Prior to the photocatalysis experiments, in order to remove TPA from the LCC pretreated PET solution, the solution was acidified with 1 M HCl to a pH of 3 which led to the precipitation of TPA as a white precipitate (Figure ). The suspension was subsequently filtered using a syringe filter (0.2 mm) to obtain a clear solution. The clear solution was then subsequently neutralized with 1 M NaOH to the original pH of 6.5. Tests were also conducted directly with the enzyme pre-treated solution without TPA removal.