A bench-scale setup was assembled to investigate CO2 capture and release in the pyranine photoacid system under 15% CO2 and blue LED light irradiation (Figure ). The setup consisted of a reaction vial containing 5 mL of the photoacid solution, with the 15% CO2 introduced into the vial at the desired flow rate using a mass-flow controller. The solution pH was monitored by a pH probe. Gas output from the reaction vial was measured using a mass-flow meter and an IR CO2 sensor. The reaction vial was enclosed within an aluminum photobox designed to reflect and confine the light emitted by a 45 W blue LED at 427 nm. During the reaction, the photobox was cooled using a cooling fan. The solution used in the experiments contained 100 mM of pyranine and 100 mM of potassium carbonate (K2CO3). Before the photoreaction, the solution was saturated with 15% CO2. Once saturation was achieved, the reaction vial was irradiated, and the gas output was recorded. Figure illustrates the observed CO2 release under the standard conditions, where a total of 0.12 mmol of CO2 was collected within 30 minutes (blue curve).