Metakaolin-Based Geopolymers for Targeted Adsorbents to Heavy Metal Ion Separation

DOI: 10.4236/msce.2014.27002   PDF   HTML   XML   3,626 Downloads   5,858 Views   Citations


Geopolymer adsorbents were prepared from silica and metakaolin in different Al and Si components and applied for removal of metal ions, Cs+ and Pb2+, from other heavy metal ions mixture. The geopolymer was optimized at Si/Al = 2 as adsorbent, targeting to Cs+ and Pb2+ separation. The binding behavior was well fitted to Langmuir model, which proved that the metakaolin-based geopolymer had multibinding to adsorb ions. The effective adsorption was also observed independent of NaCl concentration for the Cs+ and Pb2+. This meant that the ion adsorption of geopolymers occurred under non-electrostatic mechanism.

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López, F. , Sugita, S. , Tagaya, M. and Kobayashi, T. (2014) Metakaolin-Based Geopolymers for Targeted Adsorbents to Heavy Metal Ion Separation. Journal of Materials Science and Chemical Engineering, 2, 16-27. doi: 10.4236/msce.2014.27002.

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The authors declare no conflicts of interest.


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