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The nano-photocatalyst of Cu-Al-Layered Double Hydroxide@Graphitic Carbon Nitride (LDH@CN NPC) was synthesized via a fast and cheap method, characterized, and applied for photocatalytic degradation of tetracycline (TC) antibiotic, as a model of main concern contaminant degradation under visible ray illumination and different conditions of initial TC concentration, irradiation time, photocatalyst dose and pH. The experimentally obtained results were modelled using the approaches of central composite design (CCD) and artificial neural network (ANN) to achieve a more accurate description of the process behaviour. Free radical trapping experiments verify that the holes and superoxide anion radicals were the main active species. Therefore, the high decomposition efficiency (96 %) where the parameters were 30 mgL⁻¹, 7.18, 90 min, and 0.018 g of the mentioned variables, respectively, is attributed to the …