1：Experimental Design and Method Selection:

The study involved treating {001}TiO2 with different NaOH concentrations (0, 2, 5, 10, 15 M) to investigate changes in properties and photocatalytic performance. Methods included hydrothermal synthesis, characterization techniques (XRD, SEM, HRTEM, BET, FT-IR, UV-vis DRS, PL), and photocatalytic degradation tests with radical scavenging experiments.

2：Sample Selection and Data Sources:

Samples were prepared from butyl titanate, HF, and NaOH solutions. Methylene blue (MB) was used as the pollutant. Data were obtained from laboratory experiments and instrument measurements.

3：List of Experimental Equipment and Materials:

Materials included butyl titanate, hydrofluoric acid, sodium hydroxide, methylene blue, P25, and various chemicals from suppliers like Chengdu Cologne Chemical Co., LTD. Equipment included X-ray diffractometer (XD-2, Beijing Purkinje), SEM (JEOL JSM6700), HRTEM (Tecnai G2 F20, FEI), BET analyzer (Micromeritic TriStar II 3020), FT-IR spectrometer (TENSOR27, Bruker), UV-vis DRS (Shimadzu 2600), PL spectrophotometer (Hitachi F-2700), and UV-vis spectrophotometer (UV1901).

4：1). Experimental Procedures and Operational Workflow:

4. Experimental Procedures and Operational Workflow: {001}TiO2 was synthesized hydrothermally, then treated with NaOH solutions. Characterization was performed using the listed instruments. Photocatalytic tests involved degrading MB under a xenon lamp, with samples taken periodically for UV-vis analysis. Radical scavenging used potassium iodide, terephthalic acid, and quinone.

5：Data Analysis Methods:

Data were analyzed using techniques like XRD peak identification, BET surface area calculation, PL intensity measurement for recombination rates, and UV-vis absorbance for MB concentration via Lambert-Beer's law.