Effect of aging time and Al substitution on the morphology of aluminous goethite

Liu, Haibo , Chen, Tianhu, Frost, Ray L., Chang, Dongyin, Qing, Chengsong, & Xie, Qiaoqin (2012) Effect of aging time and Al substitution on the morphology of aluminous goethite. Journal of Colloid and Interface Science, 385(1), pp. 81-86.

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Goethite and Al-substituted goethite were synthesized from the reaction between ferric nitrate and/or aluminum nitrate and potassium hydroxide. XRF, XRD, TEM with EDS were used to characterize the chemical composition, phase and lattice parameters, and morphology of the synthesized products. The results show that d(020) decreases from 4.953 to 4.949 Å and the b dimension decreases from 9.951 Å to 9.906 Å when the aging time increases from 6 days to 42 days for 9.09 mol% Al-substituted goethite. A sample with 9.09 mol% Al substitution in Al-substituted goethite was prepared by a rapid co-precipitation method. In the sample, 13.45 mol%, 12.31 mol% and 5.85 mol% Al substitution with a crystal size of 163, 131, and 45 nm are observed as shown in the TEM images and EDS. The crystal size of goethite is positively related to the degree of Al substitution according to the TEM images and EDS results. Thus, this methodology is proved to be effective to distinguish the morphology of goethite and Al substituted goethite.

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ID Code: 58130
Item Type: Journal Article
Refereed: Yes
Keywords: Goethite, Al substitution, Morphology, Aging time, Unit cell dimension
DOI: 10.1016/j.jcis.2012.07.016
ISSN: 0021-9797
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 Inc. All rights reserved.
Deposited On: 13 Mar 2013 00:41
Last Modified: 13 Mar 2013 00:41

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