Alcohols or solvents have attained much attraction in scientific community to regulate the shape and surface characteristics of TiO₂ for multiple applications. Herein, single-walled TiO₂ nanotubes (SWTNTs) were synthesized via the simple hydrothermal method in presence of different organic solvents, namely 1-propanol and 2-propanol under alkaline environment. The physicochemical properties of the as-developed SWTNTs were scrutinized using XRD, TEM, FESEM, BET and DRS. The growth of SWTNTs via 1-propanol resulted in a remarkable enhancement in the performance up to 94.97 % of Acid orange 7 (AO7) was degraded. The outstanding photodegradation performance observed was attributed to the better morphological structure and crystallinity, evidently from the structure and microscopic image analysis. The enhanced light absorption capacity towards the visible light region significantly improved the photodegradation performance of the as-developed SWTNTs. The photodegradation rate of AO7 on SWTNTs was well explained via the modified Langmuir-Hinshelwood kinetic model. Furthermore, adsorption kinetic and isotherm analysis revealed that as-developed SWTNTs obeyed the pseudo-first-order kinetics and Langmuir isotherms. Congruently, the values of thermodynamic parameters, and activation energy revealed that the adsorption of AO7 is endothermic, spontaneous and chemisorption in nature. The rise in temperature was found to be more feasible for increased removal of AO7. This enhanced degradation activities of solvent-controlled SWTNTs was strongly associated with the well-defined morphology, larger specific surface area as well as smallest band gap energy values. This research offered a new direction for the growth of catalysts with excellent and stable photodegradation and adsorption activities in the purification of organic wastewaters.

醇或溶剂在科学界已经吸引了许多人来调节TiO ₂的形状和表面特性以用于多种用途。在此，单壁TiO ₂在碱性环境下，通过简单的水热法在不同的有机溶剂（即1-丙醇和2-丙醇）存在下合成纳米管（SWTNT）。使用XRD，TEM，FESEM，BET和DRS仔细检查已开发SWTNT的理化性质。SWTNTs通过1-丙醇的生长导致性能显着提高，多达94.97％的酸性橙7（AO7）降解。从结构和显微图像分析可以明显看出，观察到的优异的光降解性能归因于更好的形态结构和结晶度。朝向可见光区域的增强的光吸收能力显着改善了所开发的SWTNT的光降解性能。通过改进的Langmuir-Hinshelwood动力学模型很好地解释了AO7在SWTNTs上的光降解速率。此外，吸附动力学和等温线分析表明，已开发的SWTNTs符合拟一级动力学和Langmuir等温线。一致地，热力学参数和活化能的值表明，AO7的吸附在本质上是吸热的，自发的和化学吸附的。发现温度升高对于增加AO7的去除更可行。溶剂控制的SWTNT的这种增强的降解活性与明确定义的形态，较大的比表面积以及最小的带隙能值密切相关。