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Regulating lithium extraction based on intercalated SO42- in Li/Al-LDHs.
Jun Chen1, Hengfeng Yuan2, Jianguo Yu1
1National Engineering Research Center for Integrated Utilization of Salt Lake Resources, East China University of Science and Technology, Shanghai, China; State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai, China.
Journal of Colloid and Interface Science
|June 29, 2023
Summary
Constructing layered double hydroxides (LDHs) with sulfate anions improves lithium-ion adsorption and prevents lithium-ion desorption. This research offers insights into functional materials for ion adsorption and energy applications.
Area of Science:
- Materials Science
- Inorganic Chemistry
- Environmental Science
Background:
- Layered double hydroxides (LDHs) are crucial for ion adsorption and energy applications.
- Controlling interlayer anions in Lithium/Aluminum-LDHs (Li/Al-LDHs) is key to optimizing performance.
- Sulfate anions (SO4^2-) are of interest for intercalating and blocking lithium-ion (Li+) desorption.
Purpose of the Study:
- To investigate the anion exchange of chloride (Cl-) for sulfate (SO4^2-) in Li/Al-LDHs.
- To understand how intercalated SO4^2- affects the structure and adsorption properties of Li/Al-LDHs.
- To explore the impact of SO4^2- content on Li+ adsorption and desorption.
Main Methods:
- Anion exchange synthesis of Li/Al-LDHs with varying SO4^2- content.
- Characterization of structural changes using techniques like X-ray diffraction.
- Adsorption and desorption experiments to evaluate Li+ binding and release under different ionic strengths.
Main Results:
- Successful exchange of Cl- for SO4^2- in Li/Al-LDHs, leading to enlarged interlayer spacing and altered stacking.
- Fluctuating adsorption performance with increasing SO4^2- content due to structural changes and ionic strength effects.
- SO4^2- intercalation inhibited other anion intercalation and reduced Li+ adsorption, especially in high-ionic-strength brines.
- Enhanced electrostatic attraction between SO4^2- and LDHs hindered Li+ desorption.
- Additional Li+ was found essential for maintaining structural integrity with higher SO4^2- loading.
Conclusions:
- Sulfate intercalation in Li/Al-LDHs significantly impacts their structural and adsorption properties.
- The presence of SO4^2- can effectively block Li+ desorption through strong electrostatic interactions.
- Li/Al-LDHs with controlled SO4^2- content show potential for selective ion adsorption and energy storage applications.
- This study provides valuable insights for designing functional LDHs for environmental remediation and energy conversion.
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