Login / Signup

Hydrothermal synthesis and adsorption behavior of H 4 Ti 5 O 12 nanorods along [100] as lithium ion-sieves.

Bing ZhaoMin GuoFangren QianZhiqiang QianNaicai XuZhijian WuZhong Liu
Published in: RSC advances (2020)
The adsorption method is a promising route to recover Li + from waste lithium batteries and lithium-containing brines. To achieve this goal, it is vital to synthesize a stable and high adsorption capacity adsorbent. In this work, Li 4 Ti 5 O 12 nanorods are prepared by two hydrothermal processes followed by a calcination process. Then the prepared Li 4 Ti 5 O 12 nanorods are treated with different HCl concentrations to obtain a H 4 Ti 5 O 12 adsorbent with 5 μm length along the [100] direction. The maximum amount of extracted lithium can reach 90% and the extracted titanium only 2.5%. The batch adsorption experiments indicate that the H 4 Ti 5 O 12 nanorod maximum adsorption capacity can reach 23.20 mg g -1 in 24 mM LiCl solution. The adsorption isotherms and kinetics fit a Langmuir model and pseudo-second-order model, respectively. Meanwhile, the real adsorption selectivity experiments show that the maximum Li + adsorption capacity reaches 1.99 mmol g -1 , which is far higher than Mg 2+ (0.03 mmol g -1 ) and Ca 2+ (0.02 mmol g -1 ), implying these nanorods have higher adsorption selectivity for Li + from Lagoco Salt Lake brine. The adsorption capacity for Li + remains 91% after five cycles. With the help of XPS analyses, the adsorption mechanism of Li + on the H 4 Ti 5 O 12 nanorods is an ion exchange reaction. Therefore, this nanorod adsorbent has a potential application for Li + recovery from aqueous lithium resources.
Keyphrases
  • aqueous solution
  • solid state
  • ion batteries
  • gold nanoparticles
  • heavy metals
  • climate change
  • sewage sludge
  • newly diagnosed
  • solid phase extraction
  • structural basis