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(a) Contact time of Cu(II), Cd(II), and Pb(II) adsorption by CE–PAANa; (b) pseudo-first-order and (c) pseudo-second-order kinetics; (d) initial metal ion concentrations of Cu(II), Cd(II), and Pb(II) adsorption by CE–PAANa; (e) Langmuir and (f) Freundlich isotherms, respectively.
