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Capability of TiO2(B)-based Nanotubes to Adsorb Lithium Ion from Aqueous Solution

Shoghi, Ali | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52051 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Askari, Masoud; Alamolhoda, Ali Asghar
  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. 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. TiO2-based nanotubes are an appropriate option for adsorbing lithium from solution due to their high specific surface area and environmentally friendly process. Among titanium dioxide phases, TiO2-B is a suitable host for small ions such as lithium due to its low density. In this thesis, TiO2-B nanotubes were successfully synthesized via hydrothermal method. By using TiO2-B nanotubes, lithium titanate nanotubes with the desirable phase of Li4Ti5O12 were fabricated by hydrothermal method with 0.8 M LiOH aqueous solution. Then, lithium ion-sieve was prepared by acid pickling with 0.01 M HCl for 24 h. Phase and morphology characterization were determined using XRD and FESEM analyses. Adsorption experiments at different times and various lithium concentrations showed that equilibrium obtained after 24 h. Lithium Adsorption tests from solutions containing various concentrations showed that by increasing lithium concentration from 200 to 2000 mg/L, the adsorption capacity ranges from 34.3 to the significant amount of 160.6 mg/g. Lithium quantity in the solutions was measured by ICP test. Using the pseudo-first-order and pseudo-second-order kinetic models, it was found that the experimental results followed the pseudo-second-order kinetic model. Comparison of experimental results and Langmuir and Freundlich isotherm models indicated that experimental data are in good agreement with Freundlich adsorption isotherm. The study of Dubinin Radushkevich isotherm showed the lithium has been physically adsorbed onto ion-sieve. Furthermore, the BET surface area of ion-sieve was 115 m2/g
  9. Keywords:
  10. Ion Adsorption ; Titanium Oxide Beta Nanotube ; Lithium Titanate ; Kinetic Model ; Adsorption Isotherms ; Lithium

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