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Lithium Extraction with TiO2 Nanotube Synthesized by Anodizing Method

Taghvaei, Nastaran | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50635 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Askari, Masoud
  7. Abstract:
  8. Due to the technology advancement and the large-scale application of lithium-ion batteries in recent years, the market demand for lithium is growing rapidly and the availability of land lithium resources is decreasing significantly. As such, the focus of lithium extraction technologies has shifted to water lithium resources involving salt-lake brines and sea water. The ion exchange process is a promising method for lithium extraction from brine and seawater having low concentrations of this element. Among various aqueous recovery technologies, the lithium ion-sieve (LIS) technology is considered the most promising one. This is because LISs are excellent adsorbents with high lithium uptake capacity, superior lithium selectivity and good cycle performance. These attributes have enabled LISs to separate lithium effectively from aqueous solutions containing different ions. In this study, titanium dioxide and then lithium titanate spinel with nanotube morphology was synthesized via anodizing method followed by chemical lithiation in LiOH solution. The produced Li4Ti5O12 spinel ternary oxide nanotube with about 100 nm diameter was then treated with dilute acidic solution in order to prepare an adsorbent suitable for lithium adsorption from local brine. Morphological and phase analysis of the obtained nanostructured samples were done by using Field Emission Scanning Electron Microscopy along with X-ray diffraction. The results showed titanium dioxide adsorbent could recover 37.5 mg/g of the lithium present in 112 mg/L of lithium solution
  9. Keywords:
  10. Adsorption ; Ion Exchange ; Ion Sieve ; Anodizing ; Titanium Oxide ; Lithium ; Titanium Oxide Nanotube

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