Controllable Preparation of Ultrathin Sandwich-Like Membrane with Porous Organic Framework and Graphene Oxide for Molecular Filtration

Abstract

Porous organic frameworks (POFs) based membranes have potential applications in molecular filtration, despite the lack of a corresponding study. This study reports an interesting strategy to get processable POFs dispersion and a novel ultrathin sandwich-like membrane design. It was accidentally found that the hydrophobic N-rich Schiff based POFs agglomerates could react with lithium-ethylamine and formed stable dispersion in water. By successively filtrating the obtained POFs dispersion and graphene oxide (GO), we successfully prepared ultrathin sandwich-like hybrid membranes with layered structure, which showed significantly improved separation efficiency in molecular filtration of organic dyes. This study may provide a universal way to the preparation of processable POFs and their hybrid membranes with GO.

Photo-Responsive Signatures in a Porous Organic Polymer Enable Visible Light-Driven CO2 Photofixation

“…The deconvoluted XPS spectra of C-1s in the core region (Figure b) revealed three binding energy peaks at ∼284.1, 284.9, and 288.5 eV, which can be assigned to the CC/C–C, C–N, and CN moieties in the polymeric framework. The N-1s deconvoluted spectra (Figure c) exhibited two distinct peaks at 398.5 and 399.46 eV, which corresponds to the imine-N and pyridinic-N atoms …”

“…The deconvoluted XPS spectra of C-1s in the core region (Figure 3b) revealed three binding energy peaks at ∼284.1, 284.9, and 288.5 eV, which can be assigned to the C�C/C−C, 43 C−N, 44 and C�N 45 moieties in the polymeric framework. The N-1s deconvoluted spectra (Figure 3c) exhibited two distinct peaks at 398.5 and 399.46 eV, which corresponds to the imine-N 46 and pyridinic-N atoms. 47 To assess the light-harvesting ability of the as-synthesized Py-POP, we conducted UV−vis diffuse reflectance spectroscopy (UV−vis DRS), photoluminescence (PL), and time-resolved photoluminescence (TRPL) analysis.…”