Carbon dioxide adsorption on nanomaterials

Abstract

In this study, CO 2 adsorption in the presence and absence of co-adsorbed H 2 O was investigated on different nanomaterials including nanocrystalline NaY zeolite (nano NaY), ZnO, MgO and γ-Al 2 O 3 nanoparticles as well as mixed phase aluminum nanowhiskers. In the case of nano NaY, FTIR spectra show that a majority of CO 2 adsorbs in the pores of these zeolites in a linear complex with the exchangeable cation. Most interesting is the formation of carbonate and bicarbonate on the external surface of nano NaY zeolites, suggesting unique sites for CO 2 adsorption on the surface of these small nanomaterials. Adsorption of 18 O-labeled carbon dioxide and theoretical quantum chemical calculations confirms the assignment of these different species. For aluminum oxyhydroxide nanowhiskers and gamma alumina in the absence of co-adsorbed water, CO 2 reacts with surface hydroxyl groups to yield adsorbed bicarbonate as well as some carbonate. C 18 O 2 adsorption confirms these assignments. In the case of nanoparticulate ZnO, CO 2 adsorption under dry conditions results in formation of carbonate, bicarbonates as well as carboxylates. However, in the presence of co-adsorbed water, only carbonate species is formed. 18 O-labeled carbon dioxide adsorption and theoretical quantum chemical calculations confirm the vibrational assignment for these different species. Mixed isotope studies with H 2 16 O + C 18 O 2 and H 2 18 O + C 16 O 2 suggest that there is extensive exchange between oxygen in adsorbed water and oxygen atoms in gas-phase carbon dioxide. CO 2 adsorption on MgO surfaces, under dry conditions results in formation of carbonate and bicarbonates. Implications for the use of these nanomaterials in carbon dioxide uptake and storage are discussed. vi

Assessment of impact of α‐Fe2O3 and γ‐Fe2O3 nanoparticles on phytoplankton species Selenastrum capricornutum and Nannochloropsis oculata

“…Small peaks at 2923.6 and 2854.1 cm −1 , respectively, were due to carbon dioxide. The absorption bands from 1440.5 to 1438.6 cm −1 are also related to CO 2 from carbonate and the other at 1384.6 cm −1 for both spectra to CO 2 from bicarbonate …”

Zinc Oxide Nanocrystals Grown on Cellulose Acetate Butyrate Nanofiber Mats and Their Potential Photocatalytic Activity for Dye Degradation

“…31 Similar characteristics were observed on FTIR spectrum of CAB composite obtained by 25 dipping cycles, but with lower intensity of ZnO vibration peak at 460 cm -1 (Fig. 4,b).…”

Synthesis of a PEBAX-1074/ZnO nanocomposite membrane with improved CO 2 separation performance

“…Besides, its low price and high surface-to-volume ratio compared to the other nanoparticles make it as a suitable alternative to the other nonporous fillers [26] . Moreover, the investigations showed that ZnO nanoparticles are of high potential for adsorption of CO 2 because of its intrinsic affinity [27][28][29][30] . Therefore, the use of ZnO nanoparticles as fillers in polymeric membranes can be a good choice for membrane modification.…”