fig1
![Post-modified porous aromatic frameworks for carbon dioxide capture](https://image.oaes.cc/ebd3cdf1-76b5-4921-9c8f-2ce51e5ce9a1/cs4028.fig.1.jpg)
Figure 1. Schematic diagram of the post-modification process. (A) The new post-modified method for PAF-1; (B) 13C CP/MAS NMR spectrum of PAF-1 and PAF-1-Cl; (C and D) XPS C 1s and Cl 2p spectrum of PAF-1 and PAF-1-Cl. PAF-1: Porous aromatic framework-1; CP/MAS: cross-polarization/magic angle spinning; NMR: nuclear magnetic resonance; XPS: X-ray photoelectron spectroscopy.