Synthesis and characterisation of boron and gallium substituted saponite clays below 100 degrees Celsius and 1 atmosphere
Vogels, R.J.M.J., Kloprogge, J. Theo, & Geus, John W. (2005) Synthesis and characterisation of boron and gallium substituted saponite clays below 100 degrees Celsius and 1 atmosphere. Microporous and Mesoporous Materials, 77(2-3).
This paper describes a simple procedure for the synthesis of saponites with isomorphous substitution of Si4+ by B3+ and Ga3+ below 100°C and at 1 atmosphere. The XRD patterns of the Ga- and B-substituted saponites are similar to Al-substituted saponites. The 71Ga MAS-NMR spectra of Ga3+ containing Mg- and Zn-saponite show two broad peaks at approximately 25 and 180-195 ppm, attributed to Ga6 and Ga4, respectively. the dimensions of Mg-saponite particles are considerably smaller than those of Zn-saponites. The lateral dimensions of the platelets of B3+ containing Mg-saponites range between 40 and l00 nm, exhibiting hardly any stacking after 20 hours of synthesis, while the platelets of the Zn-saponites are 200 to 350 nm in length with some degree of stacking. B3+ containing Mg-saponite exhibits a broad double signal at 12.6 and 9.0 ppm of a low intensity together with a sharp peak at -0.8 ppm, presumably corresponding to BO3 and BO4, respectively. 29Si MAS-NMR on the B3+ containing saponites reveals two signals at approximately -85 due to Q2 Si(OB)and -96 ppm corresponding to Q3 Si(OB).
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|Item Type:||Journal Article|
|Additional Information:||Co-author R. Vogel is affiliated with Philips Lighting and co-author J.Geus is affiliated with Utrecht University.|
|Keywords:||boron, gallium, saponite, solid, state NMR, synthesis|
|Subjects:||Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > INORGANIC CHEMISTRY (030200)|
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Science and Technology|
|Copyright Owner:||Copyright 2005 Elsevier|
|Copyright Statement:||Reproduced in accordance with the copyright policy of the publisher: This journal is available online.|
|Deposited On:||13 Oct 2005 00:00|
|Last Modified:||09 Jun 2010 12:23|
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