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In this study Fe₂O₃–ZnO–ZnFe₂O₄/C nanocomposite as an efficient adsorbent according to a simple self-propagating solution combustion method was synthesized and subsequently applied for the removal of bromophenol blue (BPB) dye with an ultrasound-assisted method. Carbon is prepared in-situ during the formation of nanocomposite in the form of Pine fruit which act as both fuel and carbon source. The nanocomposites was characterized by various techniques including X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy dispersive X-ray (EDS). The C, Fe, O, and Zn contents in the nanocomposite are found to be 46.14%, 8.56%, 33.24% and 2.64%, respectively. Response surface methodology (RSM) and genetic algorithm (GA) were used for optimization. Using GA, optimum conditions were set at 15, 5.59, 0.005 and 9 for initial dye …