Extraction of some strategic elements from thorium-uranium concentrate using bioproducts of Aspergillus ficuum and Pseudomonas aeruginosa

被引:40
作者
Desouky, Osman A. [1 ]
El-Mougith, Abdou A. [2 ]
Hassanien, Wesam A. [2 ]
Awadalla, Gamal S. [1 ]
Hussien, Shimaa S. [1 ,2 ]
机构
[1] Nucl Mat Author, POB 530, Cairo, Egypt
[2] Zagazig Univ, Dept Bot, Fac Sci, Zagazig, Egypt
关键词
Extraction; Thorium; Uranium; Rare earth elements; Aspergillus ficuum; Pseudomonas aeruginosa; Bioproducts;
D O I
10.1016/j.arabjc.2011.08.010
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The activity of the bioproducts from Aspergillus ficuum and Pseudomonas aeruginosa for extraction of thorium (Th4+), uranium (UO22+) and rare earth elements (REEs) from thoriumuranium concentrate was studied. P. aeruginosa produce element- specific ligand (siderophore) that is able to change pH and enhance chelation of Th4+ and UO22+. The produced siderophore at pH 5.3 has the ability to bioleach and is complexed with 68.00% of uranium and 65.00% of thorium. Also, A. ficuum produced different kinds of organic acids which leached 30.00% of uranium and 29.12% of thorium in addition to 20.00% of lanthanum, 33.00% of cerium and 2.51% of yttrium as rare earth elements at pH 3.0. Oxalic acid was efficient for Th4+, UO22+ and REEs precipitation. The binocular stereo-microscope (BSM), environmental scanning electron microscope (ESEM) and X-ray diffraction (XRD) analyses confirmed the percentages of extracted metals. Exogenous poly-saccharides (EPSs) seem to play an important role in bioleaching and removal of these elements. It was found that EPSs produced by A. ficuum adsorbed Th4+, UO22+ and REEs while that produced by P. aeruginosa adsorbed REEs only. (C) 2011 Production and hosting by Elsevier B.V. on behalf of King Saud University.
引用
收藏
页码:S795 / S805
页数:11
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