Abstract—
We have intercalated bentonite using one-step treatment with an ammonium heptamolybdate ((NH4)6Mo7O24 ⋅ 4Н2O) solution containing citric acid additions and a two-step process that includes exposure to dimethyl sulfoxide vapor in the first step. The d001 interplanar spacing of the bentonite increased from 16.2 to 21.8 Å in the former case and to 23 Å in the latter. The degree of ammonium heptamolybdate intercalation was then 36–40 wt %. Kaolin intercalation compounds, with d001 = 10.98 Å (2θ = 7.52°), were only obtained using the two-step process, because of the rigid connection between the structural slabs of kaolin. The degree of intercalation of the precursors into the kaolin structure was 17 wt %, and the intercalation compound was stable up to 220°C.
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This work was supported by the Belarusian Republican Foundation for Fundamental Research, agreement no. X 19-004.
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Translated by O. Tsarev
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Koshevar, V.D., Shkadretsova, V.G. Intercalation of Ammonium Heptamolybdate into Interlayer Spaces of Natural Aluminosilicates. Inorg Mater 57, 44–53 (2021). https://doi.org/10.1134/S0020168521010088
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DOI: https://doi.org/10.1134/S0020168521010088