Abstract
A new mesoporous aluminophosphate (AlPO4) has been synthesized through hydrothermal transformation of a lamellar mesostructured aluminophosphate prepared in the presence of a neutral surfactant dodecylamine (DDA) under mild alkaline pH conditions and using water–ethanol mixture as the synthesis medium. Post-synthesis hydrothermal treatment was carried out at 448 K for 72 h in the presence of dilute aqueous phosphoric acid, which results this phase transformation. Lamellar and mesoporous phases of these samples were revealed from powder X-ray diffraction, SEM-EDS, transmission electron microscopic image analysis, 31P MAS NMR a FT IR spectroscopic studies and thermal analysis. N2 sorption studies revealed the existence of pores with dimension of small mesopores after H3PO4 treatment. Pillaring of the interlayers through PO4 units during post-synthesis hydrothermal treatment could be responsible for the transformation of lamellar to mesoporous phase.
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Acknowledgements
KS wishes to thank CSIR, New Delhi for a junior research fellowship. AB wishes to thank Department of Science and Technology, New Delhi, for providing financial assistances. This work was partly funded by the Ramanna Fellowship and NanoScience and Technology Initiative grants of DST, New Delhi.
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Sarkar, K., Bhaumik, A. Hydrothermal transformation of a layered aluminophosphate into a mesoporous structure. J Porous Mater 15, 445–450 (2008). https://doi.org/10.1007/s10934-007-9100-z
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DOI: https://doi.org/10.1007/s10934-007-9100-z