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Mn3O4- and CuO-modified zinc sulfide (ZnS) photocatalysts were successfully prepared and characterized by X-ray diffraction, field-emission scanning electron microscopy, high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, surface area analysis, and diffuse-reflectance spectroscopy methods. The weight percentages of manganese (Mn) or copper (Cu) in the composite catalysts were maintained between 0.5% and 5%. Optical characterizations of the synthesized catalysts showed the shifted photoabsorption properties from the ultraviolet region to visible light. The band gaps of ZnS loaded with 0.5–5% Mn and Cu were calculated from the absorption edge positions and were in the ranges of 2.61–2.81 and 2.81–2.92 eV, respectively. The photocatalytic performances of the ZnS composites were evaluated for the visible-light-assisted photocatalytic decomposition of Orange II dye. ZnS loaded with 1.5 wt % Mn and 1 wt % Cu at a dosage of 0.5 g/L shows the highest photocatalytic activity, which represents 32.1% and 61.1% degradation of Orange II dye, respectively.

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