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To plan great photocatalytic performance, fast photo-generated charge recombination in nanocatalysts should be repressed. Thus, copper sulphide-Zirconium dioxide (CuS-ZrO 2 ) nanocomposites were synthesised via a facile chemical method. The field-emission scanning electron microscopy (FESEM) results indicated that a heterojunctions interface among CuS and ZrO 2 . XRD analysis showed optimum CuS-ZrO 2  photocatalyst with an average diameter of 42.58 nm were found. The UV–vis diffuse reflection spectroscopy (DRS) illustrated that the synthesised CuS-ZrO 2  nanocomposites owned the highest absorption intensity in the UV-light range compared with pure ZrO 2  nanoparticles. The bandgap (E g ) values of ZrO 2  nanoparticles and CuS-ZrO 2  nanocomposites were found 3.55 eV, and 2.65 eV, respectively. These characteristic structural and optical property consequence showed that the CuS-ZrO 2  nanocomposites with great photocatalysis progress for degradation of tetracycline. Among the different ratio nanocomposites, CuS-ZrO 2 -2 indicates the highest photocatalytic efficiency (97.15%) in acidic pH and 60 min. Photocatalytic was optimised by response surface methodology with the Box-Behnken model. The study provides a promising photocatalyst to be used for organic pollutant removal in a large scale.

Copper sulphide-Zirconium dioxide nanocomposites photocatalyst with enhanced UV-light photocatalysis efficiency: structural and methodology