Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 375, Issue -, Pages 78-85Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2019.04.059
Keywords
Hourglass crystal; Rhenium; Polyaminocarboxy; Reduction
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Funding
- National Natural Science Foundation of China [1157050811, U173210171, U1867205, 11475120]
- International Collaboration Project of Science and Technology Program of Sichuan Province, China [2017HH0056]
- Testing Center, College of Chemistry, Sichuan University
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This paper studied the fate of Re in the presence of polyaminocarboxy ligand (DTPA, EDTA and NTA) under reducing condition. When SnCl2 as reducing agent, the results indicated the low valent Re was formed. And batch experiments studied the effect of pH and different ligands on the formation of low valent Re complex, the acid condition was favoured for the formation of low valent Re complex, and the order of complexing toward the low valent Re was the following: DTPA > EDTA > NTA. In the condition of pH = 1, DTPA as ligand, the hourglass crystal was obtained. Using ESI-MS, solid-state UV-Vis-NIR spectra, EXAFS, DFT calculation et al, the darkened patch of the hourglass crystal was demonstrated to be Re, and its speciation was dimeric Re-2(mu-O)(2) DTPA.
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