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Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes
Published on: August 16, 2018
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Ingeniería interfacial en membranas de matriz mixta basadas en un marco metálico-orgánico utilizando cepillos de
Hongliang Wang1, Sanfeng He1, Xuedi Qin1
1School of Physical Science and Technology , ShanghaiTech University , Shanghai 201210 , China.
Journal of the American Chemical Society
|November 16, 2018
Resumen
El injerto de cepillos de poliimida en superficies de marco metálico-orgánico (MOF) crea membranas robustas para la separación de gases. Estas membranas MOF modificadas muestran un mayor rendimiento y ductilidad, incluso a altas cargas de MOF.
Área de la Ciencia:
- Ciencias de los materiales
- Ingeniería Química
- Ciencias de los Polímeros
Sus antecedentes:
- La compatibilidad interfacial es crucial para las membranas de matriz mixta (MMM) basadas en el marco metálico-orgánico (MOF) en la separación de gases.
- Los MMM tradicionales a menudo sufren de malas interacciones MOF-polímero, lo que limita su rendimiento.
Objetivo del estudio:
- Para diseñar la interfaz MOF-polímero utilizando cepillos de poliimida injertados covalentemente.
- Desarrollar MMM de alto rendimiento con mejores propiedades mecánicas y capacidades de separación de gases.
Principales métodos:
- Enjerto covalente de cepillos de poliimida en las superficies de MOF.
- Fabricación de membranas independientes con una alta carga de MOF (88% en peso) sin una matriz de polímero tradicional.
- Evaluación de la ductilidad de la membrana, la integridad de la interfaz y el rendimiento de separación de gases (CO2/N2, CO2/CH4).
Principales resultados:
- Las partículas de MOF injertadas con poliimida formaron membranas estables y independientes a una carga de MOF del 88% en peso.
- Las membranas modificadas mostraron una ductilidad significativamente mejorada (hasta el 472%) y un desgarro interfacial reducido.
- Se observó una mayor resistencia a la plastificación por CO2 y una disminución de la movilidad de la cadena de matriz.
- Se lograron aumentos simultáneos de la selectividad y la permeabilidad para las separaciones de CO2/N2 y CO2/CH4 con el aumento de la carga de MOF.
Conclusiones:
- Los cepillos de poliimida injertados covalentemente diseñan efectivamente la interfaz MOF-polímero, superando las limitaciones de los MMM tradicionales.
- Las membranas basadas en MOF desarrolladas ofrecen propiedades mecánicas superiores y un rendimiento excepcional de separación de gases.
- Este enfoque permite una alta carga de MOF manteniendo y mejorando la eficiencia de separación, alineándose con las predicciones teóricas.
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