CO2 capture of amino functionalized three-dimensional worm-hole mesostructured MSU-J silica

Abstract

Tetraethylenepentamine (TEPA) was employed to functionalize the large-pore mesoporous silica (denoted MSU-J) with 3D worm-hole framework structures which was prepared through a supramolecular hydrogen-bonding assembly pathway from low-cost H 2 NCH(CH 3 )CH 2 [OCH 2 CH(CH 3 )] 33 NH 2 (D2000) as structure-directing porogens and tetraethylorthosilioate as the silica source for capturing CO 2 . The resultant adsorbents were characterized by FT-IR, Transmission electron microscopy (TEM), N 2 adsorption/desorption and thermogravimetric analysis. Textural properties, elemental analysis and TEM measurement of the samples showed a severe pore filling of MSU-J as TEPA loading was increased to 70 wt%. CO 2 adsorption isotherms measured at different temperatures revealed the optimal adsorption temperature is 25°C. The adsorption capacity of MSU-J with different TEPA loading contents was calculated. As a result, 50 wt% of TEPA supported on as-synthesized MSU-J achieved the highest capacity with the value of 164.3 mg/g under the conditions of 99.99 % CO 2 at 25°C and 0.1 MPa. Repeated adsorption/desorption cycles revealed that amine-impregnated materials was very efficient for less apparent decrease in CO 2 adsorption capacity even after 6 adsorption-regeneration cycles.

Amine-Functionalized Mesoporous Silica @ Reduced Graphene Sandwichlike Structure Composites for CO2 Adsorption

“…Figure shows the FT-IR spectra of mSiO 2 @rGO-based sandwichlike structure composites. The bonds at about 798, 1074, and 1227 cm –1 refer to asymmetric and symmetric Si–O–Si stretches, respectively, which dominated the spectra of all samples, indicating that functionalization did not destroy the mesoporous structure of mSiO 2 @rGO . The FT-IR bands around 1381 and 3428 cm –1 could be assigned to the O–H stretching vibration of the Si–OH groups and adsorbed water molecules .…”

“…The bonds at about 798, 1074, and 1227 cm −1 refer to asymmetric and symmetric Si−O− Si stretches, respectively, which dominated the spectra of all samples, indicating that functionalization did not destroy the mesoporous structure of mSiO 2 @rGO. 24 The FT-IR bands around 1381 and 3428 cm −1 could be assigned to the O−H stretching vibration of the Si−OH groups and adsorbed water molecules. 25 And the appearance of absorption peaks of N−H bonds (1568 and 3366 cm −1 ) and Si−C bonds (697 cm −1 ) can be seen on the mSiO 2 @rGO-NH 2 sandwichlike structure composites, which is Si−OH reacted with the APES to lead the -NH 2 grafted onto the mSiO 2 @rGO sandwichlike structure composite.…”

Adsorptive capture of CO2 by amine‐impregnated activated carbon, pumice, and zeolite 4A

“…Between the textural properties of porous supports used, the pore size and volume were more effective especially on amine loading and CO 2 capture. Porous materials with large pore structure and volume are promising materials for adsorptive CO 2 removal due to their physical amine loading and low diffusion resistance 29,30,43 . The higher surface area of activated carbon and its partially mesoporous state resulted in more amine loading than the pumice.…”

“…Therefore, the impregnated amine should have a high boiling point to prohibit leaching and the adsorption experiments must be conducted at low operating temperature 27 . The stacked amine molecules inside narrow pores also create a diffusional problem for CO 2 28–30 . However, grafted adsorbents have some benefits such as strong bond interaction between amine and functional groups, accessible pores, and enhancing cycling stability 15 .…”

A novel hybrid functional nanoparticle and its effects on the dielectric, mechanical, and thermal properties of cyanate ester

“…Mesoporous silicas were synthesized according to reference , the Jeffamine D2000 surfactant was dissolved in ethanol and then the desired amount of water was added under stirring. Subsequently, TEOS was added to the surfactant solution under vigorous stirring at ambient temperature.…”