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Comparison of Mg–Al layered double hydroxides intercalated with OH− and CO32− for the removal of HCl, SO2, and NO2.
- Source :
- Journal of Porous Materials; Jun2022, Vol. 29 Issue 3, p723-728, 6p
- Publication Year :
- 2022
-
Abstract
- Two different Mg–Al layered double hydroxides (LDHs), OH⋅Mg–Al LDH and CO<subscript>3</subscript>⋅Mg–Al LDH, are prepared and utilized for the efficient removal of acidic gases. The former contains OH<superscript>−</superscript> anions intercalated between the Mg–Al layers, whereas the latter contains CO<subscript>3</subscript><superscript>2−</superscript>. The synthesized Mg–Al LDHs were characterized via X-ray diffraction (XRD) and tested for their ability to remove three important acidic gases, HCl, NO<subscript>2</subscript>, and SO<subscript>2</subscript> via chemical reaction with the intercalated OH<superscript>−</superscript> and CO<subscript>3</subscript><superscript>2−</superscript> anions (for HCl and NO<subscript>2</subscript>) and surface adsorption (in case of SO<subscript>2</subscript>). Both OH⋅Mg–Al LDH and CO<subscript>3</subscript>⋅Mg–Al LDH showed appreciable gas removal abilities with respect to HCl and NO<subscript>2</subscript>. However, in case of OH⋅Mg–Al LDH, a higher gas removal efficiency was observed due to the facile reaction between the acidic gases and the intercalated OH<superscript>−</superscript> anions between the LDH layers. Briefly, the HCl removal amount was 0.53 mmol for OH⋅Mg–Al LDH and 0.49 mmol for CO<subscript>3</subscript>⋅Mg–Al LDH in 90 min. The NO<subscript>2</subscript> removal amount was 0.09 mmol for OH⋅Mg–Al LDH and 0.07 mmol for CO<subscript>3</subscript>⋅Mg–Al LDH in 90 min. The SO<subscript>2</subscript> removal amounts by the LDHs were comparable since the gas was adsorbed on the surface of the LDHs. The SO<subscript>2</subscript> removal amount was 0.04 mmol for OH⋅Mg–Al LDH and 0.04 mmol for CO<subscript>3</subscript>⋅Mg–Al LDH in 90 min. The XRD results indicated that the LDHs retained their structures after gas removal, despite attenuation of the XRD peak intensities. Thus, two easily synthesized LDHs with efficient acidic gas removal characteristics have been developed via judicious utilization of the reactions that dictate gas removal by LDHs. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 13802224
- Volume :
- 29
- Issue :
- 3
- Database :
- Complementary Index
- Journal :
- Journal of Porous Materials
- Publication Type :
- Academic Journal
- Accession number :
- 156744344
- Full Text :
- https://doi.org/10.1007/s10934-022-01206-4