Tetraphenyladamantane-Based Microporous Polyimide and Its Nitro-Functionalization for Highly Efficient CO₂ Capture

Abstract

A new microporous polyimide network (PI-ADNT) is synthesized from 1,3,5,7-tetrakis(4-aminophenyl)adamantane and naphthalene-1,4,5,8-tetracarboxylic dianhydride. Subsequently, PI-ADNT is nitrated in fuming nitric acid with different nitration time to produce three nitro-decorated porous polyimides (PI-NO2s). Their chemical structures and nitration degrees are characterized by FTIR, solid-state 13C CP/MAS NMR spectra and element analysis. The interesting evolution of porous morphology and porosity of PI-NO2s with nitration time is investigated in detail. The results show that PI-ADNT has the BET surface area of 774 m2 g–1 with microporous size centering at 0.75 nm. After nitration-modifications, PI-NO2s display decreased surface area but remarkably increased CO2 uptake up to 4.03 mmol g–1, which is superior to most of porous polymers reported in the literature. Moreover, the CO2 adsorption selectivites over CH4 and N2 in PI-NO2s are also significantly improved in comparison with PI-ADNT. The CO2 adsorption/separation properties of PI-ADNT and its nitrated products are studied and explained in terms of the variations of porous structure and chemical composition as well as the interaction parameters between CO2 molecule and polymer skeleton such as Henry’s constant, first virial coefficient, and enthalpy of adsorption.

Selective Carbon Dioxide Capture Using Silica‐Supported Polyaminals

“…The solid sorbent has good surface area and moderate CO 2 uptake. When the CO 2 ‐philic groups (Nitrogen containing molecules) are introduced in the solid materials the CO 2 capture capacity and the heat of adsorption are increased . The heat of adsorption of the materials is one of the important factor for improving the CO 2 capture efficiency.…”

“…When the heat of adsorption value is higher than the 50 kJ/mol, high energy is required for regeneration. Therefore, the solid materials are designed by the high surface area as well as moderate heat of adsorption (physisorption range) …”

“…When the CO 2 -philic groups (Nitrogen containing molecules) are introduced in the solid materials the CO 2 capture capacity and the heat of adsorption are increased. [23][24][25] The heat of adsorption of the materials is one of the important factor for improving the CO 2 capture efficiency. The CO 2 -philic groups on solid sorbent are enhancing the strong interaction between CO 2 and surface of the materials, hence the CO 2 capture efficiency is increased.…”

“…Therefore, the solid materials are designed by the high surface area as well as moderate heat of adsorption (physisorption range). [23,26] The porous organic polymers are one of excellent candidates for CO 2 capture applications. Most of the reported sorbent materials for CO 2 capture are made up of nitrogen containing linkers molecules.…”

Synthesis and investigation of the self-assembly behavior of guest block copolymers for supramolecular responsive materials

“…Contrastively, the synthesis of functional guest polymers was lacking 8 . Typically, few functional guest polymers based on adamantane monomer were prepared and used in the development of functional materials 8,9 . Considering that the synthesis process of functional guest monomer was simpler than the preparing of host monomer based on cyclodextrin, the exploration of the synthesis of functional guest monomer in an efficient way is a significant goal.…”