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The study was focused on the simultaneous removal of Methylene blue (MB) and Safranin-O (SO), as most together hazardous dye in wastewater, from aqueous solution by ultra-sonic-assisted adsorption onto the developed adsorbent i.e. Fe₃O₄ NPs. Fe₃O₄ NPs were synthesized, by using central composite design (CCD), the effects of variables such as pH, adsorbent dosage, MB concentration, SO concentration and contact time on binary dyes removal were examined and optimized values were found to be 6, 0.01 g, 10 and 20 mg/L and 2 min, respectively. The very rapid removal of dyes makes this novel adsorbent as a promising tool for wastewater management applications. Different adsorption isotherm model i.e. Langmuir, Freundlich, non-modified Langmuir, modified competitive Langmuir, modified extended Langmuir, extended Freundlich and sips models are studied out of which extended-Freundlich …