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The cefalexin antibiotic was degraded by the 'sea sediment/titanate-UV- Ultrasound-H 2 O 2 ′ system from aqueous media. • Develop a new photocatalyst of "Sea sediment/titanate" to remove cephalexin. • Explore effect of temperature and time in the furnace on photocatalyst properties. • Compute BET (52.29 m2/g) and crystallite size (17.68 nm) for the optimal catalyst. • Remove 94.7% cephalexin by "Sea sediment/titanate-UV- H 2 O 2 -Ultrasonic". • Determine the pathway and mechanism for cephalexin degradation. The aim of the current study was directed to develop a new sea sediment/titanate photocatalyst to remove cephalexin from aqueous media in the presence of ultraviolet (UV) light, hydrogen peroxide (H 2 O 2), and ultrasonic waves. The influence of furnace temperature (300, 350, 400, and 500 °C), furnace residence time (1, 2, 3, and 4 h), and ratio of sea sediment: titanium (0–6 v: w) on the physicochemical properties and the cephalexin removal by the sea sediment/titanate photocatalyst was explored. The technique of FTIR, SEM/EDX, XRD, BET, BJH, and Mapping was used to determine the physicochemical properties of the generated photocatalyst. The maximum cephalexin removal (94.71%) was obtained at the furnace temperature of 500 °C, the furnace residence time of 2 h, and the sea sediment: titanium ratio of 1:6 (=12 mL TiO 2 /2 g sea sediment). According to the acquired results, the surface area of the optimized catalyst, namely Cat-500-2-12, was computed to be 52.29 m2/g. The crystallite size of titanium oxide on the optimum photocatalyst was calculated ~17.68 nm. The FTIR test confirmed the presence of C=C, O-H, C=O, C-S, and C-H functional groups in the photocatalyst. The transformation pathway for the degradation of cephalexin by the developed system was drawn. The present investigation showed that the developed technique (sea sediment/titanate-UV-H 2 O 2 -ultrasonic) could be used as a promising alternative for attenuating cephalexin from aqueous solutions. [ABSTRACT FROM AUTHOR]