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

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:385

Article

Liu, Haibo^1,2  Chen, Tianhu¹  Frost, Ray L.²  Chang, Dongyin¹  Qing, Chengsong¹  Xie, Qiaoqin¹ 

[1] Hefei Univ Technol, Sch Resource & Environm Engn, Hefei, Peoples R China

[2] Queensland Univ Technol, Sch Chem Phys & Mech Engn, Fac Sci & Engn, Brisbane, Qld 4001, Australia

关键词: Goethite;    Al substitution;    Morphology;    Aging time;    Unit cell dimension;   

DOI  :  10.1016/j.jcis.2012.07.016

来源: Elsevier

【 摘 要 】

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 angstrom and the b dimension decreases from 9.951 angstrom to 9.906 angstrom 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. (c) 2012 Elsevier Inc. All rights reserved.

【 授权许可】

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