Titanium dioxide is a widely used material as a photocatalyst. However, the wide bandgap and limitation of use at high concentrations of pollutants have impeded its widespread use. In this study, a novel aerogel of carbon–titanium dioxide hybrid strengthened by multi-walled carbon nanotubes was synthesized for photocatalytic degradation of organic pollutants from aqueous solutions under sunlight. TiO₂ nanocrystals (about 9 nm in size) were synthesized by sol–gel method using TiCl₄ as the precursor in sulfuric acid solution and the formed anatase phase was identified by XRD analysis. For characterization of the TiO₂-CNT-C hybrid aerogels, various techniques like FESEM, EDS, XRD, BJH, BET, DRS and FTIR were utilized. The specific surface areas of the samples were between 410 and 480 m² g⁻¹. The DRS results showed a decrease in the band gap of the TiO₂ hybrid aerogel (1.9 eV) relative to that of pure TiO₂ (3.1 eV). To investigate the photocatalytic removal efficiency, methylene blue was used as a contaminant model. Photocatalytic experiments under Xenon lamp were performed with 20 mg photocatalyst in 100 ml of 50 ppm methylene blue solution. 6 samples (CAT-1, CAT-2, CXT, CA, TiO₂, P25) were used to investigate the photocatalytic degradation activity. The highest removal efficiency was 95.50% and the kinetic studies revealed that the photocatalysts containing carbon aerogels followed the second-order kinetic model and the other samples followed the first-order kinetic model. The highest adsorption capacity was 238.756 mg g⁻¹ and the lowest was 133.754 mg g⁻¹. Adsorption–degradation mechanism was also speculated.

二氧化钛是一种广泛使用的光催化剂材料。然而，宽带隙和在高浓度污染物下使用的限制阻碍了其广泛使用。在这项研究中，合成了一种由多壁碳纳米管增强的新型碳-二氧化钛杂化气凝胶，用于在阳光下光催化降解水溶液中的有机污染物。在硫酸溶液中使用 TiCl ₄作为前体，通过溶胶-凝胶法合成了TiO _{2纳米晶体（尺寸约为 9 nm），并通过 XRD 分析鉴定了形成的锐钛矿相。}用于表征 TiO ₂-CNT-C 混合气凝胶，各种技术，如 FESEM、EDS、XRD、BJH、BET、DRS 和 FTIR。样品的比表面积在410和480 m ² g ^-1之间。DRS 结果显示，相对于纯 TiO ₂ (3.1 eV) ，TiO ₂混合气凝胶的带隙 (1.9 eV) 减小。为了研究光催化去除效率，使用亚甲基蓝作为污染物模型。氙灯下的光催化实验是用 20 mg 光催化剂在 100 ml 的 50 ppm 亚甲蓝溶液中进行的。6 个样品（CAT-1、CAT-2、CXT、CA、TiO ₂, P25) 用于研究光催化降解活性。最高去除效率为95.50%，动力学研究表明，含碳气凝胶的光催化剂遵循二级动力学模型，其他样品遵循一级动力学模型。最高吸附容量为238.756 mg g ^-1，最低吸附容量为133.754 mg g ^-1。还推测了吸附 - 降解机制。