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Dual-imprinted mixed matrix membranes for selective recognition and separation: A synergetic imprinting strategy
Yilin Wu1, Rongxin Lin1, Faguang Ma1
1Institute of Green Chemistry and Chemical Technology, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China.
Journal of Colloid and Interface Science
|August 13, 2021
Summary
Graphene oxide/TiO2-loaded dual-imprinted membranes efficiently separate tetracycline (TC) from wastewater. These membranes overcome traditional separation limitations, offering high selectivity and stability for pollutant removal.
Area of Science:
- Materials Science
- Environmental Chemistry
- Separation Science
Background:
- Molecularly imprinted membranes (MIMs) are crucial for selective separation but often face permeability-selectivity trade-offs.
- Developing MIMs with enhanced recognition sites is essential for efficient pollutant removal in complex systems.
Purpose of the Study:
- To prepare graphene oxide (GO)/TiO2-loaded dual-imprinted mixed matrix membranes (GT-DIMs) for tetracycline (TC) separation.
- To evaluate the performance of GT-DIMs in overcoming the permeability-selectivity trade-off.
- To assess the efficiency of GT-DIMs in complex separation systems and simulated wastewater.
Main Methods:
- Synthesis of GO/TiO2-loaded nanocomposite fibrous membranes using polydopamine-based and sol-gel-based imprinting processes.
- Fabrication of dual-imprinted mixed matrix membranes (GT-DIMs) incorporating GO/TiO2 nanocomposite channels.
- Comparative analysis of membrane fluxes, rebinding capacities, and permselectivity.
Main Results:
- GT-DIMs exhibited a high rebinding capacity of 70.63 mg/g with fast adsorption equilibrium within 30 minutes.
- Achieved permselectivity factors around 5.0 for TC, demonstrating efficient selective recognition and separation.
- Demonstrated excellent structural stability and separation continuity for practical pollutant separation applications.
Conclusions:
- The developed GT-DIMs effectively break the permeability-selectivity trade-off for selective separation of TC.
- These membranes show significant potential for efficient and continuous removal of pollutants from wastewater.
- The dual-imprinted system offers a promising strategy for advanced separation technologies.
