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. 2021 Dec 10;9:810861. doi: 10.3389/fchem.2021.810861

FIGURE 2.

FIGURE 2

Scanning electron micrographs of the PI-ZIF nanofibers (A) PI and (B) ZIF-8-3/PI. (C) C, N, O, and Zn element distribution of ZIF-8/PI nanofibers. (D) X-ray diffraction patterns of the ZIF-8, PI, and ZIF-8-3/PI nanofiber membranes. (E) X-ray photoelectron spectroscopy images of the ZIF-8-3/PI nanofiber membranes.