First, we built a suitable photoreactor that would allow us to carry out sorption measurements while irradiating the sample (Figure ). For this, we designed a reactor that could accommodate a gas sorption tube and light source, with a stirrer plate positioned underneath the porous liquid sample during the gas sorption experiment (Figure ). This design was subsequently 3D printed using a resin printer. The first prototypes used an LED light source that did not produce enough power output and that also caused an increase in the internal temperature in the reactor. This was mitigated by using an external light source in tandem with fans mounted to either side of the reactor, with small passages to create a push-pull airflow through the reactor. The temperature was monitored over the course of several experiments, and it remained in the range 28.5±0.5 °C, regardless of whether the light source (365 nm) was switched on (Figure ). The CAD design and 3D print files are available at github.com/GreenawayLab/Sorption-Photoreactor.