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The water/salt transport properties of MOF/CTA mixed matrix membrane

Authors： YOU Meng, SUN Yuxiu, XU Fei, GAO Xin, MENG Jianqiang

Units： 1. State Key Laboratory of Separation Membranes and Membrane Process, Tiangong University, Tianjin 300389, China; 2. School of Materials Science and Engineering, Tiangong University, Tianjin 300389, China; 3. School of Chemistry and Chemical Engineering, Tiangong University, Tianjin 300389, China

KeyWords： Mixed matrix membrane; solution-diffusion theory; transport property; selectivity; reverse osmosis

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2021,41(3):77-88

Abstract：

Metal organic frameworks (MOFs) is one of the inorganic nanoparticles with regular pore structure and has recently drawn tremendous attention for the water treatment applications. One of the most successful applications is the fabrication of polyamide thin-film nanocomposite (TFN) membrane, which illustrated advantageous combination of water flux and salt rejection. However, the mechanisms of the improved desalination for TFN membrane are still unknown due to the anisotropy, uneven and very thin polyamide layer. We selected cellulose triacetate (CTA) as the base membrane and MOFs (UiO-66, MIL-101 and ZIF-8) as inorganic fillers to prepare the mixed matrix membranes for studying the effect of MOF on the water/salt transport properties based on the solution-diffusion theory. The addition of MOF increased the Tg and membrane density, which was due to the physical interaction between CTA chains and the MOF decreasing the flexibility of CTA chains. The MOFs destroyed the CTA chain packing and decreased its crystallinity. Compared to the CTA membrane, the adding of MOF showed small effect on the water and salt sorption, but greatly decreased the salt diffusivity and permeability, which was due to the membrane densification and interaction of salt ions with MOFs. As a result, the selectivity of the MOF/CTA increased. In all, the adding of MOF significantly increased the water/salt permeation selectivity by suppressing salt diffusion.

Funds：

国家自然科学基金（22075206, 21875162）

AuthorIntro：

尤蒙1990-），女，河北石家庄，博士生，从事反渗透膜以及聚合物膜传质机理研究，

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