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Repeatability of Lithium Adsorption and Desorption on TiO2 Nanotubes from Brines

Safarzadeh, Amin | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53874 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Askari, Masoud
  7. Abstract:
  8. Today, recycling lithium as a valuable metal from brine plays an important role in various applications such as battery manufacturing, computers, aerospace and automobiles. Among the aqueous methods available for the extraction of the lithium element in brines, ion exchange by TiO2 nanosorbents is one of the most efficient methods. In this study, first the titanium dioxide nanotubes were well synthesized by anodizing method and the nanograss created after the anodizing process were completely eliminated. Then, the effect of three cathodes of aluminum, graphite and stainless steel in order to select the best cathode and achieve a regular morphology as well as their replacement with platinum was investigated, and finally stainless steel was selected as the optimal cathode. After chemical lithiation and calcination, X-ray diffraction test confirmed the formation of Li4Ti5O12 phase. Then, lithium ion was removed and hydrogen ions were replaced by acid washing at concentrations of 0.1 to 0.3 M HCl at 25 and 80 ° C. The amount of damage to the sample was studied using scanning electron microscope images and the amount of titanium in the solution. The results showed that by acid washing operation at a concentration of 0.2 M and a temperature of 80 ° C, a very good ionic nanosorbent is created to perform the process of adsorption of lithium from brines. In the following, the effect of immersion time on adsorption and desorption processes was investigated and the optimal time of 24 hours and 8 hours were obtained as optimal times, respectively, and the capacity and percentage of adsorption during 24 hours were 43.24 mg/g and 81.43٪ , respectively was obtained. Finally, by performing the test of reusability of the synthesized nano sieves, excellent efficiency in the process of lithium adsorption from brine was obtained
  9. Keywords:
  10. Lithium ; Desorption ; Adsorption ; Titanium Dioxide ; Brine ; Anodizing ; Repeatability Measure ; Titanium Oxide Nanotube

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