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Self-organized inorganic-organic phyllosilicate hybrids: investigating bridging ligands and imprinting methods for heavy metal ion adsorption
No full textThe talc-like organoclay, MgSi-b-en, was synthesized using a bridged
organosilane precursor containing the ethylenediamine moiety through the sol-gel
process. Characterization of the material revealed disordered, interconnected
phyllosilicate sheets, with a high surface area and a composition resembling natural talc.
Ethylenediamine moieties were successfully incorporated into the structure of MgSi-b-en.
The material performed well as an adsorbent of the heavy metal ions Cu(II), Ni(II), and
Pb(II). The adsorption capacities of the adsorbent were very high. Multi-component
adsorption tests revealed a specific adsorption preference of Pb > Cu > Ni. An ionimprinting
technique was performed to alter the specificity of the adsorbent. The
procedure produced organoclays with cavities matching the size of the metal ion used in
the synthesis. In the presence of larger ions, the two imprinted adsorbents, MgSi-b-en(-
Cu) and MgSi-b-en(-Ni), displayed higher adsorption capacities and selectivity
coefficients towards Cu(II) and Ni(II) ions, respectively
