Imogolite Synthesis at 25°C

Shin-Ichiro Wada
Department of Agricultural Chemistry, Kyushu University 46 Fukuoka 812, Japan

Abstract: Imogolite was synthesized at 25°C by aging partially neutralized solutions containing monomeric silicic acid and polymeric hydroxy-aluminum ions for 7 years. Solutions having an initial Si/Al molar ratio of about 0.5 and pHs of 4.0–4.5 produced the largest yields of imogolite, followed by those having an initial Si/Al ratio of about 1, although imogolite was not the principal product. Electron microscopic examination showed a small amount of imogolite fibers embedded in a noncrystalline gel-like substance. Traces of imogolite were detected in solutions having an initial Si/Al ratio of about 2, but no imogolite was found by electron microscopy in products from solutions having an initial Si/Al ratio of about 4. Only gibbsite formed from solutions having initial Si/Al ratios of <0.27. The diameter of the tubular structural unit of the imogolite produced in these experiments was 23 ± 2Å, close to that of natural imogolite.

Key Words: Fiber • Imogolite • Infrared spectroscopy • Synthesis • Transmission electron microscopy

Clays and Clay Minerals; October 1987 v. 35; no. 5; p. 379-384; DOI: 10.1346/CCMN.1987.0350508
© 1987, The Clay Minerals Society
Clay Minerals Society (www.clays.org)