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The present study devoted to description of efficient removal of radioactive UO₂²⁺ ions (U(IV)) via complexation with Arsenazo III (ARS III) accelerated by ultrasound-assisted adsorption onto the Au-NPs supported on carbon nanotubes (Au-NPs-CNTs), which were characterized by conventional techniques such as FESEM, EDS and XRD. Central composite design (CCD) employed to model contribution of parameters viz. pH (2.5–8.5), adsorbent mass (5–25 mg), UO₂²⁺ concentration (5–25 mg L⁻¹) and sonication time (1–5 min) onto response. The predicted results optimum conditions corresponding achievement of maximum UO₂²⁺ removal efficiency are pH 5.5, 20 mg of Au-NPs-CNTs, is highly applicability for removal of more than 98% of 25 mg L⁻¹ of UO₂²⁺ following 5 min sonication. Through analysis of corresponding results based on evaluation according to UO₂²⁺ concentration were found significantly …