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Cubic mesoporous titanium phosphonate materials with bridged organic groups inside the framework were synthesized by means of a one-pot hydrothermal autoclaving process, with the assistance of cationic surfactant cetyltrimethylammonium bromide. 1-Hydroxyethylidene-1,1-diphosphonic acid was used as the coupling molecule. A typical cubic mesophase with surface area of 1052 m(2) g(-1) and pore size of 2.6 nm was confirmed by XRD, TEM, and N(2) sorption analysis. The organophosphonate groups were homogeneously incorporated in the network of the mesoporous solids, as revealed by FTIR and magic-angle spinning (MAS) NMR spectroscopy, and thermogravimetry and differential scanning calorimetry (TG-DSC) measurements. The synthesized hydroxyethylidene-bridged cubic mesoporous titanium phosphonates proved to be thermally stable up to 350 degrees C, with a well-preserved hybrid framework and cubic mesoporous architecture. The obtained cubic mesophase could be transformed into a hexagonal mesophase by simply adjusting the molar ratios of the added raw materials, namely, a Ti/P molar ratio of 1:4 and a CTAB/Ti molar ratio of 1.9-2.3 for the cubic phase and Ti/P molar ratio of 3:4 and CTAB/Ti molar ratio of 0.1-0.4 for the hexagonal phase. The cubic hybrid materials could be used as efficient photocatalysts for the photodegradation of rhodamine B. Moreover, they were also used for adsorption of CO(2) and heavy metal ions and exhibited a significant capture amount of around 1.0 mmol g(-1) for CO(2) molecules at 35 degrees C and high adsorption capacity of 28.5 micromol g(-1) for Cu(2+) ions with good reusability, which demonstrated their promising potential in environmental remediation.

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Inorganic-organic hybrid titanium phosphonate materials with a hierarchically-porous structure were synthesized by a mild solvent evaporation strategy using 1-hydroxyethylidene-1,1diphosphonic acid as an organophosphorus coupling molecule. The preparations were accomplished with the use of triblock copolymers F127 and P123 as structure-directing agents. All the samples possessed a macroporous morphology of the mesoporous framework with a high surface area, and were characterized by SEM, TEM and N 2 sorption analysis. The hydroxyethylidene-bridged organophosphonate groups were homogeneously incorporated into the network of the hierarchical porous solid, as revealed by FT-IR, MAS NMR, TGA-DSC and XPS measurements. The hybrid materials were used as adsorbents for the liquid phase adsorption of Cu 2+ ions in water and the gas phase adsorption of CO 2 , showing high adsorption capacity and good reusability, which makes them promising adsorbents for practical applications in environmental remediation.

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Mesoporous zirconium phosphonate materials with bridged organic groups in the framework were hydrothermally synthesized with 1‐hydroxyethylidene‐1,1‐diphosphonic acid as coupling molecule and cetyltrimethylammonium bromide as template. The mesostructure is wormhole‐like with a specific surface area of 702 m2/g and a uniform pore size of 3.6 nm, and the organophosphonate groups are homogeneously integrated in the network of the obtained solids. The hydroxyethylidene‐bridged mesoporous zirconium phosphonates can serve as solid‐acid catalysts for the synthesis of methyl‐2,3‐O‐isopropylidene‐β‐D‐ribofuranoside from D‐ribose and exhibit high catalytic activity with rapid reaction rate, which are comparable to the catalytic performance when liquid acid HCl or commercial ion‐exchange resin NKC‐9 is used as catalyst. Furthermore, mesoporous zirconium phosphonates show high stability with good reusability without any loss of catalytic activity after five cycles, which demonstrates their potential for industrial applications.

Mesoporous zirconium phosphonates were used as highly effective catalysts for the heterogeneously catalyzing cycloaddition reaction between aziridines and CO2.

Hierarchically macro-/mesoporous titanium phosphonates with enlarged H(+) exchange capacity were synthesized in the presence of a series of alkyl amines that acted as protective groups for the defective P-OH, which were used as promising solid acid catalysts to replace conventional liquid acid catalysts and acidic resins in some acid-catalytic reactions.