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Title: Radiolytic stability of gibbsite and boehmite with adsorbed water

Abstract

Aluminum oxyhydroxide (boehmite, AlOOH) and aluminum hydroxide (gibbsite, Al(OH)3) powders with adsorbed water were irradiated with -rays and 5 MeV He ions (α-particles) in order to determine overall radiation stability and chemical modification to the surface. No variation in overall phase or crystallinity due to radiolysis was observed with X-ray diffraction (XRD) and Raman spectroscopy for doses up to 2 MGy with -rays and 175 MGy with α-particles. Temperature programed desorption (TPD) of the water from the surface to the gas phase indicated that the water was chemisorbed and strongly bound. Water adsorption sites are of similar energy for both gibbsite and boehmite. Observation of the water adsorbed on the surface of gibbsite and boehmite with diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) showed broad peaks at 3100-3600 cm-1 due to OH stretching that slowly decreased on heating to 500oC, which corresponds well with the water vapor evolution observed with TPD. Both materials were found to be amorphous following heating to 500oC. X-ray photoelectron spectroscopy (XPS) indicated surface reduction of Al(III) to Al metal on radiolysis with α-particles. Complete loss of chemisorbed water and the formation of bulk O atoms was observed following radiolysis with α-particles.

Authors:
; ORCiD logo; ; ORCiD logo; ;
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL); Energy Frontier Research Centers (EFRC) (United States). Interfacial Dynamics in Radioactive Environments and Materials (IDREAM)
Sponsoring Org.:
USDOE
OSTI Identifier:
1421327
Report Number(s):
PNNL-SA-131809
Journal ID: ISSN 0022-3115; 49771; KC0307010
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 501; Journal Issue: C; Journal ID: ISSN 0022-3115
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
Gibbsite; Boehmite; Aluminum hydroxide; Hanford; Aluminum oxyhydroxide; Environmental Molecular Sciences Laboratory

Citation Formats

Huestis, Patricia, Pearce, Carolyn I., Zhang, X., N'Diaye, Alpha T., Rosso, Kevin M., and LaVerne, Jay A. Radiolytic stability of gibbsite and boehmite with adsorbed water. United States: N. p., 2018. Web. doi:10.1016/j.jnucmat.2018.01.043.
Huestis, Patricia, Pearce, Carolyn I., Zhang, X., N'Diaye, Alpha T., Rosso, Kevin M., & LaVerne, Jay A. Radiolytic stability of gibbsite and boehmite with adsorbed water. United States. doi:10.1016/j.jnucmat.2018.01.043.
Huestis, Patricia, Pearce, Carolyn I., Zhang, X., N'Diaye, Alpha T., Rosso, Kevin M., and LaVerne, Jay A. Sun . "Radiolytic stability of gibbsite and boehmite with adsorbed water". United States. doi:10.1016/j.jnucmat.2018.01.043.
@article{osti_1421327,
title = {Radiolytic stability of gibbsite and boehmite with adsorbed water},
author = {Huestis, Patricia and Pearce, Carolyn I. and Zhang, X. and N'Diaye, Alpha T. and Rosso, Kevin M. and LaVerne, Jay A.},
abstractNote = {Aluminum oxyhydroxide (boehmite, AlOOH) and aluminum hydroxide (gibbsite, Al(OH)3) powders with adsorbed water were irradiated with -rays and 5 MeV He ions (α-particles) in order to determine overall radiation stability and chemical modification to the surface. No variation in overall phase or crystallinity due to radiolysis was observed with X-ray diffraction (XRD) and Raman spectroscopy for doses up to 2 MGy with -rays and 175 MGy with α-particles. Temperature programed desorption (TPD) of the water from the surface to the gas phase indicated that the water was chemisorbed and strongly bound. Water adsorption sites are of similar energy for both gibbsite and boehmite. Observation of the water adsorbed on the surface of gibbsite and boehmite with diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) showed broad peaks at 3100-3600 cm-1 due to OH stretching that slowly decreased on heating to 500oC, which corresponds well with the water vapor evolution observed with TPD. Both materials were found to be amorphous following heating to 500oC. X-ray photoelectron spectroscopy (XPS) indicated surface reduction of Al(III) to Al metal on radiolysis with α-particles. Complete loss of chemisorbed water and the formation of bulk O atoms was observed following radiolysis with α-particles.},
doi = {10.1016/j.jnucmat.2018.01.043},
journal = {Journal of Nuclear Materials},
issn = {0022-3115},
number = C,
volume = 501,
place = {United States},
year = {2018},
month = {4}
}