Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 5, Issue 4, Pages 3141-3147Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.6b02934
Keywords
Recovery of rare metal; Adsorption; Settling; Amino acid; Polyoxometalate; High-purity recycling
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Funding
- JSPS KAKENHI [26709061]
- Steel Foundation for Environmental Protection Technology
- Center for Functional Nano Oxide at Hiroshima University
- Grants-in-Aid for Scientific Research [26709061] Funding Source: KAKEN
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We present a facile method for tungsten ion removal using lysine for the development of an environmentally friendly and sustainable recycling technique. Lysine addition to the tungsten solution achieved 100% tungsten removal within 5 min, as a white lysine tungsten precipitate. Electrospray ionization mass spectrometry analyses of the tungsten and lysine mixed solutions showed that lysine promoted dehydration condensation reactions of anionic tungsten species such as HWO4- and W6O192- through the electrostatic interactions between positively charged lysine and negatively charged tungsten ions. Calcination of the lysine tungsten precipitate produced tungsten oxide powder of high purity (99.6%) because the lysine is completely decomposed. This facile and useful metal removal method can be used for polyoxometalates of other metals such as molybdenum, tantalum, and niobium.
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