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Lithium uptake in fixed-pH solution by ion sieves.

Lu Wang1, Chang Gong Meng, Mei Han

  • 1Chemistry Department, Dalian University of Technology, Dalian 116023, Liaoning, China.

Journal of Colloid and Interface Science
|July 1, 2008
PubMed
Summary
This summary is machine-generated.

This study investigated lithium (Li+) uptake using manganese oxide ion sieves. Sieve-2, with high hydrogen content and small grain size, is recommended for efficient lithium recovery from seawater and brine.

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Area of Science:

  • Materials Science
  • Environmental Chemistry
  • Electrochemistry

Background:

  • Lithium ion (Li+) recovery is crucial for sustainable energy technologies.
  • Ion sieves offer a promising approach for selective Li+ extraction from aqueous solutions.
  • Spinel-type manganese oxides are potential candidates for Li+ sorption due to their unique structural properties.

Purpose of the Study:

  • To evaluate Li+ uptake by two different spinel-type manganese oxide ion sieves.
  • To investigate the influence of ion sieve properties and ionic strength on Li+ sorption kinetics and thermodynamics.
  • To identify a suitable ion sieve for efficient lithium recovery from seawater and brine.

Main Methods:

  • Fixed-pH aqueous phase experiments at pH 8.0 using ammonia/ammonium chloride buffer.
  • Sorption isotherm studies to determine adsorption capacity and model fitting (Langmuir model).
  • Kinetic studies to analyze Li+ uptake rate (pseudo-second-order kinetics) and diffusion mechanisms.
  • Thermodynamic analysis (DeltaG(0), DeltaH(0), DeltaS(0)) to understand the energy changes during sorption.

Main Results:

  • Li+ uptake by both ion sieves followed Langmuir isotherms and pseudo-second-order kinetics.
  • The sorption process was endothermic, indicating energy input is required.
  • Ionic strength significantly affected the kinetics of Li+ uptake.
  • Sieve-2 demonstrated superior performance, attributed to its high hydrogen content and small grain size.

Conclusions:

  • Spinel-type manganese oxide ion sieves exhibit effective Li+ uptake capabilities.
  • Sieve-2 is a highly promising absorbent for industrial-scale lithium recovery from dilute sources like seawater and brine.
  • Understanding diffusion mechanisms (intraparticle vs. boundary layer) is key to optimizing ion sieve design for Li+ recovery.