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Study on the structure-performance relationship between binder types and aluminum-based lithium adsorbent
Ben Ma1,2, Xiaoyu Wang1,2, Jing Zhou1,2
1School of Chemistry & Chemical Engineering, Linyi University, Linyi, China.
Frontiers in Chemistry
|October 13, 2025
Summary
Calcium alginate binder enhances aluminum lithium layered double hydroxide adsorbents for efficient lithium extraction from salt lakes. This granulated adsorbent maintains structural stability and superior adsorption/desorption performance across varying temperatures.
Area of Science:
- Materials Science
- Chemical Engineering
- Environmental Science
Background:
- Aluminum lithium layered double hydroxides (Li/Al-LDH) are cost-effective adsorbents with mild operating conditions.
- Powdered Li/Al-LDH suffers from poor fluidity and high dissolution rates, necessitating granulation.
- Systematic research on binder effects on granulated Li/Al-LDH performance is lacking.
Purpose of the Study:
- To investigate the structure-activity relationship between Li/Al-LDH and three binders: polyvinyl chloride (PVC), polyvinylidene fluoride (PVDF), and calcium alginate (SA).
- To evaluate the impact of binder type on adsorption/desorption efficiency, kinetics, and thermodynamics.
- To elucidate temperature-dependent adsorption/desorption mechanisms in granulated adsorbents for optimized lithium extraction.
Main Methods:
- Preparation and characterization of granulated Li/Al-LDH using PVC, PVDF, and SA binders.
- Adsorption and desorption experiments conducted at various temperatures in LiCl solutions.
- Analysis of structural stability, adsorption capacity, desorption capacity, and mass transfer mechanisms.
Main Results:
- Adsorption/desorption performance significantly varied with temperature and binder type.
- PVDF-LDH and PVC-LDH showed structural changes and decreased performance with temperature fluctuations.
- SA-LDH maintained structural integrity and excellent adsorption/desorption capabilities, with high capacities (e.g., 5.84 mg/g desorption at 40°C, 5.67 mg/g adsorption at 60°C in 300 ppm LiCl).
Conclusions:
- Calcium alginate is a superior binder for Li/Al-LDH granulation, ensuring structural stability and efficient lithium adsorption/desorption.
- Temperature plays a critical role in the performance of binder-formulated granulated adsorbents.
- SA-LDH offers a promising solution for industrial-scale lithium extraction from salt lakes, optimizing performance through binder selection and temperature control.
