CO₂ Adsorption Enhanced by Tuning the Layer Charge in a Clay Mineral.

ABSTRACT: Due to the compact two-dimensional interlayer pore space and the high density of interlayer molecular adsorption sites, clay minerals are competitive adsorption materials for carbon dioxide capture. We demonstrate that with a decreasing interlayer surface charge in a clay mineral, the adsorption capacity for CO₂ increases, while the pressure threshold for adsorption and swelling in response to CO₂ decreases. Synthetic nickel-exchanged fluorohectorite was investigated with three different layer charges varying from 0.3 to 0.7 per formula unit of Si₄O₁₀F₂. We associate the mechanism for the higher CO₂ adsorption with more accessible space and adsorption sites for CO₂ within the interlayers. The low onset pressure fo

SUBMITTER: Bo Hunvik KW 

PROVIDER: S-EPMC8675214 | biostudies-literature | 2021 Dec

REPOSITORIES: biostudies-literature