A series of highly-active catalysts were obtained from the same precursor and calcined at different temperatures to generate single-phase anatase and anatase-rutile composite powders. Performance of the catalysts was compared with the P25 reference and assessed through the measurement of the optical properties of the materials and calculation of the efficiency of the photodegradation of a multifunctional dye, acid blue 9. X-ray diffraction, porosimetry, UV–vis and photoluminescence spectroscopies were used to analyze the physico-chemical properties of the catalysts and to test their stability under reaction conditions. Through the calculation of the reaction rate and total organic carbon (TOC) observables as well as the apparent and true quantum efficiency parameters we analyzed quantitatively the performance of the materials. We observe that a high surface area anatase sample showed optimum activity and adequate selectivity towards full mineralization. The catalysts were subjected to sedimentation and recycling experiments and the catalytic performance compared on the basis of the true quantum efficiency. The use of this last parameter leads to different conclusions than those supported by an analysis based in the kinetic constant, reaction rate or apparent quantum efficiency. The high quantum efficiency and easy recovery after repeated experiments shown by the catalysts were interpreted on the basis of the characterization results.

从相同的前体中获得了一系列高活性催化剂，并在不同的温度下进行了煅烧，以生成单相锐钛矿和锐钛矿-金红石型复合粉末。将催化剂的性能与P25参比进行了比较，并通过测量材料的光学性能和计算多功能染料酸性蓝9的光降解效率进行了评估。X射线衍射，孔隙率法，UV-vis和使用光致发光光谱法分析催化剂的物理化学性质并测试其在反应条件下的稳定性。通过计算反应速率和可观察到的总有机碳（TOC）以及表观和真实的量子效率参数，我们定量分析了材料的性能。我们观察到高表面积的锐钛矿样品显示出最佳的活性，并且对完全矿化具有足够的选择性。对该催化剂进行了沉淀和再循环实验，并根据真实的量子效率比较了其催化性能。与基于动力学常数，反应速率或表观量子效率的分析所支持的结论相比，使用最后一个参数得出的结论有所不同。根据表征结果解释了催化剂重复实验后的高量子效率和易于回收的现象。对该催化剂进行了沉淀和再循环实验，并根据真实的量子效率比较了其催化性能。与基于动力学常数，反应速率或表观量子效率的分析所支持的结论相比，使用最后一个参数得出的结论有所不同。根据表征结果解释了催化剂重复实验后的高量子效率和易于回收的现象。对该催化剂进行了沉淀和再循环实验，并根据真实的量子效率比较了其催化性能。与基于动力学常数，反应速率或表观量子效率的分析所支持的结论相比，使用最后一个参数得出的结论有所不同。根据表征结果解释了催化剂重复实验后的高量子效率和易于回收的现象。