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Influence of Citric Acid on the Formation of Short-Range Ordered Aluminosilicates

Published online by Cambridge University Press:  02 April 2024

K. Inoue  and
P. M. Huang
K. Inoue*
Affiliation:
Department of Soil Science, Saskatchewan Institute of Pedology, University of Saskatchewan, Saskatoon, Saskatchewan S7N 0W0, Canada
P. M. Huang
Affiliation:
Department of Soil Science, Saskatchewan Institute of Pedology, University of Saskatchewan, Saskatoon, Saskatchewan S7N 0W0, Canada
*
1Permanent address: Laboratory of Soil Science, Department of Agricultural Chemistry, Faculty of Agriculture, Iwate University, Morioka, Japan 020.
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Abstract

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Reactions between hydroxy-Al ions and orthosilicic acid as influenced by citric acid were studied at an initial Si concentration of 1.6 × 10−3 M, Si/Al molar ratios of 0.5 and 1.0, OH/Al molar ratios of 1.0-3.0, and citric acid/Al molar ratios of 0-0.3. In the absence of citric acid and at OH/A1 ratios of 1.0-2.8, imogolite (>0.01 μm) was dominant in the precipitates. At citric acid/Al ratios of 0.01-0.1, imogolite and/or pseudoboehmite were dominant in the precipitates at OH/Al ratios of 1.0 and 2.0, and imogolite and/or ill-defined aluminosilicate complexes at OH/Al ratio of 2.8. Instead of allophane or “proto-imogolite” allophane being the predominant species in the precipitates, the formation of ill-defined aluminosilicate complexes at OH/Al ratio of 3.0 was steadily promoted by increasing the solution citric acid/Al ratios from 0 to 0.3. The freeze-dried soluble products (<0.01 μ) ranged from silica gel to “proto-imogolite,” depending upon the basicity of Al and the level of citric acid of the parent solution. The amount of “proto-imogolite” increased with increasing citric acid/Al ratios from 0 to 0.1 in solution. Complexing low molecular weight organic acids, such as citric acid, impeded the formation of the short-range ordered aluminosilicates, allophanes and imogolite.

Keywords

AllophaneAluminosilicateCitric acidHydroxy-AlImogoliteNoncrystallinePseudoboehmite
Type
Research Article
Information
Clays and Clay Minerals , Volume 33 , Issue 4 , August 1985 , pp. 312 - 322
Copyright
Copyright © 1985, The Clay Minerals Society

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