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Recyclable carbon nanotube/silicone oil emulsion with NaOH aqueous solution for indoor CO2 capture.
- Source :
- Green Chemistry; 8/21/2022, Vol. 24 Issue 16, p6264-6277, 14p
- Publication Year :
- 2022
-
Abstract
- Emulsion solvents (ES), which are liquid absorbent-based CO<subscript>2</subscript> capture materials, are developed as simple and expandable droplets to control CO<subscript>2</subscript> capture performance. An aqueous NaOH solution, which is a chemical absorbent, is encapsulated by functionalized carbon nanotubes (CNTs) to form a solid adsorbent by enhancing the high lipophilicity and high-viscosity silicone oil. The ratio of each component controls the CO<subscript>2</subscript> capture performance of the solvent. It is shown that droplets of NaOH aqueous solution formed in fine sizes improve the efficiency of the chemical reaction capacity of NaOH and CO<subscript>2</subscript>, and thus, even when crystallization occurs, they can be used in a stationary environment, and NaOH can be used at a high concentration. It is found that the optimum concentration of CNTs required to minimize the size of the emulsion is 0.075 wt%, while the CO<subscript>2</subscript> capture capacity is 2.23 mmol<subscript>CO<subscript>2</subscript></subscript> g<superscript>−1</superscript><subscript>ES–NaOH</subscript> at a pure CO<subscript>2</subscript> concentration and 1.31 mmol<subscript>CO<subscript>2</subscript></subscript> g<superscript>−1</superscript><subscript>ES–NaOH</subscript> at a low CO<subscript>2</subscript> concentration (2000 ppm, 50% relative humidity). The oil phase can be recycled continuously by separating the crystallized aqueous phase after the CO<subscript>2</subscript> capture. These results demonstrate that chemical absorbents with excellent CO<subscript>2</subscript> capture performance can be used safely and for a long time in order to reduce indoor CO<subscript>2</subscript>, and the CO<subscript>2</subscript> capture performance can be flexibly controlled. [ABSTRACT FROM AUTHOR]
- Subjects :
- AQUEOUS solutions
CHEMICAL reactions
CARBON nanotubes
SILICONES
HUMIDITY
EMULSIONS
Subjects
Details
- Language :
- English
- ISSN :
- 14639262
- Volume :
- 24
- Issue :
- 16
- Database :
- Complementary Index
- Journal :
- Green Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 158548922
- Full Text :
- https://doi.org/10.1039/d2gc01786e