Microscopic Examination of Nanosized Mixed Ni−Al Hydroxide Surface Precipitates on Pyrophyllite
Abstract
The nature of Ni-hydroxide precipitates on pyrophyllite were reexamined by analytical electron microscopy (AEM), high-resolution transmission electron microscopy (HRTEM), selected-area electron diffraction (SAED), powder X-ray diffraction (PXRD), and extended X-ray absorption fine structure (EXAFS) spectroscopy. Chemical analysis of precipitates showed that the precipitate contains about 20% Al. HRTEM imaging showed that the precipitate was amorphous and PXRD failed to find any crystalline peaks associated with cnrystalline Ni-Al layered double-hydroxide (LDH) or alpha-Ni(OH)2. These results confirmed the conclusion from EXAFS spectroscopic data that Al coprecipitated with Ni on Al-rich substrates to form Ni-Al LDH surface precipitates. However, the HRTEM data clarifies that although the bonding environment of the precipitate is like that of Ni-AI LDH, no long-range ordering of the structure exists. The study illustrates the need for TEM observations to complement EXAFS data and the potential importance of amorphous materials in environmental settings.
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As reported by Sparks and coworkers, sorption of select heavy metals (Co, Ni, Zn) on soil minerals involves a continuum of processes from adsorption to precipitation to solid phase transformation.
“As reported by Sparks and coworkers [1, 3, 7, 8, 25], sorption of select heavy metals (Co, Ni, Zn) on soil minerals involves a continuum of processes from adsorption to precipitation to solid phase transformation.”
From Chemical Processes Affecting the Mobility of Heavy Metals and Metalloids in Soil Environments (2016) · cites this paper as [25]
As the amount of cations or anions sorbed onto the surfaces of a mineral increases (surface coverage), the sorption changes from mononuclear adsorption to surface precipitation (a three-dimensional phase).
“As the amount of cations or anions sorbed onto the surfaces of a mineral increases (surface coverage), the sorption changes from mononuclear adsorption to surface precipitation (a threedimensional phase) [3, 8, 25].”
From Chemical Processes Affecting the Mobility of Heavy Metals and Metalloids in Soil Environments (2016) · cites this paper as [25]
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- Authors
- Livi, K. J. T., Senesi, G. S., Scheinost, A. C., & Sparks, D. L.
- Affiliations
- Johns Hopkins University (US)
- Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, Maryland 21218, Department of Plant and Soil Sciences and Center for Critical Zone Research, University of Delaware, Newark, Delaware 19717-1303, CNR-IMIP Instituto di Metodologie Inorganiche e dei Plasmi, Via Amendola, 122/D - 70126 bari, Italy, Molecular Structures Group, Institute of Radiochemistry, FZD, Dresden, Germany, and Rossendorf Beamline at ESRF, 38043 Grenoble, France
- Corresponding author
- Livi, Kenneth J. T.
- Venue
- Environmental Science & Technology
- Publisher
- American Chemical Society (ACS)
- Published
- 2009-01-12
- Volume
- 43
- Issue
- 5
- Pages
- 1299-1304
- ISSN
- 0013-936X (ISSN-L)
- 1520-5851
- OpenAlex
- W2100682480
- Cited by
- 34
- References
- 27
- Citations by year
- 2025: 1 · 2023: 4 · 2022: 3 · 2021: 1 · 2018: 1 · 2017: 3 · 2016: 3 · 2015: 2 · 2014: 1 · 2013: 3 · 2012: 6
- FWCI
- 1.93
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Environmental Science & Technology (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Science Foundation
- W. M. Keck Foundation
- Johns Hopkins University
- Topics
- Physical Sciences › Materials Science › Materials Chemistry › Layered Double Hydroxides Synthesis and Applications
- Physical Sciences › Environmental Science › Water Science and Technology › Environmental and Analytical Chemistry Studies
- Physical Sciences › Environmental Science › Pollution › Heavy metals in environment
- Keywords
- NiAl layered double hydroxide, surface precipitates, pyrophyllite, amorphous precipitates, nickel hydroxide, EXAFS, high-resolution transmission electron microscopy, long-range order, nanosized precipitates
- MeSH terms
- Aluminum, Aluminum Silicates, Hydroxides, Nickel, Particle Size, Chemical Precipitation, Spectrum Analysis, Surface Properties, X-Ray Diffraction, Microscopy, Electron, Transmission, Nanostructures
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