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This study reports on the preparation and characterization of porous clay heterostructure (PCH) as a high-surface area support for CuO nanoparticles (NPs)-based photocatalyst for the preferential oxidation of methylene blue under visible light in the absence of H2O2. CuO NPs were incorporated in PCH by thermal decomposition method. The new photocatalyst was characterized by DRS, XRD, FT-IR, nitrogen...