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The functionalization of multi-walled carbon nanotubes (MWCNTs) was using with ethylenediamine and cyanuric chloride and sodium 2-mercaptoethanol as efficient ways to introduce amine and thiol functional groups onto the nanotube sidewalls. The synthesized amino and thiolated MWCNTs were characterized by Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS) and scanning electron microscope (SEM). A series of batch adsorption experiments were conducted to study the effect of pH, dose, metal concentration and temperature on Hg(II) uptake by the functionalized, MWCNTs. The isotherm data were analyzed for possible agreement with the Langmuir than Freundlich models, while the equilibrium data were fitted better by Langmuir model. The pseudo-first-order and pseudo-second-order rate equations were tested on kinetic

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