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The Langmuir adsorption for Cr ion removal on (A) AC-CS-Alginate nanocomposite and (B) GnZVCu/AC−CS−Alginate nanocomposite and Freundlich adsorption for Cr ion removal on (C) AC−CS−Alginate nanocomposite and (D) GnZVCu/AC−CS−Alginate nanocomposite (sorption time: 40 min; sorbent dosage: 0.4 g/50 mL, pH = 2).
