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Title: Synthesis, characterization and thermodynamic study of carbon dioxide adsorption on akaganéite

A mixture of akaganeite nanoparticles and sodium salts was synthesized and modi fied, first by washing, and then by Li exchange. The structural characterization of the produced materials was performed with: powder X-ray diffraction, scanning electron microscopy, energy dispersive X-ray analysis, thermogravimetric analysis, diffuse reflectance infrared Fourier transform spectrometry, Mossbauer spectros- € copy and magnetization measurements. Additionally low pressure nitrogen and high pressure carbon dioxide adsorption experiments were performed. The sum of the characterization information made possible to conclude that the produced akaganeite phases crystallized in a structure exhibiting the symmetry of the I2/m space group, where the measured equivalent spherical diameter of the akaganeite crystallites yielded 9 nm, as well, the tested phases exhibited a standard behaviour under heating and displayed a superparamagnetic behaviour. Finally the high pressure carbon dioxide adsorption experiments demonstrated a pressure-responsive framework opening event due to a structural transformation of the adsorbent framework induced by the guest molecules. This fact opens new applications for akaganeite as a high pressure adsorbent.
Authors:
ORCiD logo [1] ;  [1] ;  [1] ;  [1] ;  [1]
  1. Univ. of Turabo (Puerto Rico); Univ. of Puerto Rico, Mayaguez (Puerto Rico)
Publication Date:
Grant/Contract Number:
NA0000672
Type:
Accepted Manuscript
Journal Name:
Current Applied Physics
Additional Journal Information:
Journal Volume: 15; Journal Issue: 4; Journal ID: ISSN 1567-1739
Publisher:
Korean Physical Society
Research Org:
Univ. of Turabo (Puerto Rico)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
OSTI Identifier:
1336314
Alternate Identifier(s):
OSTI ID: 1251914