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| - Synthesis of Mesostructured and Mesoporous AluminumOrganophosphonates Prepared by Using Diphosphonic Acids withAlkylene Groups
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| - Mesostructured and mesoporous aluminum organophosphonates (AOPs) with 2-D hexagonal structures(AOP-2) can be synthesized by using alkylene diphosphonic acids in the presence of alkyltrimethylammonium (CnTMA) surfactants. In the aqueous system, mesostructured AOP-2 with short-range orderingswas obtained by using methylene diphosphonic acid. Low-temperature calcination at 400 °C of themesostructured AOP-2 led to the deformation of the mesostructures. In the ethanol−water system, highlyordered mesostructured AOP-2 can be prepared through the reaction of aluminum chloride and alkylenediphosphonic acids. The preparation of ordered mesoporous AOPs with methylene and ethylene groupswas achieved by using the method to remove surfactant molecules by calcination at 400 °C. MesoporousAOPs containing propylene groups cannot be obtained through a similar synthetic procedure containingthe low-temperature calcination process. Thermal stabilities of the organic groups within the frameworksare significant for the formation of mesoporous phases. Also, the presence of the organic groups withinthe frameworks plays an important role in avoiding the deformation of the ordered mesostructures duringcalcination. The mesoporous AOP-2 having extremely hydrophilic surfaces is quite applicable for theremoval of harmful organic compounds such as aldehydes.
- Ordered mesoporous aluminum methylene- and ethylene-diphosphonates can be prepared by using the corresponding alkylene diphosphonic acids in the presence of amphiphilic molecules such as alkyltrimethylammonium surfactants.
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