Nanostructured Titania–Diphosphonate Hybrid Materials with a Porous Hierarchy

Abstract

An organic-inorganic hybrid nanostructured material of titania-diphosphonate (Ti-HEDP) was prepared from a simple self-assembly process with the precursor tetrabutyl titanate and 1-hydroxyethane-1,1-diphosphonic acid (HEDP). The prepared hybrid Ti-HEDP has a semicrystalline anatase phase, exhibiting a hierarchical macroporous structure composed of mesostructured Ti-HEDP nanorods with a length of 80-150 nm and a thickness of 18-38 nm. The BET surface area is 257 m 2 /g. The 1-hydroxyethane-1,1-diyl-bridged organophosphonate groups were homogeneously incorported

Organic‐Additive‐Assisted Synthesis of Hierarchically Meso‐/Macroporous Titanium Phosphonates

“…[38] The broadening of the resonance signal is due to the disordered or low-crystalline nature of the solids. This signal has similar chemical shifts found for PhP(OTi) 3 units in molecular oxophosphonato titanium clusters of phenylphosphonate-TiO 2 hybrids [28,29] and for diphosphonate groups (ϵP-CH 2 -Pϵ) in mesoporous aluminum phosphonates. [14][15][16] No sharp 31 P NMR resonance signal at -4 ppm is observed, which indicates that a layered titanium phosphonate phase [28] is not present in the synthesized hierarchically porous materials, which is further supported by TEM and IR spectroscopy.…”

“…[24] Materials with hierarchically meso-/macropores have enhanced properties relative to those of single-sized porous materials because of increased mass transport and reduced diffusion resistance through the material and the maintenance of a specific surface area on the level of fine pore systems. [21] For example, superior photocatalytic activity has been observed in hierarchically meso-/macroporous titanias because of the light-harvesting macroporous channels, [25] and metal phosphonates [26,27] and oxide-phosphonate hybrids [28,29] with porous hierarchy have exhibited enhanced catalytic activity and adsorption capacity. In this work, we describe a simple strategy for the preparation of titanium phosphonate materials with a hierarchically meso-/macroporous structure, constructed with an aminobridged alkylenephosphonic acid as the coupling molecule.…”

New Hybrid Materials Synthesized with Different Dyes by Sol-Gel Method

“…The band at 1482 cm −1 was ascribed to P-C stretching vibration which is overlapped with C-H bending of CH 2 groups [40] and one at 1627 cm −1 is due to the stretching vibration of phenylphosphonic acid. The P-C stretching modes at 1482 cm −1 and around 750 cm −1 were assigned to the presence of P-C aromatic, observed in all hybrids.…”

Metal Phosphonate Hybrid Mesostructures: Environmentally Friendly Multifunctional Materials for Clean Energy and Other Applications

“…The nanorods formed aggregates with the microemulsions to give a hierarchical macroporous structure. [32] The multi-point BET surface area was 257 m 2 g À1 , with a BJH pore size of 2.0 nm and a total pore volume of 0.263 cm 3 g…”