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- W2789748959 abstract "The facile and accurate measurement of the layer charge of dioctahedral smectite has been demonstrated recently by means of the O-D method, an infrared-based technique capable of recording the exact position of a dangling O-D (OH) bond stretch of interlayer water. The present work attempts to transfer this know-how to the near-infrared (NIR) spectra of natural bentonites in anticipation of even higher throughput capabilities. For this reason, the NIR systematics of ~ 70 bentonites in both natural and Na-exchanged form have been analyzed against the mid-infrared-derived layer charges of the same samples. The as determined layer charges were not biased by the nature of the interlayer cations (Ca2 +, Mg2 +, Na+). A linear correlation between the (ν + δ) combination modes of H2O and Al2OH at ~ 5250 and 4525 cm− 1, respectively, was established, confirmed on a broader collection of bentonite samples, and discussed in terms of interlayer and layer chemistry. The (ν + δ) H2O wavenumber was found to correlate linearly with layer charge, but the slope was dependent on interlayer cation due to the cation-dependence of the bending δ Η2Ο fundamental mode. Additionally, PLS chemometric modeling of the NIR spectra was employed successfully to provide layer charge predictive algorithms, desensitized from the effect of interlayer cation (Ca2 +, Mg2 +, Na+)." @default.
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- W2789748959 date "2018-08-01" @default.
- W2789748959 modified "2023-10-18" @default.
- W2789748959 title "Smectite in bentonite: Near infrared systematics and estimation of layer charge" @default.
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- W2789748959 doi "https://doi.org/10.1016/j.clay.2018.01.022" @default.
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