Abstract
Covalent organic frameworks (COFs) exhibit potentials in adsorption, separation, heterogeneous catalysis, and energy storage due to low density, high thermal stability and inherent porosity. In this work, p-phenylenediamine (PDA) and 2,4,6-trihydroxy-benzene-1,3,5-tricarbaldehyde (TFP) were simultaneously evaporated onto modified poly(1,1-difluoroethylene) (PVDF) membrane in a chemical vapor deposition reactor to prepare COF-TpPa1 membranes for the separation of dyes. The effects of evaporation temperature, evaporation time, amount of Fe powder and pores size of PVDF membranes were studied, and the long-term operation was evaluated. The membranes showed an excellent water permeance (up to 400 L m−2 h−1 MPa−1) with high rejection (>90%) for different dyes (Mw 450–800), and low rejection (<8.2%) for salts. The COF-TpPa1 membrane also displayed considerable long-term operation stability. This facile approach can be extended to the preparation of a broad range of COFs membranes.
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