1：Experimental Design and Method Selection:

The study involved synthesizing CTiO2 nanoparticles via the sol–gel method using titanium(IV) butoxide and glycine, followed by characterization and photocatalytic degradation experiments under UV and natural sunlight.

2：Sample Selection and Data Sources:

Aqueous solutions, clean seawater from Sharm Obhur, and polluted seawater from Al-Arbaeen Lagoon were spiked with acetaminophen (AMP) at concentrations from

3：0 to 10 ppm. List of Experimental Equipment and Materials:

Equipment included X-ray diffractometer (Shimadzu XRD-6000), UV-Vis spectrophotometer (Shimadzu PharmaSpec UV-1700), BET surface area analyzer (Quantachrome instrument), SEM (JSM-7600F, JEOL), EDS (X-Max 50 mm2, Oxford Instruments), FT-IR spectrometer (Perkin Elmer), XPS (SPECS surface analysis systems), fluorescence chamber (CC-80, Spectroline) with UV lamp, pyranometer sensor (3670i Silicon Pyranometer Sensor, Spectrum Technologies), and a Pyrex glass reactor. Materials included titanium(IV) butoxide, glycine, ethanol, nitric acid, acetaminophen (GlaxoSmithKline), and pure TiO2 (LOBA, India).

4：Experimental Procedures and Operational Workflow:

The synthesis involved mixing precursors, adjusting pH, stirring, aging, drying, and calcination. Photocatalytic experiments involved equilibrating suspensions in dark, irradiating with UV or sunlight, sampling at intervals, centrifuging, and analyzing AMP concentration via UV-Vis spectrophotometry at 243 nm.

5：Data Analysis Methods:

Kinetic analysis used pseudo-first-order reaction kinetics with rate constants calculated from linear plots of Ln(Co/C) vs. time.