scientists to replicate the experimental setup, since especially in the field of photocatalysis research, often the results of publications cannot be compared with each other.本研究开发并测试了一套用于二维光催化剂（two-dimensional photocatalysts）表征的实验系统。该系统可在线研究参比物质在光催化材料上的降解性能与吸附行为。为精准计算催化剂的量子效率与光子效率，本研究通过仿真调整所用LED阵列的间距，使催化剂表面可形成均匀光照场。本研究针对测量精度与可重复性对该系统进行了验证，并探究了亚甲基蓝、甲基橙及罗丹明B的光催化降解过程。以这三种化合物为例，本研究测定了其在受试光催化剂上的反应动力学、光解行为与吸附特性，并详细展示了相关计算过程。本研究还详细给出了该系统的精确搭建图纸、电路设计、传感器及其编程代码，以期为其他科研人员重复该实验装置提供参考——由于光催化研究领域中，不同已发表成果的结果往往难以相互比对，该工作的复用性具有重要意义。