Transitions in Al Coordination during Gibbsite Crystallization Using High-Field 27 Al and 23 Na MAS NMR Spectroscopy

Hu, Jian Zhi; Zhang, Xin; Jaegers, Nicholas R.; Wan, Chuan; Graham, Trent R.; Hu, Mary; Pearce, Carolyn I.; Felmy, Andrew R.; Clark, Sue B.; Rosso, Kevin M.

doi:10.1021/acs.jpcc.7b10424

Title: Transitions in Al Coordination during Gibbsite Crystallization Using High-Field ²⁷ Al and ²³ Na MAS NMR Spectroscopy

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Abstract

Mechanisms of nucleation and growth of Al hydroxides such as gibbsite from aqueous solution, particularly in highly alkaline conditions, remain poorly understood. In this work, quantitative 27Al and 22Na MAS NMR experiments were conducted on solid samples extracted from the crystallization of gibbsite from an amorphous aluminum hydroxide gel precursor. The use of high magnetic field and fast sample spinning allowed transitional tetrahedral (AlT) and pentahedral (AlP) aluminum species to be observed along with the octahedral aluminum (AlO) that dominates the gibbsite product. Low-coordinated Al species could be detected at concentrations as low as 0.1% of the total Al sites. It is established that (a) AlT and AlP coexist on the surface of growing gibbsites even with a combined percentage over the total Al sites of less than 1%; (b) Different synthesis methods generate gibbsite with varying amounts of low-coordinated Al; (c) the amorphous gel precursor contains a significant amount of low-coordinated Al sites with AO: AlP: AlT ratios of approximately 4:2:1; (d) upon hydration, the external, low-coordinated Al sites become six-fold coordinated by interacting with the oxygen in H2O and the 27Al MAS NMR peak position shifts to that for the AlO sites; (e) gibbsite with increased long rangemore »« less

Authors:

^[1]; Zhang, Xin ^[1];

^[2];

^[1]; Graham, Trent R. ^[2]; Hu, Mary ^[1]; Pearce, Carolyn I. ^[1]; Felmy, Andrew R. ^[2]; Clark, Sue B. ^[2];

^[1]

Pacific Northwest National Laboratory, Richland, Washington 99354, United States
Pacific Northwest National Laboratory, Richland, Washington 99354, United States; Washington State University, Pullman, Washington 99164, United States

Publication Date:: Thu Nov 30 00:00:00 EST 2017

Research Org.:: Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL); Energy Frontier Research Centers (EFRC) (United States). Interfacial Dynamics in Radioactive Environments and Materials (IDREAM)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1422323

Report Number(s):: PNNL-SA-130259
Journal ID: ISSN 1932-7447; 49771; KC0307010

DOE Contract Number:: AC05-76RL01830

Resource Type:: Journal Article

Journal Name:: Journal of Physical Chemistry. C

Additional Journal Information:: Journal Volume: 121; Journal Issue: 49; Journal ID: ISSN 1932-7447

Publisher:: American Chemical Society

Country of Publication:: United States

Language:: English

Subject:: Environmental Molecular Sciences Laboratory

Citation Formats


                    Hu, Jian Zhi, Zhang, Xin, Jaegers, Nicholas R., Wan, Chuan, Graham, Trent R., Hu, Mary, Pearce, Carolyn I., Felmy, Andrew R., Clark, Sue B., and Rosso, Kevin M. Transitions in Al Coordination during Gibbsite Crystallization Using High-Field 27 Al and 23 Na MAS NMR Spectroscopy.  United States: N. p., 2017. 
        Web.  doi:10.1021/acs.jpcc.7b10424.

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                    Hu, Jian Zhi, Zhang, Xin, Jaegers, Nicholas R., Wan, Chuan, Graham, Trent R., Hu, Mary, Pearce, Carolyn I., Felmy, Andrew R., Clark, Sue B., & Rosso, Kevin M. Transitions in Al Coordination during Gibbsite Crystallization Using High-Field 27 Al and 23 Na MAS NMR Spectroscopy.  United States.  https://doi.org/10.1021/acs.jpcc.7b10424

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                    Hu, Jian Zhi, Zhang, Xin, Jaegers, Nicholas R., Wan, Chuan, Graham, Trent R., Hu, Mary, Pearce, Carolyn I., Felmy, Andrew R., Clark, Sue B., and Rosso, Kevin M. 2017.  
        "Transitions in Al Coordination during Gibbsite Crystallization Using High-Field 27 Al and 23 Na MAS NMR Spectroscopy".  United States.  https://doi.org/10.1021/acs.jpcc.7b10424.

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@article{osti_1422323,

  title        = {Transitions in Al Coordination during Gibbsite Crystallization Using High-Field 27 Al and 23 Na MAS NMR Spectroscopy},

  author       = {Hu, Jian Zhi and Zhang, Xin and Jaegers, Nicholas R. and Wan, Chuan and Graham, Trent R. and Hu, Mary and Pearce, Carolyn I. and Felmy, Andrew R. and Clark, Sue B. and Rosso, Kevin M.},

  abstractNote = {Mechanisms of nucleation and growth of Al hydroxides such as gibbsite from aqueous solution, particularly in highly alkaline conditions, remain poorly understood. In this work, quantitative 27Al and 22Na MAS NMR experiments were conducted on solid samples extracted from the crystallization of gibbsite from an amorphous aluminum hydroxide gel precursor. The use of high magnetic field and fast sample spinning allowed transitional tetrahedral (AlT) and pentahedral (AlP) aluminum species to be observed along with the octahedral aluminum (AlO) that dominates the gibbsite product. Low-coordinated Al species could be detected at concentrations as low as 0.1% of the total Al sites. It is established that (a) AlT and AlP coexist on the surface of growing gibbsites even with a combined percentage over the total Al sites of less than 1%; (b) Different synthesis methods generate gibbsite with varying amounts of low-coordinated Al; (c) the amorphous gel precursor contains a significant amount of low-coordinated Al sites with AO: AlP: AlT ratios of approximately 4:2:1; (d) upon hydration, the external, low-coordinated Al sites become six-fold coordinated by interacting with the oxygen in H2O and the 27Al MAS NMR peak position shifts to that for the AlO sites; (e) gibbsite with increased long range order is synthesized over longer times by gradually incorporating residual AlP and AlT sites into octahedrally-coordinated AlO sites; (f) trace Na is predominantly a surface species on gibbsite particles. These findings provide a basis for understanding the gibbsite crystallization mechanism, along with a general means of characterizing gibbsite surface properties that are of equal importance for understanding related processes such as dissolution behavior.},

  doi          = {10.1021/acs.jpcc.7b10424},

  url          = {https://www.osti.gov/biblio/1422323},
  journal      = {Journal of Physical Chemistry. C},

  issn         = {1932-7447},

  number       = 49,

  volume       = 121,

  place        = {United States},

  year         = {Thu Nov 30 00:00:00 EST 2017},

  month        = {Thu Nov 30 00:00:00 EST 2017}

}

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Title: Transitions in Al Coordination during Gibbsite Crystallization Using High-Field 27 Al and 23 Na MAS NMR Spectroscopy

Abstract

Citation Formats

Title: Transitions in Al Coordination during Gibbsite Crystallization Using High-Field ²⁷ Al and ²³ Na MAS NMR Spectroscopy