Real sample application. (a) Reusability studies of 100 mg of Fe₃O₄/PS composites in terms of removal efficiency changes for the capturing properties of 15 mg/L of MB after five regeneration/reuse cycles, (b) Selectivity of Fe₃O₄/PS composite toward MB in the presence of the MO ionic dye, and (c) monitoring of MB in industrial wastewater samples.

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