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The difference of thermal stability between Fe-substituted palygorskite and Al-rich palygorskite

By Haibo Liu, Tianhu Chen, Dongyin Chang, Dong Chen, Chengsong Qing, Jingjing Xie and Ray L. Frost

Abstract

Sedimentary palygorskite (SP) and hydrothermal palygorskite (HP) were characterized by XRF, TG/DSC, andXRD. The total iron and dissociative iron in palygorskite were detected using spectrophotometry. The results showed that about 3.57 wt% of Fe2O3 was detected in SP in contrast with 0.4 wt% in HP. SP was a Fe-substituted palygorskite, and HP was an Al-rich palygorskite. The occurrence of Fe substitution in SP resulted in two mass loss steps of coordinated water and resulted in a larger d spacing. The SP showed greater thermal stability than the HP. It was proposed the change of (200) diffraction peak and (240) diffraction peak reflect changes of tetrahedral and octahedral structures in palygorskite

Topics: 030606 Structural Chemistry and Spectroscopy, Sedimentary palygorskite, Hydrothermal palygorskite, Thermostability, Fe substitution, Chemical component
Publisher: Springer Netherlands
Year: 2013
DOI identifier: 10.1007/s10973-012-2363-x
OAI identifier: oai:eprints.qut.edu.au:58752
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