Amine-Impregnated Mesoporous Silica Nanotube as an Emerging Nanocomposite for CO₂ Capture

Abstract

Pristine halloysite nanotubes (HNTs) were pretreated to produce mesoporous silica nanotubes (MSiNTs), which was further impregnated with polyethenimine (PEI) to prepare an emerging nanocomposite MSiNTs/PEI (MP) for CO2 capture. Thermogravimetric analysis (TGA) was employed to analyze the influences of PEI loading amount and adsorption temperature on CO2 adsorption capacity of the nanocomposite. The Brunauer-Emmett-Teller (BET) surface area (SBET) of MSiNTs was six times higher than that of HNTs, and the corresponding pore volume was more than two times higher than that of HNTs. The well dispersion of PEI within the nanotubes of MSiNTs benefits more CO2 gas adsorption, and the adsorption capacity of the nanocomposite could reach 2.75 mmol/g at 85 °C for 2 h. The CO2 adsorption on the nanocomposite was demonstrated to occur via a two-stage process: initially, a sharp linear weight increase at the beginning, and then a relatively slow adsorption step. The adsorption capacity could reach as high as 70% within 2 min. Also, the nanocomposite exhibited good stability on CO2 adsorption/desorption performance, indicating that the as-prepared emerging nanocomposite show an interesting application potential in the field of CO2 capture.

Mineralogy and Physico-Chemical Data of Two Newly Discovered Halloysite in China and Their Contrasts with Some Typical Minerals

“…Significant attention has been focused on the application of halloysite into many fields in these years, such as the applications in chemically blocked and controlled release [16][17][18][19][20][21], biomimetic nanoreactors [22][23][24], medicine carrier and biological antibacterial materials [25][26][27], catalysis supports [28][29][30][31][32], hydrogen storage matrix [33][34][35], food packaging applications [36], mineral templates and other functional materials [37][38][39]. Many reviews have summarized the characters and application fields of Hal minerals [40,41], for example, Yuan et al [42] introduced the main structural features and properties of halloysite, especially focused on the structure and morphology of halloysite and its changes, the formation mechanism of tubular structures, the physico-chemical properties, chemical modification of surfaces, and halloysite-based advanced materials.…”

Structure and Electronic Properties of Transition Metal Doped Kaolinite Nanoclay

“…2). Such modification of structure and electronic properties by TM doping might improve the application of kaolin in the field of catalysis [50, 51], CO capture [52, 53], drug loading [54], and energy storage [55–57]. And, it can also be applied to other minerals, such as montmorillonite [50, 58], perlite [55], and talc [59] to alter their electronic properties.…”

One‐pot synthesis of high N‐doped porous carbons derived from a N‐rich oil palm biomass residue in low temperature for CO 2 capture

“…Global warming will change precipitation patterns, leading to an increase in the number and intensity of natural debt disasters, such as floods, droughts, hurricanes, large‐scale melting of snow and ice, and sea‐level rise, which will directly or indirectly threaten human life and the earth's ecosystem . The continuous accumulation of the global warming is mainly due to the large amount of greenhouse gas discharge caused through the burning of fossil energy .…”

“…Therefore, new ways to reduce CO 2 should be studied. As a hopeful and useful method to reduce CO 2 discharge, carbon capture and storage (CCS) is considered a potential alternative and has been widely explored …”