KEYWORDS: Mesoporous carbon cmk-3, adsorption, heavy metals, pb (ii), cd (ii), ni (ii).
ABSTRACT: The aim of this study is to investigate the ability of CMK-3 to remove heavy metals (Pb (II), Cd (II) and Ni (II)) from aqueous solution when present singly. CMK-3 was synthesized using the mesoporous SBA-15 silica as structure template and was characterized by XRD, nitrogen adsorption-desoprtion and FT-IR ,  FT-IR spectrum shows that there are many functional groups at the surface of CMK-3. The adsorption process of ions on CMK-3 can be considered very fast, attaining 90% adsorption efficiency within 5 min for Pb (II) and Ni (II), and 10 min for Cd (II). The adsorption capacity of CMK-3 for the removal of Pb (II), Ni (II) and Cd (II) was 199,4, 198 and 180 mg/g of CMK-3, respectively. These capacities values are highest among those reported in the literature. The adsorption capacity was inversely proportional to the hydrated ionic radius of the metals.  The effects of the adsorbent dose, pH and temperature on Pb (II) uptake from aqueous solution have been studied (not shown).The lead removal was pH depende ...
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