Cu_xO (x = 1 or 2)/Carbon nanotubes (CNTs) nanocomposite was prepared through a two-step process including copper electroless deposition on CNTs followed by chemical-thermal oxidation. The effect of electroless deposition time and hence copper oxide content on the photocatalytic activity was studied, and 30 min of deposition was optimal. X-ray diffraction (XRD) and Raman results confirm the formation of both crystalline CuO and Cu₂O phases. Field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) images showed the dispersion of copper oxide nanoparticles onto the surface of CNTs. The diffuse reflectance spectroscopy (DRS) and photoluminescence (PL) results showed that decreasing the copper oxide content decreases the bandgap and the electron-hole pairs recombination rate. The photocatalytic activity was investigated for the degradation of methyl orange (MO) and methylene blue (MB) under visible light irradiation. Relatively complete methylene blue (MB) degradation was obtained after 120 min for a 2 mg/L solution, while about 70% of methyl orange (MO) was degraded. The stability of the sample was also investigated, and the sample was able to maintain its performance after three cycles.

Cu _x O（x = 1 或 2）/碳纳米管 (CNT) 纳米复合材料通过两步法制备，包括在 CNT 上无电沉积铜，然后进行化学热氧化。研究了化学沉积时间和氧化铜含量对光催化活性的影响，最佳沉积时间为 30 分钟。X 射线衍射 (XRD) 和拉曼结果证实了结晶 CuO 和 Cu ₂的形成O 相。场发射扫描电子显微镜 (FESEM) 和透射电子显微镜 (TEM) 图像显示氧化铜纳米粒子分散在碳纳米管表面。漫反射光谱 (DRS) 和光致发光 (PL) 结果表明，降低氧化铜含量会降低带隙和电子-空穴对复合率。研究了在可见光照射下降解甲基橙 (MO) 和亚甲蓝 (MB) 的光催化活性。对于 2 mg/L 的溶液，120 分钟后获得了相对完全的亚甲蓝 (MB) 降解，而大约 70% 的甲基橙 (MO) 被降解。还考察了样品的稳定性，样品在三个循环后仍能保持其性能。