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In this paper, in-situ fabrication of tungsten oxide (WO₃) on carbon nano-tube (CNT) was performed via sol-gel/hydrothermal method to prepare WO₃/CNT nanocomposites and then coupled with visible light and ultrasound (US) irradiations for sono-photocatalytic removal of tetracycline (TTC) and pharmaceutical wastewater treatment. The as-prepared catalysts were characterized by FT-IR, XRD, TEM, UV-VIS DRS, FESEM, EDS, TGA, BET, BJH, EIS, and EDX techniques. The characterization tests, indicated successful incorporation of CTNs into the WO₃ framework and efficient reduction of charge carries recombination rate after modifying with CNT. The investigation of experimental parameters verified that 60 mg/L TTC could be perfectly degraded at optimum operational parameters (WO₃/CNT: 0.7 g/L, pH: 9.0, US power: 250 W/m², and light intensity: 120 W/m² over 60 min treatment. Trapping experiments …