Instantaneous Ex Situ Mineral Carbonation Relevant to Alkali Metals in Clay Nanoparticles

Abstract

Carbon recycling reusing emitted carbon dioxide (CO 2 ) as raw materials is nowadays recognized as a concept ahead of CO 2 capture and storage for controlling its emission to the air. Here, recently discovered alkali-metal-based instantaneous ex situ mineral carbonation under ambient conditions is studied for saponite clay nanoparticles. The cationic concentration of Cs + is varied for seeking the possibility of reusing Cs-contaminated soil in view of carbon recycling. The ex situ mineral carbonation dominantly occurring at the interior surfaces of 10 Å open spaces formed by overlapped nanosheets increases with increasing the Cs concentration up to 0.580 mmol g −1 due to the enlargement of the surface area. The ability of the ex situ mineral carbonation, however, deteriorates with further increasing to 0.585 mmol g −1 since the 10 Å open spaces are effectively occupied by Cs compounds as Cs 2 O reducing their fraction. The present findings of the ex situ mineral carbonation relevant to the cationic concentration imply that the practical soil associated with a Fukushima nuclear accident can stabilize CO 2 without energy consumption as well as chemical solution.

The Journal of Physical Chemistry C Virtual Special Issue on Advanced Characterization by Solid-State NMR and In Situ Technology and in Recognition of Michael Hunger’s 65th Birthday

“…The Hermans group characterized silica-supported boron by double quantum–single quantum (DQ-SQ), HETCOR, refocused insensitive nuclei enhanced by polarization transfer (RINEPT), heteronuclear multiple-quantum correlation (HMQC) NMR to understand the surface sites and their structures for oxidative dehydrogenation . Solid-state NMR was used by the Sato group to characterize Cs-containing clay nanoparticles for carbon dioxide capture and storage . Mafra and coworkers combined Multi-CP 13 C NMR and 13 C T 1 measurements to separate various absorbed CO 2 species and detect “hidden” physisorbed CO 2 species in amine-modified porous silicas .…”

“…8 Solid-state NMR was used by the Sato group to characterize Cs-containing clay nanoparticles for carbon dioxide capture and storage. 9 Mafra and coworkers combined Multi-CP 13 C NMR and 13 C T 1 measurements to separate various absorbed CO 2 species and detect "hidden" physisorbed CO 2 species in amine-modified porous silicas. 10 Estes and coworkers probed the interactions of immobilized Ru complexes with metal oxide supports by 31 P{ 1 H}HETCOR for CO 2 hydrogenation.…”