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The present work discusses the removal of crystal violet dye from aqueous solution by ultrasound assisted adsorption using zinc oxide nanorods loaded on activate carbon as an adsorbent. The said adsorbent was prepared and characterized using field emission scanning electron microscopy, X-ray diffraction and Fourier transform infrared analysis. The important process parameters, such as initial crystal violet concentration (8–24 mg/L), solution pH (3.0–7.0), adsorbent doses (0.005–0.025 g), and sonication time (2–6 min) were optimized using design of experiments. The optimum removal efficiency of crystal violet onto adsorbent was determined as 99.82% at pH 7.0, 0.025 g adsorbent dosage, 24 mg/L initial crystal violet concentration and 5.0 min sonication time. Analysis of variance showed a high coefficient of determination (R² = 0.992). The present analysis suggests that the predicted values are in good …