CAS OpenIR
Transformation of Gibbsite to Boehmite in Caustic Aqueous Solution at Hydrothermal Conditions
Zhang, Xin1; Cui, Wenwen1,2,3; Hu, Jian Zhi1; Wang, Hsiu-Wen4; Prange, Micah P.1; Wan, Chuan1; Jaegers, Nicholas R.1; Zong, Meirong1,5; Zhang, Hailin1,2,3; Pearce, Carolyn, I1; Li, Ping2; Wang, Zheming1; Clark, Sue B.1,6; Rosso, Kevin M.1
2019-10-01
Source PublicationCRYSTAL GROWTH & DESIGN
ISSN1528-7483
Volume19Issue:10Pages:5557-5567
AbstractPhase transformations among aluminum (oxyhydr)oxide minerals play important roles across a wide range of natural and industrial settings. In highly caustic aqueous solutions, uncertainty persists regarding whether solid-state or dissolution-reprecipitation pathways dominate. We explored the transformation of gibbsite [alpha-Al(OH)(3)] to boehmite (gamma-AlOOH) in caustic NaOH solution at hydrothermal conditions as a function of temperature, Al(III) and NaOH concentrations, and reaction time. Comparison of detailed structural and morphological solids characterization by X-ray diffraction, scanning electron microscopy/transmission electron microscopy, atomic force microscopy, Raman spectroscopy, and high-field Al-27 MAS NMR to predictions from equilibrium thermodynamics calculations suggests the critical importance of dissolution-reprecipitation across our range of system conditions. The yield and physical properties of the boehmite product were found to be sensitive to the hydrothermal treatment temperature and the Al/OH- ratio, controlled by the loading of gibbsite with respect to NaOH. Experiments at lower Al/OH- ratios (e.g., 0.64) indicate that the dissolution of the gibbsite reaches an aqueous aluminate saturation state sufficient to overcome the nucleation barrier for boehmite. Higher Al/OH- ratios (e.g., 3.2) are found to slow the phase transformation, leaving residual unreacted gibbsite in the final product. Higher temperatures appear to improve the phase transformation rate but also typically yield smaller-sized boehmite particles. Particle morphological analyses compared to thermodynamic expectations suggest an important role of kinetics at mineral/solution interfaces, both in the gibbsite dissolution rate as well as the growth rate of boehmite nanocrystals.
DOI10.1021/acs.cgd.9b00468
Language英语
WOS KeywordHIGH-TEMPERATURE SOLUBILITY ; IONIC-STRENGTH ; ALUMINATE SOLUTIONS ; GAMMA-ALUMINA ; GROWTH ; PRECIPITATION ; TRANSITIONS ; PARTICLES ; STABILITY ; BAYERITE
Funding ProjectIDREAM (Interfacial Dynamics in Radiation Environments and Materials), an Energy Frontier Research Center - U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES) ; DOE Office of Biological and Environmental Research ; DOE[DE-AC05-76RL01830]
WOS Research AreaChemistry ; Crystallography ; Materials Science
WOS SubjectChemistry, Multidisciplinary ; Crystallography ; Materials Science, Multidisciplinary
Funding OrganizationIDREAM (Interfacial Dynamics in Radiation Environments and Materials), an Energy Frontier Research Center - U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES) ; DOE Office of Biological and Environmental Research ; DOE
WOS IDWOS:000489001700016
PublisherAMER CHEMICAL SOC
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/31116
Corresponding AuthorZhang, Xin; Rosso, Kevin M.
Affiliation1.Pacific Northwest Natl Lab, Richland, WA 99352 USA
2.Chinese Acad Sci, Inst Proc Engn, Beijing, Peoples R China
3.Univ Chinese Acad Sci, Beijing, Peoples R China
4.Oak Ridge Natl Lab, Oak Ridge, TN 37830 USA
5.Nanjing Univ, Sch Earth Sci & Engn, Nanjing, Jiangsu, Peoples R China
6.Washington State Univ, Dept Chem, Pullman, WA 99164 USA
Recommended Citation
GB/T 7714
Zhang, Xin,Cui, Wenwen,Hu, Jian Zhi,et al. Transformation of Gibbsite to Boehmite in Caustic Aqueous Solution at Hydrothermal Conditions[J]. CRYSTAL GROWTH & DESIGN,2019,19(10):5557-5567.
APA Zhang, Xin.,Cui, Wenwen.,Hu, Jian Zhi.,Wang, Hsiu-Wen.,Prange, Micah P..,...&Rosso, Kevin M..(2019).Transformation of Gibbsite to Boehmite in Caustic Aqueous Solution at Hydrothermal Conditions.CRYSTAL GROWTH & DESIGN,19(10),5557-5567.
MLA Zhang, Xin,et al."Transformation of Gibbsite to Boehmite in Caustic Aqueous Solution at Hydrothermal Conditions".CRYSTAL GROWTH & DESIGN 19.10(2019):5557-5567.
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