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(a) Effect of contact time on Pb(II) adsorption capacity, (b) pseudo-first-order, (c) pseudo-second-order, and (d) intraparticle diffusion kinetic models (d) for the adsorption of Pb(II) onto SPEN-CTAB-0%, SPEN-CTAB-5% and SPEN-CTAB-15%, respectively.
