Nanostructured polyethylenimine decorated palygorskite for reversible CO₂ capture

Radiation-initiated high strength chitosan/lithium sulfonate double network hydrogel/aerogel with porosity and stability for efficient CO2 capture

“… 12 However, the physical adsorbents require large pressure of CO 2 and exhibit relatively low selectivity toward CO 2 in the presence of other gases. 13 Theoretically, increasing the isosteric heat of CO 2 adsorption via the introduction of CO 2 -philic groups should have a great effect on the capture capacity and selectivity. 14 However, the conventional methods of grafting and impregnation to introduce CO 2 -philic groups usually has negative influences on surface area and may result in a decrease in CO 2 absorption capacity.…”

Monoethanolamine-Modified Attapulgite-Based Amorphous Silica for the Selective Adsorption of CO2 from Simulated Biogas

“…21 The band at 1642 cm −1 is responsible for the bending vibrations of H 2 O in the a-SiO 2 structure. 36 According to Boudriche et al's report, 43 the bands at 3614 and 3546 cm −1 corresponding to the stretching vibrations of the structural −OH group disappeared for the 5 M HCl-activated attapulgite, which confirmed the total dissolution of the octahedral sheets by high concentrations of acid activation. As a result, a weak broad band at 3436 cm −1 appeared on the spectra of ATPbased a-SiO 2 .…”

“…37 Two weak bands at 1462 and 1569 cm −1 are caused by the NH stretching vibration and NH 2 scissoring vibration. 36,51 The weak band at 1386 cm −1 corresponds to the stretching vibrations of C− N. 37,52 Meanwhile, with the increase in MEA loading, the bands for these specific functional groups for MEA became larger, which further indicated that more MEA compounds were dispersed inside the pores and/or on the surface of a-SiO 2 . 37 As shown in Table 1, the successful loading of MEA could be further confirmed by the increasing CHN content and actual MEA loading.…”

“…For these amine-modified clay sorbents, the CO 2 adsorption capacity of 0.66−3.39 mmol/g was achieved for pure CO 2 . [36][37][38]52,65 Kaolinites, containing tetrahedral silicate and octahedral hydroxide sheets in the crystal structure, showed an outstanding application prospect for CO 2 capture with amine modification. 35,37 Another group of carriers, such as SBA-15, 66,67 MCM-41, 24,68 and silica gel, 61 was synthesized to load different amines for CO 2 adsorption.…”

“…Recently, clay mineral is extensively applied to CO 2 capture and adsorption due to its abundant supply, low cost, and high mechanical and chemical stability. 35 Ma et al 36 immobilized polyethylenimine (PEI) onto palygorskite for CO 2 capture at 25 °C under 0.1 MPa, which showed a CO 2 adsorption capacity of 0.89 mmol/g at a PEI loading of 25 wt %. Chen and Lu 37 prepared monoethanolamine (MEA)-and ethylenediamine (EDA)-modified kaolinite 39 Attapulgite (ATP, also named as palygorskite-PAL) is one kind of natural clay mineral that is made of magnesium aluminum phyllosilicate ((MgAl) 2 Si 4 O 10 •4H 2 O).…”