Functionalized Ordered Mesoporous MCM-48 Silica: Synthesis, Characterization and Adsorbent for CO2 Capture

Abstract

The ordered mesoporous silica MCM-48 with cubic Ia3d structure was synthesized using the cationic surfactant hexadecyltrimethylammonium bromide (CTAB) as a template agent and tetraethylorthosilicate (TEOS) as a silica source. The obtained material was first functionalized with (3-glycidyloxypropyl)trimethoxysilane (KH560); further, two types of amination reagents were used: ethylene diamine (N2) and diethylene triamine (N3). The modified amino-functionalized materials were characterized by powder X-ray diffraction (XRD) at low angles, infrared spectroscopy (FT-IR) and nitrogen adsorption–desorption experiments at 77 K. Characterization from a structural point of view reveals that the ordered MCM-48 mesoporous silica has a highly ordered structure and a large surface area (1466.059 m2/g) and pore volume (0.802 cm3/g). The amino-functionalized MCM-48 molecular sieves were tested for CO2 adsorption–desorption properties at different temperatures using thermal program desorption (TPD). Promising results for CO2 adsorption capacities were achieved for MCM-48 sil KH560-N3 at 30 °C. At 30 °C, the MCM-48 sil KH560-N3 sample has an adsorption capacity of 3.17 mmol CO2/g SiO2, and an efficiency of amino groups of 0.58 mmol CO2/mmolNH2. After nine adsorption–desorption cycles, the results suggest that the performance of the MCM-48 sil KH N2 and MCM-48 sil KH N3 adsorbents is relatively stable, presenting a low decrease in the adsorption capacity. The results reported in this paper for the investigated amino-functionalized molecular sieves as absorbents for CO2 can be considered as promising.

Cellulose–Amine Porous Materials: The Effect of Activation Method on Structure, Textural Properties, CO2 Capture, and Recyclability

“…Therefore, developing efficient, ecological, and low-cost CO 2 capture materials is urgently required. Porous materials such as activated carbons [ 15 , 16 ], carbon nanotubes [ 17 , 18 ], covalent–organic frameworks [ 19 , 20 ], metal–organic frameworks [ 21 , 22 , 23 , 24 ], zeolites [ 25 , 26 , 27 ], mesoporous silicas [ 28 , 29 , 30 ], and natural materials based on nanoporous shales, limestones, and foams [ 31 , 32 , 33 , 34 ] stand out as promising frontiers in the quest for effective carbon capture and storage technologies. Recently, sorbents based on activated porous carbons (APC) have received increased interest because of their unique physio-chemical properties, such as high surface area [ 35 , 36 ], tunable pore distribution [ 37 ], and the possibility of chemical modification for enhanced affinity to CO 2 molecules [ 38 , 39 , 40 ].…”

An Immobilized Amine with Improved Cyclic Performance Prepared from Carboxyl Modified Mesoporous Silica for CO2 Capture

“…Mesoporous silica is functionalized by organic molecules and then grafted with amine functional groups for adsorption of CO 2 . For example, Silvana Borcănescu et al [24] functionalized MCM-48 with (3-glycidyloxypropyl) trimethoxysilane (KH560) and then grafted two amination reagents, ethylene diamine (N2) and diethylene triamine (N3). The ordered MCM-48 mesoporous silica has a highly ordered structure, large specific surface area (1466.059 m 2 • g À 1 ) and pore size (0.802 cm 3 • g À 1 ).…”

“…Mesoporous silica is functionalized by organic molecules and then grafted with amine functional groups for adsorption of CO 2 . For example, Silvana Borcănescu et al [24] . functionalized MCM‐48 with (3‐glycidyloxypropyl) trimethoxysilane (KH560) and then grafted two amination reagents, ethylene diamine (N2) and diethylene triamine (N3).…”

Amine-Impregnated Dendritic Mesoporous Silica for the Adsorption of Formaldehyde

“…Among them, research on silica materials with excellent cost-effective performance has rapidly increased [ 25 , 26 , 27 ]. In particular, mesoporous silica, conventionally well-known silica such as MCM-41, MCM-48, and SBA-15, and other silicas with unique structures have been studied and used as substrates for a long time [ 28 , 29 , 30 , 31 ]. These conventional silicas usually show outstanding surface area and highly ordered pores but a low pore volume.…”