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Reactive sorption of mercury(II) on to poly(m-phenylenediamine) microparticles

Poly(m-phenylenediamine) (PmPD) microparticles, from the monomer with two amino groups, were synthesized through chemical oxidation, and the strong adsorbability of mercury ions on to PmPD was systematically examined. The results revealed a rapid adsorption process with an equilibrium time of 30 minutes. Also, the adsorption behaviour showed that the adsorption kinetics was in good agreement with the pseudo-second-order equation. The maximum uptake capacity for mercury (Q max) reached approximately 955 mg g−1 at 0.02 M NaNO3 and 25 °C, which decreased appreciably with the increasing of salt concentration. The amount of mercury sorbed at equilibrium steadily increased as the temperature rose from 25 to 45 °C, which can be indicative of an endothermic process. The pH value of the solution seemed to exhibit little influence on the adsorption capacity. The adsorption mechanisms, including Hg2+ complexation with nitrogen and ion exchange between Hg2+ and H+ on PmPD chains, are proposed on the basis of Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS) analysis.