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http://pubs.acs.org/doi/abs/10.1021/la9017486

Layer-by-Layer Grafting of Titanium Phosphate onto Mesoporous Silica SBA-15 Surfaces: Synthesis, Characterization, and Applications

Jianan Zhang†‡, Zhen Ma†, Jian Jiao†, Hongfeng Yin†, Wenfu Yan‡, Edward W. Hagaman†, Jihong Yu*‡ and Sheng Dai*†

Langmuir, Article ASAP
DOI: 10.1021/la9017486

Abstract
Metal phosphates have many applications in catalysis, separation, and proton conduction, but their small surface areas and/or constrained pore structures limit their utilization. Here, we report two new methods for the liquid-phase grafting of titanium phosphate onto mesoporous silica (SBA-15) surfaces: (1) alternate grafting of Ti(OPri)4 and then POCl3 and (2) one-pot grafting of titanium phosphate formed in situ by employing Ti(OPri)4 (a base) and POCl3 (an acid) as an appropriate ¡°acid−base pair¡±. Both the size of mesopores and the content of titanium phosphate can be changed by increasing the number of modification cycles in a stepwise (or layer-by-layer) fashion. The obtained products were characterized by inductively coupled plasma optical emission spectroscopy, X-ray diffraction, N2 adsorption−desorption, transmission electron microscopy, 31P and 29Si magic-angle spinning NMR, and NH3 temperature-programmed desorption, and their performance in acid catalysis and metal ion adsorption was investigated. This work provides new methodologies for the general synthesis of supported metal phosphates with large surface areas, ordered nanoporous structures, and acid properties.

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