CO2 adsorption on branched polyethyleneimine-impregnated mesoporous silica SBA-15

Influence of Drying Conditions on Amine-Functionalized SBA-15 as Adsorbent of CO2

“…An alternative is to develop new selective adsorbent materials that reach high CO 2 adsorption capacities at atmospheric pressure and at a temperature higher than 45°C. The functionalization of porous materials with organic molecules containing amino groups is aiming to a double objective: first, amino-functionalized materials can be very selective, providing higher CO 2 adsorption capacities at lower pressures [12], and second, grafted amino group-containing molecules on the adsorbent surface of solid materials are less toxic and corrosive compared to the liquid phase amine molecules, and can be more easily regenerated. Amine basic functionalities chemically react with CO 2 acidic molecules, producing stable carbamate species [13].…”

“…Pluronic P123 (PEO 20 PPO 70 PEO 20 , Mn*5800, SigmaAldrich) was used as a structure directing agent and TEOS (tetraethyl orthosilicate, 98 %, Sigma-Aldrich) as a silica source. A large scale synthesis was performed obtaining up to 40 g of SBA-15, following a procedure previously reported by our group [12]. In summary, the desired amount of Pluronic P123 was dissolved in a 1.9 M hydrochloric acid solution and the mixture stirred until complete dissolution.…”

“…Impregnation with organic molecules over several supports has been extensively studied. Among other aminated molecules, poly-ethyleneimine (PEI) [12,[16][17][18][19][20][21][22] and tetraethylene-pentamine (TEPA) [21][22][23][24][25][26][27][28] are presented as convenient compounds since both of them contain a large number of amino groups in the molecule. In particular, silica SBA-15 impregnated with PEI shows adsorption capacity values at 45°C up to 88 mg CO 2 /g at a pressure of 1 bar of pure CO 2 [12].…”

Efficient CO2 sorbents based on silica foam with ultra-large mesopores

“…A series of solid-supported amine sorbents, based on bulk mesoporous silica including MCM-41, MCM-48, SBA-12, SBA-15, SBA-16, and KIT-6, has been prepared via wet impregnation and evaluated. [6][7][8][9][10][11][12][13][14][15] They show fast CO 2 adsorption kinetics and enhanced capacity compared to those based on aqueous amine solutions, e.g. $1.25 mmol g À1 for 30% monoethanolamine (MEA) solution.…”

Investigation of Acid Blue 62 Dye Adsorption using SBA-15/Polyaniline Mesoporous Nanocomposite: Kinetic and Thermodynamic Study

“…The amine group plays a key role in determining the medicated silica mesoporous adsorbents performance. Various amines have been tested including alkanolamines (31), amine-containing silanes, such as 3-amino propyl trimethoxysilane (32), oligomeric amines, such as polyethyleneimine (PEI) (33) and tetraethylenepentamine (TEPA) (34), and conductive electroactive polymeric compounds, such as polypyrrole (PPy) (35)and polyaniline (PAni) (36). In the last decade, PAni has gained so much attention for its suitable polymers due to their sufficient electrical conductivity, low-cost monomer, nontoxicity, forming adhesive coating by different substrates, electrochemical properties, and their unique features to hybrid with inorganic mesoporous compounds, as well.…”