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Heavy metal removal of tri-amino-functionalized sol–gel hybrids with tailored characteristics

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Abstract

Adsorption of heavy metal ions from aqueous solutions on tri-amino-functionalized silica hybrids with tailored structural characteristics was investigated. The adsorbents were prepared using a controllable sol–gel method with (3-aminopropyl)trimethoxysilane or 3-[2-(2-aminoethylamino)ethylamino] propyltrimethoxysilane, polymeric polymethylhydrosilane and tetraethoxysilane as co-precursors in the absence of traditional surfactant aggregates. These as-prepared hybrids possess tailored structures with high specific surface area, large pore volumes and relatively narrow pore diameter as confirmed by transmission electron microscopy and nitrogen sorption results. The elemental analysis and FT-IR indicated that amino groups had been successfully introduced into the opened skeletons. The loadings of amino moieties of the amino-functionalized gels could be tuned from 5 to 40% by adjusting the molar ratio of organoalkoxysilane/silica in the synthesis system. The heavy metal adsorption experiments have been examined for Cu(II), Pb(II), Ni(II), Cd(II) and Zn(II) from aqueous solution employing batch method. The results showed that the adsorption capacity of the tri-amino-functionalized adsorbents was higher than that of the mono-amino-functionalized counterparts, illustrating a good potential for environmental remediation in virtue of the combination of selective adsorption performance and large-scale synthesis character.

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Acknowledgments

Financial supports from the University Scholarship of Liaoning Province (No. LR201005), the Scientific Program of Dalian Government (No. 2010J21DW021) and the Natural Science Foundation of Liaoning Province (No. 2010401) are gratefully acknowledged.

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Authors and Affiliations

  1. Faculty of Light Industry and Chemical Engineering, Dalian Polytechnic University, Dalian, 116034, China

    Yu Zhao, Shang-Ru Zhai, Bin Zhai & Qing-Da An

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  1. Yu Zhao
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  2. Shang-Ru Zhai
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  3. Bin Zhai
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  4. Qing-Da An
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Correspondence to Shang-Ru Zhai or Qing-Da An.

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Zhao, Y., Zhai, SR., Zhai, B. et al. Heavy metal removal of tri-amino-functionalized sol–gel hybrids with tailored characteristics. J Sol-Gel Sci Technol 62, 177–185 (2012). https://doi.org/10.1007/s10971-012-2706-x

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  • DOI: https://doi.org/10.1007/s10971-012-2706-x

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