For the batch studies, 2 mg of the photocatalyst powder (TiO2|Pt or CNx|Ni2P) was added to 1 mL of the enzyme pre-treated plastic solution (pH ~6-8) in Pyrex glass photoreactor vials (internal volume: 7.91 mL) and sealed with a rubber septa. The photocatalyst was dispersed via bath sonication for 25 min. Thereafter, the samples were purged with N2 (with 2% CH4 as an internal standard and leakage control during gas analysis) for another 25 min. The samples were then irradiated using a solar light simulator (Newport Oriel) calibrated to 100 mW cm -2 (1 Sun) and equipped with an air mass 1.5 global (AM 1.5 G) filter and a water filter to remove infrared radiation. The temperature was maintained at 25 ºC and the samples were stirred at 600 rpm during irradiation. For control experiments involving visible light, a λ>410 nm cut-off filter was used. The H2 generation was monitored by analyzing the reactor headspace gas (50 µL) using gas-chromatography (GC) after 24 (discussed below).