Halloysite Nanotubes Capturing Isotope Selective Atmospheric CO2

Abstract

With the aim to capture and subsequent selective trapping of CO2, a nanocomposite has been developed through selective modification of the outer surface of the halloysite nanotubes (HNTs) with an organosilane to make the nanocomposite a novel solid-phase adsorbent to adsorb CO2 from the atmosphere at standard ambient temperature and pressure. The preferential adsorption of three major abundant isotopes of CO2 (12C16O2, 13C16O2, and 12C16O18O) from the ambient air by amine functionalized HNTs has been explored using an optical cavity-enhanced integrated cavity output spectroscopy. CO2 adsorption/desorption cycling measurements demonstrate that the adsorbent can be regenerated at relatively low temperature and thus, recycled repeatedly to capture atmospheric CO2. The amine grafted halloysite shows excellent stability even in oxidative environments and has high efficacy of CO2 capture, introducing a new route to the adsorption of isotope selective atmospheric CO2.

Surface‐modified halloysite nanotubes reinforced poly(lactic acid) for use in biodegradable coronary stents

“…The peaks at 1119 and 1000 cm −1 were because of SiO stretching, and the peaks at 906 cm −1 was attributed to AlOH groups . However, when HNTs was treated with ASP, apart from the peaks mentioned new peaks appeared, such as OH stretching at 3186 cm −1 , CH stretching at 2980 cm −1 due to propyl chain of added ASP, NH deformation at 1630 and 1553 cm −1 signifying the grafting of ASP over the surface of HNTs, and deformation CH bend at 1296 cm −1 . Moreover, the perpendicular SiO stretching at 1119 cm −1 was widened, and the intensity of SiO bonding at 790 and 750 cm −1 increased, shown in Figure (a).…”

“…The grafting of ASP onto HNTs is illustrated in Figure , ASP was joined to the surface hydroxyl groups of HNTs . First, 300 mL chloroform and 150 mL methanol was mixed to form 450 mL solvent solution in a fume hood, and 30 mL ASP was added to this solution.…”

Modelling CO 2 adsorption and separation on experimentally-realized B 40 fullerene

“…The criteria for an ideal CO 2 sorbent are high capacity, high selectivity, fast adsorption/desorption kinetics, good mechanical properties, high hydrothermal and chemical stability, as well as low cost of synthesis [13]. Solid sorbents have shown many potential advantages, including fast adsorption kinetics and low regeneration energy compared to amine-based CO 2 capture [11,14]. Among the solid sorbent studies, nanotubes [15] and metal-organic frameworks [7] have been found to be excellent solid CO 2 sorbents at a low cost.…”

“…Apart from reducing CO 2 emission from human activities, carbon capture and storage (CCS) [4,5], or post combustion capture (PCC), is an alternative way to reduce the CO 2 concentration in the atmosphere and alleviate global warming [6][7][8]. As the key step of CCS, capture and separation of CO 2 has spurred much research interest in experiment and theoretical modelling [9][10][11][12]. The criteria for an ideal CO 2 sorbent are high capacity, high selectivity, fast adsorption/desorption kinetics, good mechanical properties, high hydrothermal and chemical stability, as well as low cost of synthesis [13].…”

Solid Amine Adsorbent Prepared by Molecular Imprinting and Its Carbon Dioxide Adsorption Properties

“…[2,3] Solid adsorbentsh ave been extensively investigated to develop possible alternatives to amine solvents for CO 2 capture. [4][5][6][7] Numerous microporous materials were reported to present superior physical or chemical adsorption of CO 2 , [8][9][10] but mosto ft hem suffered from ar eduction of CO 2 adsorption capacityo rs tructure decomposition caused by coadsorbed H 2 Ow hen exposed to humid flue gases and air. [11,12] Amine speciess upported on various solids,s uch as silica, are examples of solid amine adsorbents that have high adsorption capacitiesa nd desirables electivity toward CO 2 over N 2 .…”