The photoreforming was next performed in a sealed, custom-made photocatalytic reactor (Figure ; Figure ) to directly couple the enzymatic pre-treatment of plastic with the photocatalytic H2 generation in an integrated process that facilitates catalyst recovery and continuous processing. For this purpose, the buffer solution consisting of the enzyme and the plastic film is kept between a photocatalyst panel (prepared by drop-casting a photocatalyst solution on frosted glass; see Experimental Section for details) and a quartz window, through which the system is illuminated (Figure ). Photocatalyst panels are ideally suited as they can be easily mounted, retrieved and scaled. Moreover, the use of a panel ensures a clean medium (and not slurries common in heterogenous photocatalysis) for the enzyme to attack the plastics, which is not possible in case of photocatalyst slurries.