Characterisation of the hydroxy-interlayered vermiculite from the weathering of illite in Jiujiang red earth sediments
Ke Yin A E , Hanlie Hong A B , Gordon Jock Churchman C , Zhaohui Li D , Wen Han A and Chaowen Wang A
+ Author Affiliations
- Author Affiliations
A Faculty of Earth Sciences, China University of Geosciences, Wuhan, Hubei, 430074, China.
B Key Laboratory of Geobiology and Environmental Geology, the Ministry of Education, China University of Geosciences, Wuhan, Hubei, 430074, China.
C School of Agriculture, Food and Wine, Waite Campus, The University of Adelaide, SA 5005, Australia.
D Geosciences Department, University of Wisconsin – Parkside, Kenosha, WI 53141-2000, USA.
E Corresponding author. Email: yinke1984@qq.com
Soil Research 52(6) 554-561 https://doi.org/10.1071/SR14014
Submitted: 16 January 2013 Accepted: 8 April 2014 Published: 14 August 2014
Abstract
The clay mineralogy and formation of hydroxy-interlayered vermiculite (HIV) in the Jiujiang red earth sediments were investigated using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC) and inductively coupled plasma-atomic emission spectrometer (ICP-AES) analyses. The 1.4-nm peak of HIV did not change after Mg2+ saturation and glycol solvation, but it exhibited partial collapse to 1.0 nm after K+ saturation followed by heat treatment at successively higher temperatures. HIV was also characterised by FTIR adsorption bands at ~3485 cm–1 and ~3415 cm–1, which did not change with increasing temperature. DSC analysis revealed that the dehydroxylation of hydroxides in the interlayer of HIV began at ~400°C, and a further dehydroxylation was confirmed by the XRD of the sample heated to ~600°C. The ICP-AES analysis of sodium citrate extracts showed that the Al concentration was higher than that of Fe, indicating that the Al was probably present as hydroxy-Al in the interlayer of HIV. The presence of hydroxy-Al polymers in the interlayer influenced both expandability and thermal properties of HIV clays from Jiujiang red earth sediments.
Additional keywords: climate, hydroxy-interlayered vermiculite, Jiujiang, mineralogy, red earth sediments.
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