Previous works with titanium dioxide based photocatalysts synthesized with supercritical fluids led to improved catalyst properties in comparison to those prepared by traditional methods, but still insufficient CO₂ reduction rates. In this work, in order to upgrade this type of catalysts, two supercritical methods have been used to prepare CNT/TiO₂ and CNT/TiO₂/Cu nanocomposites. The effect on photocatalytic performance of CNT/TiO₂ ratio and Cu load has been investigated. Decreasing photocatalytic activities were observed when the CNT/TiO₂ relationship separated from unit. Regarding the effect of copper doping, it was overshadowed by the effect of CNT support. Finally, because of the excellent properties of CNTs, synthesized composites showed greater catalytic activities than bare TiO₂. Specifically, the catalyst with largest activity led to CO and CH₄ production rates of 8.1 and 1.1 μmol g⁻¹ h⁻¹, which were much higher than those on P25 (4 times for CO and 15 times for CH₄).

与通过传统方法制备的那些相比，先前与由超临界流体合成的基于二氧化钛的光催化剂的工作导致了改进的催化剂性能，但是仍然不足以还原CO ₂。在这项工作中，为了升级这种类型的催化剂，已经使用了两种超临界方法来制备CNT / TiO ₂和CNT / TiO ₂ / Cu纳米复合材料。研究了CNT / TiO ₂比和Cu负载量对光催化性能的影响。CNT / TiO ₂时光催化活性下降关系与单位分离。关于铜掺杂的影响，它被碳纳米管载体的影响所掩盖。最后，由于碳纳米管的优异性能，合成的复合材料比裸露的TiO ₂表现出更大的催化活性。具体而言，具有最大活性的催化剂导致CO和CH _4的产生速率分别为8.1和1.1μmolg ^-1  h ^-1，远高于P25（CO的₄倍，CH _4的15倍）。