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CdS/TiO₂ composites were successfully prepared by hydrothermal treatment at a considerably low temperature (180°C). The effects of four different synthetic procedures on the microstructures of CdS/TiO₂ composites, such as morphology, crystal structure, porous property and optical response, were investigated in detail. It was found that CdS/TiO₂ composites consisted of anatase TiO₂ and cubic phase CdS. The hydrothermal treatment of mixed reactant-containing solution improved the crystallinity of both CdS and TiO₂. The abundant pores in catalyst particles formed by CO₂ gas bubbles due to hydrothermal decomposition of the urea molecules increased the specific surface area and pore volume of the catalysts. Meanwhile, the absorption edges of CdS/TiO₂ samples were drastically extended to around 550nm. The photocatalytic activities of these prepared samples were evaluated by the photocatalytic …