A novel Cu₂O nanoparticles decorated Bi₅O₇I hybrid composite was prepared through precipitation transformation and in-situ co-precipitation method in this study. The phase structures, morphologies and optical properties of as-synthesized samples were characterized by XRD, SEM, TEM and UV–vis diffuse reflectance spectroscopy. Cu₂O/Bi₅O₇I exhibits significantly improved photocatalytic activity in Cr(VI) reduction under visible light irradiation. When the mass percentage of Cu₂O to Bi₅O₇I is 15 %, Cu₂O/Bi₅O₇I composite has the best photocatalytic reduction for Cr(VI) with efficiency of 92.3 %, which is much higher than those of pure Bi₅O₇I and Cu₂O. The photocatalysts exhibited good photocatalytic reduction stability after five recycles. BET, photoluminescence and electrochemical impedance spectroscopy (EIS) measurements demonstrate that the enhanced photoreduction activity for Cr(VI) may be ascribed to the greater visible light absorption intensity, increased specific surface areas, higher efficient charge separation and transfer of photo-generated electron-hole pairs. In addition, a possible photoreduction mechanism of Cu₂O/Bi₅O₇I composite has been proposed according to the experimental results.

通过沉淀转化和原位共沉淀法制备了一种新型的Cu ₂ O纳米粒子修饰的Bi ₅ O ₇ I杂化复合材料。通过XRD，SEM，TEM和UV-vis漫反射光谱对合成样品的相结构，形貌和光学性质进行了表征。Cu ₂ O / Bi ₅ O ₇ I在可见光照射下的Cr（VI）还原中表现出显着改善的光催化活性。当Cu ₂ O相对于Bi ₅ O ₇ I的质量百分比为15％时，Cu ₂ O / Bi ₅ O ₇I复合材料对Cr（VI）的光催化还原效果最好，效率为92.3％，远高于纯Bi ₅ O ₇ I和Cu ₂ O的光催化性能。光催化剂经过5次循环后表现出良好的光催化还原稳定性。BET，光致发光和电化学阻抗谱（EIS）测量表明，对Cr（VI）的增强的光还原活性可能归因于更大的可见光吸收强度，更大的比表面积，更高的有效电荷分离和光生电子转移。孔对。另外，Cu ₂ O / Bi ₅ O ₇的可能的光还原机理根据实验结果提出了复合材料。