In this study, TiO₂ powders were produced via sol–gel route at 500 °C for 2 h with distinct heating rates. TGA-DTA, XRD, SEM, Raman spectroscopy, XPS, UV–vis spectroscopy and photoluminescence characterization techniques were carried out for TiO₂ powders. Photocatalytic efficiency of TiO₂ powders on degradation of methylene blue (MB) solution was examined in terms of different heating rates. Thermodynamic and non-isothermal kinetic study of TiO₂ powders were estimated. TiO₂ powders showed anatase phase based on XRD results. Surface morphology of TiO₂ powders did not change with different heating rates. It can be concluded that heating rate played important role on band gap and photocatalytic activity. The band gap of the TiO₂ particles decreased from 3.25 to 2.95 with increasing heating rate. The photocatalytic activity results exhibit that T1 powders have the highest photocatalytic performances. The kinetic constant and photocatalytic degradation rate were 0.00678 min⁻¹ and 83.48%, respectively. This could be attributed to high crystalline structure and low bulk vacancies or defects. Furthermore, TiO₂ powders showed good stability. This study exhibited a new way to enhance the photocatalytic performances of pure TiO₂ powders.

在这项研究中，TiO ₂粉末是通过溶胶-凝胶法在500°C下持续2 h以不同的加热速率生产的。对TiO ₂粉末进行了TGA-DTA，XRD，SEM，拉曼光谱，XPS，UV-vis光谱和光致发光表征技术。根据不同的加热速率，研究了TiO ₂粉末对亚甲基蓝（MB）溶液降解的光催化效率。估算了TiO ₂粉末的热力学和非等温动力学研究。基于XRD结果，TiO ₂粉末显示锐钛矿相。TiO _2的表面形态加热速率不同，粉末没有变化。可以得出结论，升温速率对带隙和光催化活性起着重要作用。TiO ₂颗粒的带隙随着加热速率的增加从3.25降低到2.95。光催化活性结果表明，T1粉末具有最高的光催化性能。动力学常数和光催化降解速率分别为0.00678min ^-1和83.48％。这可能归因于高晶体结构和低空位或缺陷。此外，TiO ₂粉末显示出良好的稳定性。这项研究展示了一种提高纯TiO ₂粉末光催化性能的新方法。