Surfactant-assisted synthesis of a novel macroporous tin organophosphonate with mesoporous walls
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A novel hierarchically mesoporous–macroporous tin organophosphonate with intra-framework organic groups is successfully fabricated through a facile hydrothermal route with SnCl4·5H2O as tin source and diethylene triamine pentakis(methylphosphonic acid) as organophosphorus source in the presence of cetyltrimethylammonium bromide (CTAB) as the templating agent. The as-prepared hybrid had macroporous structures with the pore size in the range of 0.6–2.1 μm and a specific surface area of 170 m2/g. Besides, the pore walls had particle-aggregated mesoporous substructures, consisting of amorphous tin organophosphonates, as characterized by SEM, TEM and N2 adsorption analysis and wide- and low-angle X-ray diffraction. FT-IR and NMR results indicated the integrity of the organophosphonate groups into the hybrid solid. It was found that the surfactant CTAB played an important role in obtaining macropores, and a possible formation route was proposed.
This work was supported by the National Natural Science Foundation of China (No. 21503041), Technology Planning Project of Guangdong Province (No. 2015B090927007) and Guangdong Provincial Key Platform and Major Scientific Research Projects for Colleges and Universities (No. 2015KCXTD029).