Polycrystalline Covalent Organic Framework Films Act as Adsorbents, Not Membranes.

@article{Fenton2021PolycrystallineCO,
  title={Polycrystalline Covalent Organic Framework Films Act as Adsorbents, Not Membranes.},
  author={Julie L. Fenton and David W. Burke and Dingwen Qian and M'onica Olvera de la Cruz and William R. Dichtel},
  journal={Journal of the American Chemical Society},
  year={2021}
}
Covalent organic framework (COF) membranes are of great promise for energy-efficient separations. Thick, polycrystalline COF films have been reported to separate dyes, salts, bacteria, and nanoparticles on the basis of size-selective transport through ordered pores. Here, we show that these materials function as adsorbents, not as size-sieving membranes. Binding isotherms of several dyes typical of the COF membrane literature to three COF powder samples illustrate that COFs are high-capacity… 

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