1：Experimental Design and Method Selection:

The study used a static photochemical reactor coupled with FTIR spectroscopy to measure photocatalytic decomposition and oxidation products. Photocatalysts were synthesized via a sol-gel method and characterized using XRD, TEM, SEM, EDS, and UV-Vis DRS.

2：Sample Selection and Data Sources:

BTX gases (benzene, toluene, xylene) were used with initial partial pressures of 200, 210, and 230 mTorr, diluted in synthetic air or inert gas (Ar or N2). Fresh photocatalysts (

3：2). Fresh photocatalysts (100 g) were used in each experiment. List of Experimental Equipment and Materials:

0.100 g) were used in each experiment. 3. List of Experimental Equipment and Materials: Equipment includes a Rigaku D/MAX-2000H XRD diffractometer, JEM-2100 TEM, JSM-6390LV SEM with EDS, Perkin Elmer LAMBDA 950 UV-Vis spectrophotometer, static photochemical reactor with NaCl windows, 300 W Osram UV lamp, 500 W Halogen visible lamp, FTIR spectrophotometer, and thermocouple for temperature control. Materials include titanium(IV) oxysulfate hydrate, ammonium hydroxide, and manganese dopants.

4：Experimental Procedures and Operational Workflow:

Photocatalysts were prepared by precipitation, calcined at 700°C, and characterized. BTX degradation was measured under dark, UV, and visible conditions, monitoring IR absorption peaks. Oxidation products (CO2, CO, H2O) were quantified using FTIR spectroscopy. Surface deposits were analyzed with ATR infrared spectroscopy.

5：Data Analysis Methods:

Data were analyzed using FTIR spectroscopy with Beer-Lambert law for concentration determination, and structural/optical properties were interpreted from XRD and UV-Vis spectra.