Abstract
A family of hybrid surface-phosphonated titania, titania–phosphonate, and titanium phosphonate porous materials with different organic groups in the network was synthesized by utilizing a series of organophosphonic acids as the coupling molecules. The crystalline degree of the obtained hybrids decreased by increasing the original added coupling molecule amount, with the structural phase transformed from phosphonated titania to titanium phosphonate, and simultaneously the nanoarchitecture changed from mesoporous to hierarchically meso-/macroporous structure. The whole synthesis process was performed under a very wide pH range by a template-free strategy. The samples were characterized by XRD, N2 sorption, SEM, TEM, FT-IR, MAS NMR, XPS, and TG-DSC analysis. It is revealed that the integrity of organic groups remained inside the framework of the synthesized hybrids. All the synthesized adsorbents exhibited large capacity of heavy metal ion adsorption with a definite selectivity, which depended on the nature and positions of organically functional groups.
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Acknowledgements
This study was supported by the National Natural Science Foundation of China (No. 20473041 and 20673060), the National Basic Research Program of China (No. 2009CB623502), the Specialized Research Fund for the Doctoral Program of Higher Education (20070055014), the Natural Science Foundation of Tianjin (08JCZDJC21500), the Program for New Century Excellent Talents in University (NCET-06-0215), and Nankai University.
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Ma, TY., Zhang, XJ. & Yuan, ZY. High selectivity for metal ion adsorption: from mesoporous phosphonated titanias to meso-/macroporous titanium phosphonates. J Mater Sci 44, 6775–6785 (2009). https://doi.org/10.1007/s10853-009-3576-7
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DOI: https://doi.org/10.1007/s10853-009-3576-7