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Sorption capacity and competitive sorption behavior of EDTA-functionalized CS composite sorbent (CSZ-EDTA) at pH = 4 (A) and pH = 6 (B) in a binary system. Sorbent dosage = 0.4 g L−1; contact time = 24 h; T = 21 ± 1 °C; initial Cu(II), Co(II) or Fe(III) concentration = 50 mg L−1. Note: At pH 6, only the system containing Cu and Co ions was studied because Fe ions precipitate at this value.
