采用低温水热合成法制备纳米Cu FeO_2(nano-Cu FeO_2),并通过X射线衍射仪、扫描电子显微镜、X射线能谱仪、紫外-可见漫反射光谱仪和光化学反应器对其物理化学性能及光催化性能进行了分析。结果表明,采用该方法合成的nano-Cu FeO_2以斜方六面体(3R)为主,并含有少量的六边形(2H)晶型,禁带宽度为1.15 e V。将其应用于可见光催化还原Cr(Ⅵ)废水,还原效率优于微米级的Cu FeO_2(micron-Cu FeO_2),且可连续重复利用5次而保持还原效率在90%以上。 Nanocrystalline CuFeO_2 (nano-CuFeO_2) was prepared by hydrothermal synthesis at low temperature and characterized by X-ray diffraction, scanning electron microscopy, X-ray energy dispersive spectroscopy, UV-visible diffuse reflectance spectroscopy and photochemical reactor The photocatalytic performance was analyzed. The results show that the nano-Cu FeO 2 synthesized by this method is predominantly rhombohedral (3R) and contains a small amount of hexagonal (2H) crystal with a forbidden band width of 1.15 eV. The photocatalytic reduction of Cr (Ⅵ) wastewater by visible light is more effective than that of micron-sized Cu-FeO_2 (micron-CuFeO_2), and can be continuously reused for 5 times to maintain the reduction efficiency above 90%.