Kinetic study of goethite dehydration and the effect of aluminium substitution on the dehydrate
Liu, Haibo , Chen, Tianhu, Xie, Qiaoqin, Zou, Xuehua, Qing, Chengsong, & Frost, Ray L. (2012) Kinetic study of goethite dehydration and the effect of aluminium substitution on the dehydrate. Thermochimica Acta, 545, pp. 20-25.
Goethite and Al-substituted goethite were synthesized and were characterized using XRD and XRF. The kinetic study of goethite dehydrate was investigated by TG and DTG at different heating rates (2, 5, 10, 15, 20 ◦C/min) and the effect of Al substitution for Fe on dehydrate was studied. The results showed that two types of absorbed water with the same Ed values of 3.4, 6.2 kJ/mol were confirmed on goethite and Alsubstituted goethite. Three types of hydroxyl units were proved, one being on the surface and the other two being in the structure of goethite. The substitution of Al for Fe in the structure of goethite decreases the desorption rate of hydroxyl, increases the dehydroxylation temperature, broadens the desorption peaks in DTG curves, and improves the Ed values from 19.4, 20.4, 26.1 kJ/mol to 21.6, 30, 33.6 kJ/mol when Al substitution comes to 9.1%.
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|Item Type:||Journal Article|
|Keywords:||Goethite, Al-substituted goethite, TG, DTG, Adsorption activation energy|
|Subjects:||Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Structural Chemistry and Spectroscopy (030606)|
|Divisions:||Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
|Copyright Owner:||© 2012 Elsevier B.V. All rights reserved|
|Deposited On:||13 Mar 2013 00:54|
|Last Modified:||13 Mar 2013 20:53|
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