Adsorption of copper and lead in aqueous solution onto bentonite modified by 4'-methylbenzo-15-crown-5 [An article from: Journal of Hazardous Materials]

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Description:
The adsorption of heavy metal ions (Cu^2^+ and Pb^2^+) onto organobentonite modified by 4'-methylbenzo-15-crown-5 (MB15C5) from bentonite compared with natural bentonite (N-Bentonite) is described in this paper. The kinetic parameters of the models are calculated and discussed, and closely fitted a pseudo-second-order model in all cases. For bentonite modified with MB15C5 (MB15C5-Bentonite) and N-Bentonite, the equilibrium data closely fitted the Langmuir model and showed the following affinity order: Pb^2^+>Cu^2^+, and the adsorption capacity of MB15C5-Bentonite is higher than that of N-Bentonite for Pb^2^+ and Cu^2^+. The effect of pH is examined over the range 1.5-6. The adsorption of Cu^2^+ and Pb^2^+ increases with increasing pH and the adsorption of Cu^2^+ and Pb^2^+ reaches a maximum at pH 3.5-6.