New Insights into CO2 Adsorption on Layered Double Hydroxide (LDH)-Based Nanomaterials

Abstract

The interlamellar spacing of layered double hydroxides (LDHs) was enlarged by dodecyl sulfonate ions firstly, and then, (3-aminopropyl)triethoxysilane (APS) was chemically grafted (APS/LDHs). The structural characteristics and thermal stability of these prepared samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), reflectance Fourier transform infrared spectrometer (FTIR), thermogravimetric analysis (TG), and elemental analysis (EA) respectively. The CO2 adsorption performance was investigated adopting TG and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The results presented that the CO2 adsorption capacity on APS/LDHs was as high as 90 mg/g and showed no obvious reduction during a five cyclic adsorption-desorption test, indicating its superior performance stability. The DRIFTS results showed that both carbamates and weakly bounded CO2 species were generated on APS/LDHs. The weakly adsorbed species was due to the different local chemical environment for CO2 capture provided by the surface moieties of LDHs like free silanol and hydrogen bonds.

Dielectric and Infrared Spectroscopy Characterization of Co–Al Layered Double Hydroxides

“…[ 2 ] There are also indications that some gas species can be captured by the anions in the galleries. [ 28 ]…”

Layered double hydroxides and their composites as high-performance photocatalysts for CO2 reduction

“…Then, a novel approach where a monolayer of terminal amino groups of APS is grafted onto LDHs (APS/LDHs) for CO 2 capture was explored by Tang et al 70 It was found that the enlarged layer spacing pillared by dodecyl sulfonate is beneficial to APS introduction. APS is tethered to the LDH laminates through covalent interaction.…”

Engineering Layered Double Hydroxide–Based Photocatalysts Toward Artificial Photosynthesis: State‐of‐the‐Art Progress and Prospects

“…[ 185 ] LDHs are a promising layered material in the field of photocatalytic CO 2 RR emerged from their high adsorption capacity (0.5–1.4 mmol g sorbent −1 ), [ 186 ] which is attributed to the abundance of OH − groups [25a,187] that function to facilitate the reduction of CO 2 on the active sites. [ 188 ] Table 8 presents a summary of 2D LDH compounds studied in the field of light‐driven CO 2 RR.…”