摘要： Mixed metal oxides (MMOs) are important semiconductor photocatalysts for water treatment, such as removal of organic dyes and metal ions. In this paper, CuAl hydrotalcite-like compounds (CuAl-HTLcs) were synthesized by the coprecipitation method using Al(NO3)3?9H2O and Cu(NO3)2?3H2O as raw materials. Cu2O/Cu2Al2O4 mixed metal oxides (MMO) were prepared by calcining CuAl-HTLcs at 900 °C. The obtained composites were characterized by various methods, including X-ray diffraction (XRD), Scanning electron microscopy (SEM), and UV-Vis diffuse reflectance spectroscopy (DRS), among others. Their photocatalytic activities towards removal of Rhodamine B (RhB) and Cr(VI) were evaluated by spectrophotometry. XRD revealed that CuAl-MMO composites were composed of high crystallinity Cu2O and Cu2Al2O4 grains. DRS showed the strong ultraviolet absorption ability of the composites. The electrochemical testing demonstrated CuAl-MMO composites with good photocatalytic activities towards the removal of Rhodamine B (RhB) and Cr(VI) under ultraviolet light, with reaction rate constants determined as 0.41 h?1 and 0.49 h?1, respectively. The relevant photocatalytic activities of CuAl-MMO composites were attributed to the synergy between the two components. Overall, these data look promising for future use of CuAl-MMO as an important photocatalyst for water remediation.