Cyclophosphazene-Based Hybrid Nanoporous Materials as Superior Metal-Free Adsorbents for Gas Sorption Applications

Abstract

Cyclophosphazene-based inorganic-organic hybrid nanoporous materials (CHNMs) have been synthesized by a facile solvothermal method. The condensation of pyrrole with the reaction product of phosphonitrilic chloride trimer and 4-hydroxybenzaldehyde resulted in the formation of high-surface-area CHNMs. The maximum specific surface area (SA) of 1328 m g with hierarchical pore structures having micropores centered at 1.18 nm and mesopores in the range of 2.6-3.6 nm was estimated from the N sorption analysis. Observation of high SA could be attributed to the synergy effect exerted by the cyclophosphazene moiety owing to its three-dimensional paddle wheel structure. The metal-free adsorbent exhibited a high and reversible CO uptake of 22.8 wt % at 273 K and 1 bar. The performance is on the higher side among the reported metal-free inorganic-organic hybrid nanoporous adsorbents. Moreover, the high H uptake of 2.02 wt % at 77 K and 1 bar is an added advantage. The superior performance of the adsorbents for the gas sorption applications could be attributed to the combined effect of high SA and hierarchical pore structure, which has made CHNMs good candidates for energy and environmental applications.

Rational Synthesis of Chabazite (CHA) Zeolites with Controlled Si/Al Ratio and Their CO2/CH4/N2 Adsorptive Separation Performances

“…Much attention has been directed towards the separation and capture of CO 2 from various effluent gases, especially from dilute-purity sources (< 5% CO 2 ). [1][2][3] Moreover, methane( CH 4 )i sc onsidered asar elatively clean energyc ompared with other conventional fossil fuels. Natural gas reserves generally contain different amountso fC O 2 ,w hich will lower the heating value of the energy and result in pipeline corro-sion.…”

A POSS‐Phosphazene Based Porous Material for Adsorption of Metal Ions from Water

“…Phosphazene cyclomatrix polymers are highly cross‐linked and can be obtained by nucleophilic substitution reaction of chlorocyclophosphazenes with phenols or amines . Practical applications of these materials as efficient adsorbents for dyes, iodine or for CO 2 storage have been reported. Nevertheless, the use of phosphazene cyclomatrix materials for adsorption of metal ions has not been adequately addressed so far.…”

“…[42] Phosphazene cyclomatrix polymers are highlyc ross-linked and can be obtained by nucleophilic substitution reactiono fc hlorocyclophosphazenes with phenols or amines. [43] Practical applications of these materials as efficient adsorbents for dyes, [44] iodine [45] or for CO 2 storage [46][47][48][49][50] have been reported. Nevertheless,t he use of phosphazene cyclomatrixm aterials for adsorption of metal ions has not been adequately addressed so far.O zcan et al have reported the synthesis of phosphazene microspheres by reacting hexachlorocycltriphosphazene( HCCP) or octachlorocycltetraphosphazene (OCCP) with diaminodiphenylmethane [51] and demonstrated their use for removal of Pb 2 + ions from water.L iet alh ave reported the application of ap orousp hosphazene-based crosslinked polymerf or effective extraction of uraniumi ons from water.T he hybrid polymer was prepared by reacting HCCP with phenylenediamine, hydroquinone and phlorogluci-nol.…”

The catalytic performance study of polymerized ionic liquid synthesized in different conditions on alkylation of o‐Xylene with styrene

“…Up to date, it has been widely used in the field of battery, adsorption, mechanical functional materials and so on. Nanoporous materials based on poly ionic liquid had dual advantages of porous materials and poly ionic liquids, and had already been applied on organic catalytic reactions, batteries and functional materials . Thus, it is probably likely that porous materials have been considered as the most promising catalysts for alkylation.…”