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The chelating power of chitosan toward the Cu(II) ions was first enhanced via isatin functionalization, which was cross-linked using epichlorohydrin (ECH) after loading the Cu(II) ions. The discerning steel ions binding web sites are then created by eluting the coordinated Cu(II) ions using EDTA to finally produce the Cu-CIS discerning sorbent. The equilibrium isotherms were useful to anticipate the utmost capability of this Cu-CIS sorbent and compare it with this associa