In the last step, the reduction of nitrobenzene was successfully carried out in a long-term fed-batch experiment in order to demonstrate the positive effect of the coating of the photocatalyst on the WLEs. With continuous addition of nitrobenzene, the product concentration formation increased steadily which led to increased optical density of the reaction medium. In the case of free photocatalyst particles, this significantly reduced the reaction rate. The coated WLE, however, did not have this limitation and exhibited a steady product formation rate.