The present article reports a novel visible light-driven photocatalyst of TiO₂/Au/SWCNT nanohybrid prepared by sol-gel approach and successfully assessed for the photocatalytic degradation of the organic methylene blue. TiO₂/Au/SWCNT nanohybrid was obtained by doping titanium dioxide (TiO₂) lattice with gold (Au) and supporting with modified single-walled carbon nanotubes (SWCNTs). All the synthesized samples showed anatase-structure TiO₂ as evaluated by XRD. Morphological analysis based on FESEM, HRTEM and EDS revealed that the SWCNTs were successfully decorated with TiO₂/Au nanoparticles. UV-Vis absorption spectra exhibited increased absorption and higher photo response to the visible light range after being doped with Au and SWCNTs. Based on the results of photoluminescence (PL), the TiO₂/Au/SWCNT nanohybrid exhibited lower recombination rate in comparison to the TiO₂ and TiO₂/Au nanohybrid, thus facilitated the charge generation. The photocatalytic activity of the synthesized samples was determined by decomposing MB dye under solar-simulated light. The pristine TiO₂ and TiO₂/Au binary nanohybrid suffered from low photodegradation efficiency and severe recombination problems. By supporting the TiO₂/Au with SWCNTs scaffold, the photocatalytic efficiency of the TiO₂/Au nanohybrid can be increased significantly. The improved photocatalytic performance of TiO₂/Au/SWCNT can be associated to its high surface area, the excellent visible-light photosensitivity and the incorporation of Au and SWCNTs, which enhances the charge-carriers separation.

本文报道了一种新型的可见光驱动的TiO ₂ / Au / SWCNT纳米杂化光溶胶-凝胶法制备的光催化剂，并成功地评估了有机亚甲基蓝的光催化降解。通过用金（Au）掺杂二氧化钛（TiO ₂）晶格并用改性的单壁碳纳米管（SWCNT）负载获得TiO ₂ / Au / SWCNT纳米杂化体。通过XRD评估，所有合成样品均显示锐钛矿结构的TiO ₂。基于FESEM，HRTEM和EDS的形态分析表明，SWCNTs成功地被TiO ₂装饰/ Au纳米粒子。掺杂金和SWCNT后，UV-Vis吸收光谱显示出增加的吸收和对可见光范围的更高的光响应。基于光致发光（PL）的结果，与TiO ₂和TiO ₂ / Au纳米杂化物相比，TiO ₂ / Au / SWCNT纳米杂化物表现出较低的复合率，从而促进了电荷产生。通过在太阳模拟的光下分解MB染料来确定合成样品的光催化活性。原始的TiO ₂和TiO ₂ / Au二元纳米杂化物存在光降解效率低和严重的重组问题。通过负载TiO ₂SWCNTs支架制备/ Au可以显着提高TiO ₂ / Au纳米杂化物的光催化效率。TiO ₂ / Au / SWCNT的改进的光催化性能可以归因于其高表面积，出色的可见光光敏性以及Au和SWCNT的掺入，从而增强了电荷-载流子的分离。