Effect of adsorbent dose and pH on the removal efficacy. (a) UV-vis spectra of 25 mg/L of MB solution before and after treatment with different doses of Fe₃O₄/PS composites (from 4 mg to 40 mg) at 25 °C for 15 min, (b) the relationship between the adsorbent dose and the removal efficiency of MB, and (c) the effect of the pH on the removal efficiency.

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