Synthesis of Bentonite-Polydopamine Composite with CuO Semiconductor as Catalytic Photodegradation of Methylene Blue Dye has been conducted. The resulting bentonite-polydopamine CuO composite, was characterized using XRD, SEM-EDX, and UV-Vis DRS. The methylene blue photodegradation was carried out at several variabels, including the initial of concentration, contact time, and photocatalyst weig…