AUGUST 28,2024

Preparation of hydrophilic modified ZIF-8 and its application in the preparation of nanocomposite matrix reverse osmosis membrane with improved permea

2024-08-28 08:43

Researchers found that the hydrophilic modification of ZIF-8 using tannic acid significantly improves water flux and salt rejection in nanocomposite reverse osmosis membranes.

The research demonstrates that the incorporation of tannic acid-modified ZIF-8 into the aqueous phase during interfacial polymerization enhances nanoparticle compatibility with the polyamide layer and increases membrane performance.
Source: Brera Design - adobe.stock.com — The research demonstrates that the incorporation of tannic acid-modified ZIF-8 into the aqueous phase during interfacial polymerization enhances nanoparticle compatibility with the polyamide layer and increases membrane performance. Source: Brera Design - adobe.stock.com

Metal–organic frameworks (MOFs) are widely employed in designing nanocomposite membranes owing to their excellent performance and diversity. However, their inherent hydrophobicity limits their application in nanocomposite membranes. In order to improve the hydrophilicity of zeolitic imidazolate framework-8 (ZIF-8), tannic acid (TA) was utilized to etch-modify it, resulting in a TA-ZIF-8 nanostructure with a hydrophilic shell. TA-ZIF-8 was subsequently introduced into the aqueous phase and used to prepare a nanocomposite matrix reverse osmosis membrane through interfacial polymerization (IP).

The prepared nanocomposite reverse osmosis membrane had a surface with good hydrophilicity and a pure water flux increased to 55.28 L m^-2 h^-1 (approximately 1.74 times). Additionally, the introduction of TA-ZIF-8 significantly enhanced the electronegativity of the membrane surface, and the nanoparticles were compatible with the polyamide layer, leading to a salt rejection rate of up to 99.5% for a NaCl solution with a concentration of 32000 ppm. These results indicate great potential for applying hydrophilically modified ZIF-8 to reverse osmosis membranes.

source：european-coatings

Journal of Coatings Technology and Research, Volume 21, pages 683–692, (2024)

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