Activity test of chitosan-ZnO as a photocatalyst in the photodegradation process of methylene blue has been carried out. The purpose of this study was to determine the effectiveness of chitosan-ZnO composites in the photodegradation process of methylene blue. Chitosan synthesized from shrimp shell waste obtained 52% of the weight of shrimp shell waste. Chitosan-ZnO was composited with three dif…