Samples were not stirred or temperature controlled. For consecutive photoreforming trials, the reactor was opened immediately following gas sampling, the aqueous solution was aspirated from the bottom of the reactor using a needle (19G) and syringe, leaving behind the floating composite, then fresh substrate solution (217 mL 1 mol L -1 KOH, 25 mg mL -1 EG or PET) was added to the reactor which was subsequently sealed, purged with N2/CH4, and irradiated with solar light as described above. Each recyclability experiment consisted of 10 consecutive runs performed in triplicate.